Grundfos LCD 108 Installation And Operating Instructions Manual

LCD 108

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

2

Table of contents

3

LCD 108

English (GB)

Installation and operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Deutsch (DE)

Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Magyar (HU)

Telepítési és üzemeltetési utasítás . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Nederlands (NL)

Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Polski (PL)

Instrukcja montażu i eksploatacji . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Română (RO)

Instrucţiuni de instalare şi utilizare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Appendix 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Declaration of conformity 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

English (GB)

4

English (GB) Installation and operating instructions

Original installation and operating instructions.

CONTENTS

Page

1. Symbols used in this document

2. General

The LCD 108 controller is designed for the control of pumps in

wastewater systems.

Type key:

1. Symbols used in this document

4

2. General

4

2.1 Applications

5

2.2 Variants

5

3. Location and mounting

5

3.1 Location

5

3.2 Mounting of LCD 108 for direct-on-line starting

5

3.3 Mounting of LCD 108 for star-delta starting

6

4. Systems for parallel operation with 3 float switches

7

4.1 Electrical connection

7

4.2 Setting

8

4.3 Control panel

10

4.4 Battery back-up functions

10

4.5 Reset button and ON-OFF-AUTO selector switch

11

5. Systems for parallel operation with 4 float switches

12

5.1 Electrical connection

12

5.2 Setting

12

5.3 Control panel

14

5.4 Battery back-up functions

14

5.5 Reset button and ON-OFF-AUTO selector switch

15

6. Systems for 100 % standby operation

16

6.1 Electrical connection

16

6.2 Setting

16

6.3 Control panel

18

6.4 Battery back-up functions

18

6.5 Reset button and ON-OFF-AUTO selector switch

19

7. System for full-control operation

20

7.1 Electrical connection

20

7.2 Setting

20

7.3 Control panel

22

7.4 Battery back-up functions

22

7.5 Reset button and ON-OFF-AUTO selector switch

23

8. Start-up

24

9. Maintenance

24

10. Technical data

25

11. Fault finding chart

26

12. Disposal

26

Warning

Prior to installation, read these installation and

operating instructions. Installation and operation

must comply with local regulations and accepted

codes of good practice.

Warning

If these safety instructions are not observed,

it may result in personal injury.

Warning

If these instructions are not observed, it may lead

to electric shock with consequent risk of serious

personal injury or death.

Warning

These instructions must be observed for

explosion-proof pumps. We recommend that you

also follow these instructions for standard

pumps.

Caution

If these safety instructions are not observed,

it may result in malfunction or damage to the

equipment.

Note

Notes or instructions that make the job easier

and ensure safe operation.

Example LCD 108 400 3 23 SD

LCD = two-pump controller

108 = type designation

Phase voltage [V]

1 = single-phase

3 = three-phase

Maximum operating current per pump [A]

SD = Star-delta starting

English (GB)

5

2.1 Applications

The LCD 108 enables:

• control of two pumps based on signals from float switches,

• automatic pump changeover (even distribution of operating

hours on both pumps),

• selection of automatic test run during long periods of inactivity

(every 24 hours),

• battery back-up in case of mains supply failure (accessory for

certain variants),

• starting delay within the range from 0 to 255 sec. (random)

after returning from battery operation to mains operation

(resulting in an even mains load when several pumping

stations are started up at the same time),

• selection of automatic alarm resetting,

• selection of automatic restarting,

• setting of stop delays matching the actual operating

conditions,

• indication of liquid level,

• alarm indication of:

– inadmissibly high liquid level,

– overload (via motor protection relay),

– overtemperature (via PTC resistance or thermal switch in

motor),

– wrong phase sequence (only certain variants),

– mains supply failure (only certain variants),

– defective float switch.

As standard, the LCD 108 has one alarm output for common

alarm. Certain variants have an additional alarm output for

separate high-level alarm.

Furthermore, the controller incorporates a buzzer (only certain

variants).

2.2 Variants

The actual controller type, voltage variant, etc. are stated in the

type key on the nameplate situated on the side of the controller

cabinet.

The LCD 108 is available for either direct-on-line starting or

star-delta starting.

The LCD 108 can be connected and set to operation/control in

4 different ways, see sections 4. to 7.:

• Section 4. Systems for parallel operation with 3 float switches.

(Electrodes can also be used.)

• Section 5. Systems for parallel operation with 4 float switches.

(Electrodes can also be used.)

• Section 6. Systems for 100 % standby operation.

• Section 7. System for full-control operation.

3. Location and mounting

The installation must be carried out by authorized personnel in

accordance with local regulations.

3.1 Location

The LCD 108 can be mounted at ambient temperatures ranging

from -30 °C to +50 °C.

Enclosure class: IP65.

When installed outdoors, the LCD 108 must be placed in a

protective shed or cupboard.

The LCD 108 must not be exposed to direct sunlight.

3.2 Mounting of LCD 108 for direct-on-line starting

Before mounting, remove the transport protectors, if any, from

inside the cabinet.

Mount the LCD 108:

• on a plane wall surface,

• with the Pg cable entries pointing downwards

(additional Pg cable entries, if required, must be fitted in the

bottom plate of the cabinet),

• with four screws through the mounting holes in the back plate

of the cabinet, see fig. 1. The mounting holes must be bored

with a 4 mm bore. Fit the screws into the mounting holes and

tighten securely. Fit the plastic caps supplied with the

controller on the screws (IP65).

Warning

Before starting any work on pumps used to pump

liquids which could be constituted as being

hazardous to health, thorough cleaning/venting

of pumps, pits, etc. must be carried out

according to local regulations.

Before making any connections in the LCD 108 or

work on pumps, pits, etc., it must be ensured that

the electricity supply has been switched off and

that it cannot be accidentally switched on.

Warning

The LCD 108 controller and an EEx barrier, if

required, must not be installed in explosion

hazard areas.

Only float switches approved for use in explosion

hazard areas may be used. The float switches

must be connected via an EEx barrier, e.g.

Grundfos number 96440300.

English (GB)

6

Figure 1 shows the internal construction of the LCD 108 for

direct-on-line starting.

Fig. 1

Figure 2 shows the terminals listed under positions 2 and 3.

Fig. 2

Key to the symbols in figures 1 and 2:

3.3 Mounting of LCD 108 for star-delta starting

Before mounting, remove the transport protectors, if any, from

inside the cabinet.

Mount the LCD 108:

• on a plane wall surface,

• with the Pg cable entries pointing downwards

(additional Pg cable entries, if required, must be fitted in the

bottom plate of the cabinet),

• with four screws through the mounting holes in the back plate

of the cabinet or through the brackets supplied with the

controller, fig. 4. The mounting holes must be bored with a

4 mm bore. Fit the screws into the mounting holes and tighten

securely. Fit the plastic caps supplied with the controller on the

screws (IP65).

Figure 3 shows the internal construction of the LCD 108 for star-

delta starting.

Fig. 3

TM01 4383 0299TM01 4833 2308

Pos. Description

1 Module CU 212.

2

Terminal block for level inputs

(11-12, 21-22, 31-32, 41-42).

3

Terminal block with:

• input for the PTC resistance/thermal switch of the

motor (T11-T21, T12-T22),

• output for external alarm device for high-level alarm

(H-NC, H-COM, H-NO) (only certain variants),

• output for external alarm device for common alarm

(G-NC, G-COM, G-NO).

4

Motor protection relays, pumps 1 and 2 (contacts and

thermal relay fitted).

5 Terminal block for electricity supply.

6

Fuse holders for control circuit fuses (1 to 3 depending

on voltage/current variant).

7 Isolating transformer.

9 Pg cable entries.

10 Earth bar ( PE).

22

12

T21

T11

T22

T12

H-NOH-COM

H-NC

G-NO

G-COM

G-NC

21

11

32

42

31

41

Note

If the distance between the controller and pit

exceeds 20 metres, it is not advisable to use

electrodes as problems with the signal values

sent back to the controller may arise.

In such cases, it is recommended to use float

switches.

Note

Cables of up to 100 metres can be connected

between the controller and the float switches.

TM01 8125 5099

English (GB)

7

Fig. 4

Figure 5 shows the terminals listed under positions 2 and 3.

Fig. 5

Key to the symbols in figures 3 and 5:

4. Systems for parallel operation with 3 float

switches

Description (see also page 142 or 143):

The pumps are controlled by the liquid level in the pit.

• When the float switch, pos. 1, registers liquid, the first pump is

started.

• When the float switch, pos. 2, registers liquid, the next pump is

started.

• When the float switch, pos. 1, does not register any liquid, the

"stop delay" is initiated (can be set). After expiration of the

stop delay, both pumps are stopped.

• The pumps operate alternately.

The top float switch, pos. 3, activates the high-level alarm.

4.1 Electrical connection

Parallel operation with 3 float switches, pages 142 or 143.

Fig. 1 on page 142.

The figures show all electrical connections required to connect

the LCD 108 for direct-on-line starting, parallel operation with

3 float switches.

Fig. 2 on page 143.

The figure shows all electrical connections required to connect

the LCD 108 for star-delta starting, parallel operation with 3 float

switches.

The operating voltage and frequency are marked on the controller

nameplate. Make sure that the controller is suitable for the

electricity supply on which it will be used.

All cables/wires must be fitted through the Pg cable entries and

gaskets (IP65).

Maximum back-up fuse is stated on the controller nameplate.

If required according to local regulations, an external mains

switch must be installed.

TM01 8482 0300TM01 6869 2308

Pos. Description

1 Module CU 212.

2

Terminal block for level inputs

(11-12, 21-22, 31-32, 41-42).

3

Terminal block with:

• output for external alarm device for high-level alarm

(H-NC, H-COM, H-NO) (only certain variants),

• output for external alarm device for common alarm

(G-NC, G-COM, G-NO).

4

Contacts for star-delta starting and motor protection

relays (contacts, thermal relay fitted and timing relay).

5 Terminal block for electricity supply.

6

Fuse holders for control circuit fuses (2 or 3 depending

on voltage variant).

7 Isolating transformer.

8 Terminal block for the connection of pump 1 and 2.

9 Pg cable entries.

10 Earth bar ( PE).

11

Input for the PTC resistance/thermal switch of the motor

(T11-T21, T12-T22).

1211

22

32

42

21

31

41

G-NO

H-NO

G-COM

H-COM

G-NC

H-NC

Note

If the distance between the controller and pit

exceeds 20 metres, it is not advisable to use

electrodes as problems with the signal values

sent back to the controller may arise.

In such cases, it is recommended to use float

switches.

Note

Cables of up to 100 metres can be connected

between the controller and the float switches.

Warning

Before starting any work on pumps used to pump

liquids which could be constituted as being

hazardous to health, thorough cleaning/venting

of pumps, pits, etc. must be carried out

according to local regulations.

Before making any connections in the LCD 108 or

work on pumps, pits, etc., it must be ensured that

the electricity supply has been switched off and

that it cannot be accidentally switched on.

Warning

Before starting work on the system, switch off

the supply voltage and lock the mains switch in

position 0.

Any external voltage connected to the system

must be switched off before work is started.

Warning

The LCD 108 must be connected in accordance

with the rules and standards in force for the

application in question.

English (GB)

8

Single-phase motors must be connected to an external operating

capacitor and in certain cases also to a starting capacitor.

Further details can be found in the installation and operating

instructions for the pump in question.

The float switches must be connected as NO contacts, i.e. brown

and black leads, when float switches, Grundfos product number

96003332 or 96003695, are used.

Key to the symbols in fig. 1 on page 142 and fig. 2 on

page 143:

4.2 Setting

Parallel operation with 3 float switches, pages 142 and 143.

The module CU 212 has a 10-pole DIP switch in the bottom right

corner, see fig. 6.

The DIP switch setting offers the following possibilities:

• selection of starting delay and automatic test run (switch 4),

• setting of stop delay (switches 5, 6 and 7),

• selection of automatic alarm resetting (switch 9),

• selection of automatic restarting (switch 10).

Fig. 6

Set the DIP switch as shown in fig. 6.

Each individual switch (1 to 10) of the DIP switch can be set to

position OFF or ON.

Set the switches 1 to 10 as follows:

• Switches 1, 2 and 3, application type:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 4, starting delay and automatic test run (only in the

case of battery back-up):

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

Caution

If the PTC resistance/thermal switch of the motor

is connected, the factory-fitted short-circuit

jumper must be removed (terminals T11-T21,

T12-T22). For correct installation of PTC resistor/

thermal switch, see the installation and operating

instructions of the pump.

Warning

Float switches placed in an explosion hazard

area must be connected via an EEx barrier, e.g.

Grundfos number 96440300.

The EEx barrier must not be installed in the

explosion hazard area.

Equipment used in explosion hazard areas must

in each individual case have been approved for

this particular application. Furthermore, the

cables into the explosion hazard area must be

laid in accordance with local regulations.

Note

Float switches of the same type as Grundfos

product number 96003332 or 96003695, i.e.

float switches with gold-plated contacts suitable

for low voltages and currents (40 V / 100 mA),

must be used. All EEx-approved float switches

are also suitable.

Pos. Description

Terminal

number

1

Float switch for start of the first pump/

common stop.

11-12

2 Float switch for start of the next pump. 21-22

3 Float switch for high-level alarm. 31-32

Caution

During the setting of the DIP switch, the

controller must always be dead for at least

1 minute to achieve the correct configuration

during start-up after change of the DIP switch

setting.

TM016870 2308

Note

The DIP switch must not be set to other switch

combinations than those described in this

section.

This setting determines the actual application type

(parallel operation with 3 float switches, pages 142 and

143).

At this setting, the start-up is delayed within the range

from 0 to 255 sec. (random) after the electricity supply

has been switched on when the liquid level is

sufficiently high.

Automatic test run carried out every 24 hours.

After the electricity has been switched on, the pump will

start immediately when the liquid level is sufficiently

high.

No automatic test run.

English (GB)

9

• Switches 5, 6 and 7, stop delay:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 8:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 9, automatic alarm resetting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 10, automatic restarting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

AC/DC selector:

The AC/DC selector switch for electrodes and/or float switches is

placed as shown in fig. 7.

Fig. 7

The stop delay is the time from the stop signal is given until the

pump is stopped.

It must be ensured that the pump is not running dry.

0 sec. 60 sec.

15 sec. 90 sec.

30 sec. 120 sec.

45 sec. 180 sec.

Switch 8 has no function in connection with the actual

application (parallel operation with 3 float switches,

pages 142 and 143), but this setting must be

maintained!

This setting ensures automatic resetting of alarm

signals to external alarm devices and the built-in

buzzer. However, an alarm signal will only be reset if

the cause of the fault no longer exists.

At this setting, the alarm signal must be reset manually

by means of the reset button (the reset button is

described in section 4.5).

This setting enables automatic restarting after the PTC

resistance/thermal switch of the motor has cut out the

pump. Restarting will not be carried out until the motor

has cooled to normal temperature.

When the pumps connected are used in explosion

hazard areas, switch 10 must not be in this

position!

At this setting, the pump must be restarted manually after

the PTC resistance/thermal switch of the motor has cut

out the pump. To restart the pump, push the

ON-OFF-AUTO selector switch into position OFF for a

short period (the ON-OFF-AUTO selector switch is

described in section 4.5).

When the pumps connected are used in explosion

hazard areas, switch 10 must be in this position!

TM02 5747 3902

Operation with electrodes and

float switches:

Selector switch in position AC:

It is possible to connect 3

electrodes (1 as reference

electrode) and 2 float switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position AC:

It is possible to connect 4 float

switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position DC:

It is possible to connect 4 float

switches.

Cables of up to 100 metres can be

connected between the controller

and the float switches.

The controller transmits a 12 VDC

signal.

Note

If the distance between the controller and pit

exceeds 20 metres, it is not advisable to use

electrodes as problems with the signal values

sent back to the controller may arise.

In such cases, it is recommended to use float

switches.

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

12 VDC

0 V

AC

DC

G3 4

English (GB)

10

4.3 Control panel

Parallel operation with 3 float switches, pages 142 and 143.

Figure 8 shows the control panel of the CU 212 module.

Fig. 8

Key to the symbols in fig. 8:

4.4 Battery back-up functions

Parallel operation with 3 float switches, pages 142 and 143.

If a back-up battery for CU 212 (accessory for certain variants) is

installed, the following functions will be carried out if the normal

electricity supply to the LCD 108 fails (see also the illustrations

below):

• The common alarm is active, the red indicator light is on -

cannot be reset!

• If the external alarm device for common alarm is supplied from

an external power source, this device will be active - cannot be

reset by means of the reset button!

• The built-in buzzer (only certain variants) is activated - can be

reset by means of the reset button!

• If the liquid level in the pit rises above the level for high-level

alarm, the top orange indicator light will be flashing and the

second orange indicator light from the top will be permanently

on.

• If the starting delay function and automatic test run were

selected (switch 4 of the DIP switch), the start-up will be

delayed after the electricity supply has been switched on when

the liquid level is sufficiently high, see section 4.2.

The table below shows the situations which may occur if the

normal electricity supply to the LCD 108 fails and a back-up

battery is connected:

= the indicator light is off.

= the indicator light is on.

= the indicator light is flashing.

TM01 6397 3902

Pos. Description

1

Green indicator light for pump 1 and 2, indicating

starting delay (flashing) and pump operation

(permanently on).

2

Red indicator light for pump 1 and 2, indicating pump

fault.

Flashing: Fault in PTC resistor/thermal switch

On: Fault in motor-protective circuit breaker.

3

Red indicator light, indicating wrong phase sequence

(only certain variants and three-phase pumps only).

4 Red indicator light, indicating common alarm.

5

ON-OFF-AUTO selector switch for pump 1, three

positions, see section 4.5.

6

ON-OFF-AUTO selector switch for pump 2, three

positions, see section 4.5.

7

Reset button, push-button for manual resetting of alarm

signals to external alarm devices and the built-in buzzer

(only certain variants), see section 4.5.

8

Orange indicator light, which is activated by the float

switch for start of the first pump/common stop.

9

Orange indicator light, which is activated by the float

switch for start of the next pump.

10

and

11

Two orange indicator lights, which are activated by the

float switch for high-level alarm. In case of high-level

alarm, the top indicator light is flashing and the other is

permanently on.

12

Green indicator light, indicating that the electricity

supply has been switched on.

CU 212

21

1

2

1234

7

56

12

11

9

8

10

Mains supply failure:

• The common alarm is active.

The red indicator light is on.

• The green indicator light (electricity

supply switched on) is off.

Mains supply failure and high-level alarm:

• The common alarm is active.

The red indicator light is on.

• The top orange indicator light is

flashing.

• The second orange indicator light from

the top is on.

• The green indicator light (electricity

supply switched on) is off.

1

CU 212

2

CU 212

2

1

English (GB)

11

4.5 Reset button and ON-OFF-AUTO selector switch

Parallel operation with 3 float switches, pages 142 and 143.

The reset button is a push-button for manual resetting of alarm signals to external alarm devices and the built-in

buzzer (i.e. not for resetting of the alarm memory as this is reset by means of the ON-OFF-AUTO selector switch,

see position OFF ( )).

Even if the fault condition still exists, the external alarm devices and the built-in buzzer will be reset when the reset

button is pressed.

The ON-OFF-AUTO selector switch for each pump has three different positions:

ON ( ), top position:

• The pump will start when the selector switch is pushed into this position (unless the motor protection relay has cut

out the pump).

• If the PTC resistance/thermal switch of the motor registers overtemperature, the pump will not be switched off.

Note: It is the user’s responsibility to decide how long the pump is to run with this fault indication. Over a long

period, the pump will be damaged!

In explosion hazard areas, switch 10 of the DIP switch must be set as stated in section 4.2. Consequently, the

pump cannot be started when the PTC resistance/thermal switch of the motor registers overtemperature.

OFF ( ), middle position:

•The pump cannot start when the selector switch has been set to this position.

• The alarm memory is reset by pushing the selector switch into position OFF ( ). The alarm memory is the light

indication of a fault condition which has disappeared. If a fault condition still exists when the selector switch is

pushed into position ON ( ) or AUTO ( ), the alarm indication will be repeated immediately.

AUTO ( ), bottom position:

• The pump is controlled by the input signals from the float switches and the pump according to the selected DIP

switch setting.

• Alarm signals will automatically be reset. Switch 9 of the DIP switch can, however, be set to manual resetting

which is carried out by means of the reset button, see section 4.2.

• The pump will restart automatically when a given fault condition disappears. However, this is dependent on the

setting of switch 10 of the DIP switch, see section 4.2.

• When the pump starts automatically after a fault condition which has disappeared, the indicator light will continue

to show the fault condition (alarm memory) and the indication can only be removed by resetting the alarm memory,

see position OFF ( ).

21

English (GB)

12

5. Systems for parallel operation with 4 float

switches

Description (see also page 144 or 145):

The pumps are controlled by the liquid level in the pit.

• The float switch, pos. 2, starts the first pump.

• The float switch, pos. 3, starts the next pump.

• The float switch, pos. 1, stops both pumps after expiration of

the "stop delay" (can be set).

• The pumps operate alternately.

• The top float switch, pos. 4, activates the high-level alarm.

5.1 Electrical connection

Parallel operation with 4 float switches, pages 144 and 145.

Fig. 3 on page 144.

The figures show all electrical connections required to connect

the LCD 108 for direct-on-line starting, parallel operation with

4 float switches.

Fig. 4 on page 145.

The figure shows all electrical connections required to connect

the LCD 108 for star-delta starting, parallel operation with 4 float

switches.

The operating voltage and frequency are marked on the controller

nameplate. Make sure that the controller is suitable for the

electricity supply on which it will be used.

All cables/wires must be fitted through the Pg cable entries and

gaskets (IP65).

Maximum back-up fuse is stated on the controller nameplate.

If required according to local regulations, an external mains

switch must be installed.

Single-phase motors must be connected to an external operating

capacitor and in certain cases also to a starting capacitor.

Further details can be found in the installation and operating

instructions for the pump in question.

The float switches must be connected as NO contacts, i.e. brown

and black leads, when float switches, Grundfos product number

96003332 or 96003695, are used.

Key to the symbols in fig. 3 on page 144 and fig. 4 on

page 145:

5.2 Setting

Parallel operation with 4 float switches, pages 144 and 145.

The module CU 212 has a 10-pole DIP switch in the bottom right

corner, see fig. 9.

The DIP switch setting offers the following possibilities:

• selection of starting delay and automatic test run (switch 4),

• setting of stop delay (switches 5, 6 and 7),

• selection of automatic alarm resetting (switch 9),

• selection of automatic restarting (switch 10).

Fig. 9

Set the DIP switch as shown in fig. 9.

Each individual switch (1 to 10) of the DIP switch can be set to

position OFF or ON.

Warning

Before starting any work on pumps used to pump

liquids which could be constituted as being

hazardous to health, thorough cleaning/venting

of pumps, pits, etc. must be carried out

according to local regulations.

Before making any connections in the LCD 108 or

work on pumps, pits, etc., it must be ensured that

the electricity supply has been switched off and

that it cannot be accidentally switched on.

Warning

Before starting work on the system, switch off

the supply voltage and lock the mains switch in

position 0.

Any external voltage connected to the system

must be switched off before work is started.

Warning

The LCD 108 must be connected in accordance

with the rules and standards in force for the

application in question.

Caution

If the PTC resistance/thermal switch of the motor

is connected, the factory-fitted short-circuit

jumper must be removed (terminals T11-T21,

T12-T22). For correct installation of PTC resistor/

thermal switch, see the installation and operating

instructions of the pump.

Warning

Float switches placed in an explosion hazard

area must be connected via an EEx barrier, e.g.

Grundfos number 96440300.

The EEx barrier must not be installed in the

explosion hazard area.

Equipment used in explosion hazard areas must

in each individual case have been approved for

this particular application. Furthermore, the

cables into the explosion hazard area must be

laid in accordance with local regulations.

Note

Float switches of the same type as Grundfos

product number 96003332 or 96003695, i.e. float

switches with gold-plated contacts suitable for

low voltages and currents (40 V / 100 mA), must

be used. All EEx-approved float switches are also

suitable.

Pos. Description

Terminal

number

1 Float switch for common stop. 11-12

2 Float switch for start of the first pump. 21-22

3 Float switch for start of the next pump. 31-32

4 Float switch for high-level alarm. 41-42

Caution

The controller must be off circuit to ensure the

correct configuration during start-up after

change of the DIP switch setting.

TM04 2341 2308

English (GB)

13

Set the switches 1 to 10 as follows:

• Switches 1, 2 and 3, application type:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 4, starting delay and automatic test run (only in the

case of battery back-up):

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

• Switches 5, 6 and 7, stop delay:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 8:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 9, automatic alarm resetting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 10, automatic restarting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

AC/DC selector:

The AC/DC selector switch for electrodes and/or float switches is

placed as shown in fig. 10.

Fig. 10

Note

The DIP switch must not be set to other switch

combinations than those described in this

section.

This setting determines the actual application type

(parallel operation with 4 float switches, pages 144 and

145).

At this setting, the start-up is delayed within the range

from 0 to 255 sec. (random) after the electricity supply

has been switched on when the liquid level is

sufficiently high.

Automatic test run carried out every 24 hours.

After the electricity has been switched on, the pump will

start immediately when the liquid level is sufficiently

high.

No automatic test run.

The stop delay is the time from the stop signal is given until the

pump is stopped.

It must be ensured that the pump is not running dry.

0 sec. 60 sec.

15 sec. 90 sec.

30 sec. 120 sec.

45 sec. 180 sec.

Switch 8 has no function in connection with the actual

application (parallel operation with 4 float switches,

pages 144 and 145), but this setting must be

maintained!

This setting ensures automatic resetting of alarm

signals to external alarm devices and the built-in

buzzer. However, an alarm signal will only be reset if

the cause of the fault no longer exists.

At this setting, the alarm signal must be reset manually

by means of the reset button (the reset button is

described in section 5.5).

This setting enables automatic restarting after the PTC

resistance/thermal switch of the motor has cut out the

pump. Restarting will not be carried out until the motor

has cooled to normal temperature.

When the pumps connected are used in explosion

hazard areas, switch 10 must not be in this

position!

At this setting, the pump must be restarted manually after

the PTC resistance/thermal switch of the motor has cut

out the pump. To restart the pump, push the

ON-OFF-AUTO selector switch into position OFF for a

short period (the ON-OFF-AUTO selector switch is

described in section 5.5).

When the pumps connected are used in explosion

hazard areas, switch 10 must be in this position!

TM02 5747 3902

Operation with electrodes and

float switches:

Selector switch in position AC:

It is possible to connect 3

electrodes (1 as reference

electrode) and 2 float switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position AC:

It is possible to connect 4 float

switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position DC:

It is possible to connect 4 float

switches.

Cables of up to 100 metres can be

connected between the controller

and the float switches.

The controller transmits a 12 VDC

signal.

Note

If the distance between the controller and pit

exceeds 20 metres, it is not advisable to use

electrodes as problems with the signal values

sent back to the controller may arise.

In such cases, it is recommended to use float

switches.

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

12 VDC

0 V

AC

DC

G3 4

English (GB)

14

5.3 Control panel

Parallel operation with 4 float switches, pages 144 and 145.

Figure 11 shows the control panel of the CU 212 module.

Fig. 11

Key to the symbols in fig. 11:

5.4 Battery back-up functions

Parallel operation with 4 float switches, pages 144 and 145.

If a back-up battery for CU 212 (accessory for certain variants) is

installed, the following functions will be carried out if the normal

electricity supply to the LCD 108 fails (see also the illustrations

below):

• The common alarm is active, the red indicator light is on -

cannot be reset!

• If the external alarm device for common alarm is supplied from

an external power source, this device will be active - cannot be

reset by means of the reset button!

• The built-in buzzer (only certain variants) is activated - can be

reset by means of the reset button!

• If the liquid level in the pit rises above the level for high-level

alarm, the top orange indicator light will be flashing and the

second orange indicator light from the top will be permanently

on.

• If the starting delay function and automatic test run were

selected (switch 4 of the DIP switch), the start-up will be

delayed after the electricity supply has been switched on when

the liquid level is sufficiently high, see section 5.2.

The table below shows the situations which may occur if the

normal electricity supply to the LCD 108 fails and a back-up

battery is connected:

= the indicator light is off.

= the indicator light is on.

= the indicator light is flashing.

TM01 6397 3902

Pos. Description

1

Green indicator light for pump 1 and 2, indicating

starting delay (flashing) and pump operation

(permanently on).

2

Red indicator light for pump 1 and 2.

Flashing: Fault in PTC resistor/thermal switch

On: Fault in motor-protective circuit breaker.

3

Red indicator light, indicating wrong phase sequence

(only certain variants and three-phase pumps only).

4 Red indicator light, indicating common alarm.

5

ON-OFF-AUTO selector switch for pump 1, three

positions, see section 5.5.

6

ON-OFF-AUTO selector switch for pump 2, three

positions, see section 5.5.

7

Reset button, push-button for manual resetting of alarm

signals to external alarm devices and the built-in buzzer

(only certain variants), see section 5.5.

8

Orange indicator light, which is activated by the float

switch for common stop.

9

Orange indicator light, which is activated by the float

switch for start of the first pump.

10

Orange indicator light, which is activated by the float

switch for start of the next pump.

11

Orange indicator light, which is activated by the float

switch for high-level alarm. In case of high-level alarm,

the indicator light is flashing.

12

Green indicator light, indicating that the electricity

supply has been switched on.

CU 212

21

1

2

1234

7

56

12

11

9

8

10

Mains supply failure:

• The common alarm is active.

The red indicator light is on.

• The green indicator light (electricity

supply switched on) is off.

Mains supply failure and high-level alarm:

• The common alarm is active.

The red indicator light is on.

• The top orange indicator light is

flashing.

• The second orange indicator light from

the top is on.

• The green indicator light (electricity

supply switched on) is off.

1

CU 212

2

CU 212

2

1

English (GB)

15

5.5 Reset button and ON-OFF-AUTO selector switch

Parallel operation with 4 float switches, pages 144 and 145.

The reset button is a push-button for manual resetting of alarm signals to external alarm devices and the built-in

buzzer (i.e. not for resetting of the alarm memory as this is reset by means of the ON-OFF-AUTO selector switch,

see position OFF ( )).

Even if the fault condition still exists, the external alarm devices and the built-in buzzer will be reset when the reset

button is pressed.

The ON-OFF-AUTO selector switch for each pump has three different positions:

ON ( ), top position:

• The pump will start when the selector switch is pushed into this position (unless the motor protection relay has cut

out the pump).

• If the PTC resistance/thermal switch of the motor registers overtemperature, the pump will not be switched off.

Note: It is the user’s responsibility to decide how long the pump is to run with this fault indication. Over a long

period, the pump will be damaged!

In explosion hazard areas, switch 10 of the DIP switch must be set as stated in section 5.2. Consequently,

the pump cannot be started when the PTC resistance/thermal switch of the motor registers overtemperature.

OFF ( ), middle position:

•The pump cannot start when the selector switch has been set to this position.

• The alarm memory is reset by pushing the selector switch into position OFF ( ). The alarm memory is the light

indication of a fault condition which has disappeared. If a fault condition still exists when the selector switch is

pushed into position ON ( ) or AUTO ( ), the alarm indication will be repeated immediately.

AUTO ( ), bottom position:

• The pump is controlled by the input signals from the float switches and the pump according to the selected DIP

switch setting.

• Alarm signals will automatically be reset. Switch 9 of the DIP switch can, however, be set to manual resetting

which is carried out by means of the reset button, see section 5.2.

• The pump will restart automatically when a given fault condition disappears. However, this is dependent on the

setting of switch 10 of the DIP switch, see section 5.2.

• When the pump starts automatically after a fault condition which has disappeared, the indicator light will continue

to show the fault condition (alarm memory) and the indication can only be removed by resetting the alarm memory,

see position OFF ( ).

21

English (GB)

16

6. Systems for 100 % standby operation

Description (see also page 146 or 147):

The pumps are controlled by the liquid level in the pit.

• The float switch, pos. 2, starts the first pump.

• The float switch, pos. 4, starts the next pump.

• The float switch, pos. 1, stops both pumps after expiration of

the "stop delay" (can be set).

• The pumps operate alternately.

• The float switch, pos. 3, activates the high-level alarm.

6.1 Electrical connection

100 % standby operation, pages 146 and 147.

Fig. 5 on page 146.

The figures show all electrical connections required to connect

the LCD 108 for direct-on-line starting, 100 % standby operation.

Fig. 6 on page 147.

The figure shows all electrical connections required to connect

the LCD 108 for star-delta starting, 100 % standby operation.

The operating voltage and frequency are marked on the controller

nameplate. Make sure that the controller is suitable for the

electricity supply on which it will be used.

All cables/wires must be fitted through the Pg cable entries and

gaskets (IP65).

Maximum back-up fuse is stated on the controller nameplate.

If required according to local regulations, an external mains

switch must be installed.

Single-phase motors must be connected to an external operating

capacitor and in certain cases also to a starting capacitor.

Further details can be found in the installation and operating

instructions for the pump in question.

The float switches must be connected as NO contacts, i.e. brown

and black leads, when float switches, Grundfos product number

96003332 or 96003695, are used.

Key to the symbols in fig. 5 on page 146 and fig. 6 on

page 147:

6.2 Setting

100 % standby operation, pages 146 and 147.

The module CU 212 has a 10-pole DIP switch in the bottom right

corner, see fig. 12.

The DIP switch setting offers the following possibilities:

• selection of starting delay and automatic test run (switch 4),

• setting of stop delay (switches 5, 6 and 7),

• selection of automatic alarm resetting (switch 9),

• selection of automatic restarting (switch 10).

Fig. 12

Set the DIP switch as shown in fig. 12.

Each individual switch (1 to 10) of the DIP switch can be set to

position OFF or ON.

Warning

Before starting any work on pumps used to pump

liquids which could be constituted as being

hazardous to health, thorough cleaning/venting

of pumps, pits, etc. must be carried out

according to local regulations.

Before making any connections in the LCD 108 or

work on pumps, pits, etc., it must be ensured that

the electricity supply has been switched off and

that it cannot be accidentally switched on.

Warning

Before starting work on the system, switch off

the supply voltage and lock the mains switch in

position 0.

Any external voltage connected to the system

must be switched off before work is started.

Warning

The LCD 108 must be connected in accordance

with the rules and standards in force for the

application in question.

Caution

If the PTC resistance/thermal switch of the motor

is connected, the factory-fitted short-circuit

jumper must be removed (terminals T11-T21,

T12-T22). For correct installation of PTC resistor/

thermal switch, see the installation and operating

instructions of the pump.

Warning

Float switches placed in an explosion hazard

area must be connected via an EEx barrier, e.g.

Grundfos number 96440300.

The EEx barrier must not be installed in the

explosion hazard area.

Equipment used in explosion hazard areas must

in each individual case have been approved for

this particular application. Furthermore, the

cables into the explosion hazard area must be

laid in accordance with local regulations.

Note

Float switches of the same type as Grundfos

product number 96003332 or 96003695, i.e. float

switches with gold-plated contacts suitable for

low voltages and currents (40 V / 100 mA), must

be used. All EEx-approved float switches are also

suitable.

Pos. Description

Terminal

number

1 Float switch for common stop. 11-12

2 Float switch for start of the first pump. 21-22

3 Float switch for high-level alarm. 31-32

4 Float switch for start of the next pump. 41-42

Caution

The controller must be off circuit to ensure the

correct configuration during start-up after

change of the DIP switch setting.

TM04 2340 2308

English (GB)

17

Set the switches 1 to 10 as follows:

• Switches 1, 2 and 3, application type:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 4, starting delay and automatic test run (only in the

case of battery back-up):

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

• Switches 5, 6 and 7, stop delay:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 8:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 9, automatic alarm resetting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

•Switch 10, automatic restarting:

When the DIP switch setting is changed, the controller must

be switched off for at least 1 minute!

AC/DC selector:

The AC/DC selector switch for electrodes and/or float switches is

placed as shown in fig. 13.

Fig. 13

Note

The DIP switch must not be set to other switch

combinations than those described in this

section.

This setting determines the actual application type

(100 % standby operation, pages 146 and 147).

At this setting, the start-up is delayed within the range

from 0 to 255 sec. (random) after the electricity supply

has been switched on when the liquid level is

sufficiently high.

Automatic test run carried out every 24 hours.

After the electricity has been switched on, the pump will

start immediately when the liquid level is sufficiently

high.

No automatic test run.

The stop delay is the time from the stop signal is given until the

pump is stopped.

It must be ensured that the pump is not running dry.

0 sec. 60 sec.

15 sec. 90 sec.

30 sec. 120 sec.

45 sec. 180 sec.

Switch 8 has no function in connection with the actual

application (100 % standby operation, pages 146 and

147), but this setting must be maintained!

This setting ensures automatic resetting of alarm

signals to external alarm devices and the built-in

buzzer. However, an alarm signal will only be reset if

the cause of the fault no longer exists.

At this setting, the alarm signal must be reset manually

by means of the reset button (the reset button is

described in section 6.5).

This setting enables automatic restarting after the PTC

resistance/thermal switch of the motor has cut out the

pump. Restarting will not be carried out until the motor

has cooled to normal temperature.

When the pumps connected are used in explosion

hazard areas, switch 10 must not be in this

position!

At this setting, the pump must be restarted manually after

the PTC resistance/thermal switch of the motor has cut

out the pump. To restart the pump, push the

ON-OFF-AUTO selector switch into position OFF for a

short period (the ON-OFF-AUTO selector switch is

described in section 6.5).

When the pumps connected are used in explosion

hazard areas, switch 10 must be in this position!

TM02 5747 3902

Operation with electrodes and

float switches:

Selector switch in position AC:

It is possible to connect

3 electrodes (1 as reference

electrode) and 2 float switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position AC:

It is possible to connect 4 float

switches.

The controller transmits a 13 to

18 VAC signal.

Operation with float switches:

Selector switch in position DC:

It is possible to connect 4 float

switches.

Cables of up to 100 metres can be

connected between the controller

and the float switches.

The controller transmits a 12 VDC

signal.

Note

If the distance between the controller and pit

exceeds 20 metres, it is not advisable to use

electrodes as problems with the signal values

sent back to the controller may arise.

In such cases, it is recommended to use float

switches.

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

13-18 VAC

0 V

AC

DC

G3 4

AC 1 2

12 VDC

0 V

AC

DC

G3 4

English (GB)

18

6.3 Control panel

100 % standby operation, pages 146 and 147.

Figure 14 shows the control panel of the CU 212 module.

Fig. 14

Key to the symbols in fig. 14:

6.4 Battery back-up functions

100 % standby operation, pages 146 and 147.

If a back-up battery for CU 212 (accessory for certain variants) is

installed, the following functions will be carried out if the normal

electricity supply to the LCD 108 fails (see also the illustrations

below):

• The common alarm is active, the red indicator light is on -

cannot be reset!

• If the external alarm device for common alarm is supplied from

an external power source, this device will be active - cannot be

reset by means of the reset button!

• The built-in buzzer (only certain variants) is activated - can be

reset by means of the reset button!

• If the liquid level in the pit rises above the level for high-level

alarm, the second orange indicator light from the top will be

flashing. If the liquid level is higher than the level for start of

the next pump, the top orange indicator light will be

permanently on.

• If the starting delay function and automatic test run were

selected (switch 4 of the DIP switch), the start-up will be

delayed after the electricity supply has been switched on when

the liquid level is sufficiently high, see section 6.2.

The table below shows the situations which may occur if the

normal electricity supply to the LCD 108 fails and a back-up

battery is connected:

= the indicator light is off.

= the indicator light is on.

= the indicator light is flashing.

TM01 6397 3902

Pos. Description

1

Green indicator light for pump 1 and 2, indicating

starting delay (flashing) and pump operation

(permanently on).

2

Red indicator light for pump 1 and 2.

Flashing: Fault in PTC resistor/thermal switch

On: Fault in motor-protective circuit breaker.

3

Red indicator light, indicating wrong phase sequence

(only certain variants and three-phase pumps only).

4 Red indicator light, indicating common alarm.

5

ON-OFF-AUTO selector switch for pump 1, three

positions, see section 6.5.

6

ON-OFF-AUTO selector switch for pump 2, three

positions, see section 6.5.

7

Reset button, push-button for manual resetting of alarm

signals to external alarm devices and the built-in buzzer

(only certain variants), see section 6.5.

8

Orange indicator light, which is activated by the float

switch for common stop.

9

Orange indicator light, which is activated by the float

switch for start of the first pump.

10

Orange indicator light, which is activated by the float

switch for high-level alarm. In case of high-level alarm,

the indicator light is flashing.

11

Orange indicator light, which is activated by the float

switch for start of the next pump.

12

Green indicator light, indicating that the electricity

supply has been switched on.

CU 212

21

1

2

1234

7

56

12

11

9

8

10

Mains supply failure:

• The common alarm is active.

The red indicator light is on.

• The green indicator light (electricity

supply switched on) is off.

Mains supply failure and high-level alarm:

• The common alarm is active.

The red indicator light is on.

• The top orange indicator light is on.

• The second orange indicator light from

the top is flashing.

• The green indicator light (electricity

supply switched on) is off.

1

CU 212

2

CU 212

2

1

English (GB)

19

6.5 Reset button and ON-OFF-AUTO selector switch

100 % standby operation, pages 146 and 147.

The reset button is a push-button for manual resetting of alarm signals to external alarm devices and the built-in

buzzer (i.e. not for resetting of the alarm memory as this is reset by means of the ON-OFF-AUTO selector switch,

see position OFF ( )).

Even if the fault condition still exists, the external alarm devices and the built-in buzzer will be reset when the reset

button is pressed.

The ON-OFF-AUTO selector switch for each pump has three different positions:

ON ( ), top position:

• The pump will start when the selector switch is pushed into this position (unless the motor protection relay has cut

out the pump).

• If the PTC resistance/thermal switch of the motor registers overtemperature, the pump will not be switched off.

Note: It is the user’s responsibility to decide how long the pump is to run with this fault indication. Over a long

period, the pump will be damaged!

In explosion hazard areas, switch 10 of the DIP switch must be set as stated in section 6.2. Consequently, the

pump cannot be started when the PTC resistance/thermal switch of the motor registers overtemperature.

OFF ( ), middle position:

•The pump cannot start when the selector switch has been set to this position.

• The alarm memory is reset by pushing the selector switch into position OFF ( ). The alarm memory is the light

indication of a fault condition which has disappeared. If a fault condition still exists when the selector switch is

pushed into position ON ( ) or AUTO ( ), the alarm indication will be repeated immediately.

AUTO ( ), bottom position:

• The pump is controlled by the input signals from the float switches and the pump according to the selected DIP

switch setting.

• Alarm signals will automatically be reset. Switch 9 of the DIP switch can, however, be set to manual resetting

which is carried out by means of the reset button, see section 6.2.

• The pump will restart automatically when a given fault condition disappears. However, this is dependent on the

setting of switch 10 of the DIP switch, see section 6.2.

• When the pump starts automatically after a fault condition which has disappeared, the indicator light will continue

to show the fault condition (alarm memory) and the indication can only be removed by resetting the alarm memory,

see position OFF ( ).

21

English (GB)

20

7. System for full-control operation

Description (see also page 148 or 149):

The pumps are controlled by the liquid level in the pit.

• The float switch, pos. 3, starts the first pump.

• The float switch, pos. 4, starts the next pump.

• The float switch, pos. 2, stops the last pump but one and the

float switch, pos. 1, stops the last pump. It is possible to set a

"stop delay" which delays the stop of the pumps.

• The pumps operate alternately.

7.1 Electrical connection

Full-control operation, pages 148 and 149.

Fig. 7 on page 148.

The figures show all electrical connections required to connect

the LCD 108 for direct-on-line starting, full-control operation.

Fig. 8 on page 149.

The figure shows all electrical connections required to connect

the LCD 108 for star-delta starting, full-control operation.

The operating voltage and frequency are marked on the controller

nameplate. Make sure that the controller is suitable for the

electricity supply on which it will be used.

All cables/wires must be fitted through the Pg cable entries and

gaskets (IP65).

Maximum back-up fuse is stated on the controller nameplate.

If required according to local regulations, an external mains

switch must be installed.

Single-phase motors must be connected to an external operating

capacitor and in certain cases also to a starting capacitor.

Further details can be found in the installation and operating

instructions for the pump in question.

The float switches must be connected as NO contacts, i.e. brown

and black leads, when float switches, Grundfos product number

96003332 or 96003695, are used.

Key to the symbols in fig. 7 on page 148 and fig. 8 on

page 149:

7.2 Setting

Full-control operation, pages 148 and 149.

The module CU 212 has a 10-pole DIP switch in the bottom right

corner, see fig. 15.

The DIP switch setting offers the following possibilities:

• selection of starting delay and automatic test run (switch 4),

• setting of stop delay (switches 5, 6 and 7),

• selection of automatic alarm resetting (switch 9),

• selection of automatic restarting (switch 10).

Fig. 15

Set the DIP switch as shown in fig. 15.

Each individual switch (1 to 10) of the DIP switch can be set to

position OFF or ON.

Warning

Before starting any work on pumps used to pump

liquids which could be constituted as being

hazardous to health, thorough cleaning/venting

of pumps, pits, etc. must be carried out

according to local regulations.

Before making any connections in the LCD 108 or

work on pumps, pits, etc., it must be ensured that

the electricity supply has been switched off and

that it cannot be accidentally switched on.

Warning

Before starting work on the system, switch off

the supply voltage and lock the mains switch in

position 0.

Any external voltage connected to the system

must be switched off before work is started.

Warning

The LCD 108 must be connected in accordance

with the rules and standards in force for the

application in question.

Caution

If the PTC resistance/thermal switch of the motor

is connected, the factory-fitted short-circuit

jumper must be removed (terminals T11-T21,

T12-T22). For correct installation of PTC resistor/

thermal switch, see the installation and operating

instructions of the pump.

Warning

Float switches placed in an explosion hazard

area must be connected via an EEx barrier, e.g.

Grundfos number 96440300.

The EEx barrier must not be installed in the

explosion hazard area.

Equipment used in explosion hazard areas must

in each individual case have been approved for

this particular application. Furthermore, the

cables into the explosion hazard area must be

laid in accordance with local regulations.

Note

Float switches of the same type as Grundfos

product number 96003332 or 96003695, i.e. float

switches with gold-plated contacts suitable for

low voltages and currents (40 V / 100 mA), must

be used. All EEx-approved float switches are also

suitable.

Pos. Description

Terminal

number

1 Float switch for stop of the last pump. 11-12

2

Float switch for stop of the last pump but

one.

21-22

3 Float switch for start of the first pump. 31-32

4 Float switch for start of the next pump. 41-42

Caution

The controller must be off circuit to ensure the

correct configuration during start-up after

change of the DIP switch setting.

TM04 2342 2308

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Grundfos LCD 108 Installation And Operating Instructions Manual

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