Grundfos CMBE User manual

CMBE
With drinking-water approved tank
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

CMBE
English (GB)
Installation and operating instructions ..................................4
Deutsch (DE)
Montage- und Betriebsanleitung .....................................24
Français (FR)
Notice d'installation et de fonctionnement...............................45
Italiano (IT)
Istruzioni di installazione e funzionamento ..............................65
Nederlands (NL)
Installatie- en bedieningsinstructies ...................................85
EU declaration of conformity .....................................105
UK declaration of conformity.....................................108
3
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 5
1.1 Hazard statements .............. 5
1.2 Notes ..................... 5
2. Safety instructions ............. 6
3. Product introduction ............ 8
3.1 Intended use ................. 8
3.2 Pumped liquids ................ 9
3.3 System sizing ................. 9
4. Mechanical installation ........... 9
4.1 Mounting the tank ............... 9
4.2 Adjusting the diaphragm tank pressure . ..10
4.3 Installation altitude ..............10
5. Electrical connection ............10
5.1 Cable requirements ..............11
5.2 Standard functional module, FM 200.....11
6. Startup ....................15
6.1 Flushing the system..............15
6.2 Supplement to quick guide ..........15
6.3 Priming and venting the product .......15
6.4 Starting up the booster system ........16
6.5 Shaft seal run-in................16
7. Control functions ..............16
7.1 Constant pressure ..............16
7.2 Dry-running protection ............16
7.3 Inlet pressure protection ...........17
8. Setting the product .............18
8.1 Operating panel ................18
8.2 Setpoint setting ................18
8.3 Start/stop of pump ..............18
8.4 Resetting of fault indications .........18
9. Servicing the product ............19
9.1 Cable requirements ..............19
9.2 Megging ....................19
10. Taking the product out of operation ....19
11. Fault finding .................20
11.1 Pump is not running..............20
11.2 Pump is not running..............20
11.3 Pump performance is unstable ........21
11.4 Pump runs backwards when switched off ..21
12. Technical data ................22
12.1 Operating conditions .............22
12.2 Supply voltage ................22
12.3 Overload protection ..............22
12.4 Cable requirements ..............22
13. Further product information ........23
14. Disposing of the product ..........23
15. Document quality feedback ........23
4
English (GB)

1. General information
This appliance can be used by children
aged from 8 years and above and persons
with reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they have been given
supervision or instruction concerning use
of the appliance in a safe way and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not
be made by children without supervision.
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
DANGER
Indicates a hazardous situation which, if
not avoided, will result in death or serious
personal injury.
WARNING
Indicates a hazardous situation which, if
not avoided, could result in death or
serious personal injury.
CAUTION
Indicates a hazardous situation which, if
not avoided, could result in minor or
moderate personal injury.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
Observe these instructions for explosion-
proof products.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
A red or grey circle with a diagonal bar,
possibly with a black graphical symbol,
indicates that an action must not be taken
or must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
5
English (GB)

2. Safety instructions
Mechanical installation
DANGER
Electric shock
Death or serious personal injury
‐In case of an insulation fault, the fault
current may be a DC or pulsating DC.
Observe national legislation about
requirements for and selection of
Residual Current Device (RCD) when
installing the product.
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Hot liquid
Death or serious personal injury
‐To avoid leakage do not overtighten
the pipe connections.
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐Wear safety shoes when moving the
product.
‐Use lifting equipment.
CAUTION
Back injury
Minor or moderate personal injury
‐Use lifting equipment.
Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐In case of an insulation fault, the fault
current may be a DC or pulsating
DC.Observe national legislation about
requirements for and selection of
Residual Current Device (RCD) when
installing the product.
WARNING
Electric shock
Death or serious personal injury
‐Carry out the electrical connection in
accordance with local regulations.
WARNING
Electric shock
Death or serious personal injury
‐Check that the power plug delivered
with the product is in compliance with
local regulations.
‐The protective earth of the power outlet
must be connected to the protective
earth of the product. The plug must
therefore have the same PE
connection system as the power outlet.
If not, use a suitable adapter if allowed
by local regulations.
‐Provide protection against indirect
contact in accordance with local
regulations.
‐Make sure all earth connections are
established correctly before switching
on the power supply.
‐The user or the installer is responsible
for correct earthing and protection
according to local regulations.
‐The installer is responsible for potential
compensation.
‐Work must be carried out according
to IEC 60204-1:2016.
WARNING
Electric shock
Death or serious personal injury
‐A supply disconnecting device made
according to EN 60204-1 5.3.2 must be
provided with means permitting it to be
locked in the OFF (isolated) position.
This device must also be installed in a
position according to EN 60204-1,
5.3.4.
WARNING
Electric shock
Death or serious personal injury
‐Power cables without a plug must be
connected to a supply disconnecting
device incorporated in the fixed wiring
according to local regulations.
Cable requirements
6
English (GB)

WARNING
Electric shock
Death or serious personal injury
‐Comply with local regulations as to
cable cross-sections.
Connection terminals for inputs and outputs
DANGER
Electric shock
Death or serious personal injury
‐Make sure that the wires to be
connected to the connection groups
below are separated from each other
by reinforced insulation in their entire
lengths.
Startup
WARNING
Hot liquid
Death or serious personal injury
‐If the temperature is higher than 50 °C,
use gloves and glasses when venting
the pump to avoid risk of scalding.
WARNING
Biological hazard
Death or serious personal injury
‐Flush the pump with clean water
before first use.
Flushing the system
DANGER
Contaminated drinking water
Death or serious personal injury
‐Flush the system before starting it or
after a standstill period.
Servicing the product
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply to the
product including the power supply for
the signal relays. Wait at least 5
minutes before you make any
connections in the terminal box.Make
sure that the power supply cannot be
switched on accidentally.
DANGER
Magnetic field
Death or serious personal injury
‐Persons with pacemaker must not
handle the motor or rotor.
WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
WARNING
Biological hazard
Death or serious personal injury
‐When servicing the product, only use
Grundfos original spare parts.
Cable requirements
WARNING
Electric shock
Death or serious personal injury
‐Comply with local regulations as to
cable cross-sections.
Taking the product out of operation
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
Fault finding
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
7
English (GB)

WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
WARNING
Biological hazard
Death or serious personal injury
‐When servicing the product, only use
Grundfos original spare parts.
Cable requirements
DANGER
Electric shock
Death or serious personal injury
‐Comply with local regulations as to
cable cross-sections.
‐Use the recommended fuse size.
3. Product introduction
TM084222
CMBE is a high-efficiency compact booster suitable
for clean water supply and pressure boosting in
domestic and light commercial applications. It
keeps a constant pressure via the integrated speed
control.
3.1 Intended use
The product has been evaluated for use in indoor
installations with:
• clean water
• drinking water.
Only use the product according to the
specifications stated in these installation
and operating instructions.
Check local regulations.
8
English (GB)

3.2 Pumped liquids
The product is suitable for pumping clean, thin, non-
aggressive, non-toxic and non-explosive liquids
without solid particles or fibres.
If the water contains sand, gravel or other
debris, there is a risk of pump blockage
and pump damage.
Please install a filter on the inlet side or
apply a floating strainer to protect the
pump.
3.3 System sizing
The system in which the CME Booster is
incorporated must be designed for the
maximum pump pressure.
The pump is by default set to not stop until it reaches
its maximum pressure.
4. Mechanical installation
DANGER
Electric shock
Death or serious personal injury
‐In case of an insulation fault, the fault
current may be a DC or pulsating DC.
Observe national legislation about
requirements for and selection of
Residual Current Device (RCD) when
installing the product.
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Hot liquid
Death or serious personal injury
‐To avoid leakage do not overtighten
the pipe connections.
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐Wear safety shoes when moving the
product.
‐Use lifting equipment.
CAUTION
Back injury
Minor or moderate personal injury
‐Use lifting equipment.
4.1 Mounting the tank
1. Apply drinking-water approved sealant tape to the
thread of the tank.
2. Screw the tank on the pump.
3. Check the system for leakages.
4. Check the precharge pressure.
Related information
4.2 Adjusting the diaphragm tank pressure
9
English (GB)

4.2 Adjusting the diaphragm tank pressure
1. Check the precharge pressure in the diaphragm
tank. The correct precharge pressure is 0.7 times
the required outlet pressure (setpoint).
Measure the precharge pressure while
the system is pressureless.
2. Adjust the precharge pressure. Always use
nitrogen gas to refill the tanks.
Related information
4.1 Mounting the tank
9. Servicing the product
4.3 Installation altitude
The installation altitude is the height above sea level
of the installation site.
• Products installed up to 1000 m above sea level
can be loaded 100 %.
• The motors can be installed up to 3500 m above
sea level.
Motors installed more than 1000 m above
sea level must not be fully loaded due to
the low density and consequent low
cooling effect of the air.
The motor output power (P2) in relation to the altitude
above sea level is shown in the graph below.
0
60
80
90
70
100
500 1000 1500 2000 2500 3000 3500 X
P2 [%]
TM055243
Derating of motor output (P2) in relation to altitude
above sea level
Pos. Description
x Altitude [m]
Related information
12.1.4 Ambient temperature during operation
5. Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐In case of an insulation fault, the fault
current may be a DC or pulsating
DC.Observe national legislation about
requirements for and selection of
Residual Current Device (RCD) when
installing the product.
WARNING
Electric shock
Death or serious personal injury
‐Carry out the electrical connection in
accordance with local regulations.
WARNING
Electric shock
Death or serious personal injury
‐Check that the power plug delivered
with the product is in compliance with
local regulations.
‐The protective earth of the power outlet
must be connected to the protective
earth of the product. The plug must
therefore have the same PE
connection system as the power outlet.
If not, use a suitable adapter if allowed
by local regulations.
‐Provide protection against indirect
contact in accordance with local
regulations.
‐Make sure all earth connections are
established correctly before switching
on the power supply.
‐The user or the installer is responsible
for correct earthing and protection
according to local regulations.
‐The installer is responsible for potential
compensation.
‐Work must be carried out according
to IEC 60204-1:2016.
WARNING
Electric shock
Death or serious personal injury
‐A supply disconnecting device made
according to EN 60204-1 5.3.2 must be
provided with means permitting it to be
locked in the OFF (isolated) position.
This device must also be installed in a
position according to EN 60204-1,
5.3.4.
10
English (GB)

WARNING
Electric shock
Death or serious personal injury
‐Power cables without a plug must be
connected to a supply disconnecting
device incorporated in the fixed wiring
according to local regulations.
Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
5.1 Cable requirements
WARNING
Electric shock
Death or serious personal injury
‐Comply with local regulations as to
cable cross-sections.
5.1.1 Motor protection
The pump requires no external motor protection. The
motor incorporates thermal protection against slow
overloading and blocking, TP 211 according to IEC
34-11.
5.1.2 Protection against mains voltage transients
The pump is protected against voltage transients by
built-in varistors between the phases and between
phases and earth.
5.2 Standard functional module, FM 200
5.2.1 Inputs and outputs
The module has these connections:
• two analog inputs
• two digital inputs or one digital input and one
open-collector output
• Grundfos Digital Sensor input and output
• two signal relay outputs
• GENIbus connection.
All inputs and outputs are internally separated from
the mains-conducting parts by reinforced insulation
and galvanically separated from other circuits. All
control terminals are supplied with protective extra-
low voltage (PELV), ensuring protection against
electric shock.
5.2.2 Signal relay 1
LIVE: You can connect supply voltages up to 250
VAC to the output.
PELV: The output is galvanically separated from other
circuits. Therefore, you can connect the supply
voltage or protective extra-low voltage to the output
as desired.
5.2.3 Signal relay 2
PELV: The output is galvanically separated from other
circuits. Therefore, you can connect the supply
voltage or protective extra-low voltage to the output
as desired.
5.2.4 Connection terminals for the mains supply
Phases Terminals
Single-phase N, PE, L
N
L
PE
TM053494
11
English (GB)

5.2.5 Connection terminals for inputs and outputs
DANGER
Electric shock
Death or serious personal injury
‐Make sure that the wires to be connected to the connection groups below are separated from
each other by reinforced insulation in their entire lengths.
3
15
8
26
23
25
24
7
B
Y
6
5
2
4
10
A
AI2
GDS RX
GDS TX
GND
GENIbus A
GENIbus B
+5 V
+24 V
+24 V
GND
GENIbus Y
GND
+5 V
DI1
AI1
DI3/OC1
+24 V*
+
+
+24 V*/5 V*
+24 V*
+5 V*
NC
C2
NO
NC
C1
NO
+24 V*
++
+24 V*/5 V*
+24 V*
+24 V*OC DI
GND
TM053510
Connection terminals, FM 200
* If you use an external supply source, there must be a connection to GND.
12
English (GB)

Connection terminals for inputs and outputs, FM 200. See the figure above.
Terminal Type Function
NC Normally closed contact
Signal relay 1 (LIVE or PELV)C1 Common
NO Normally open contact
NC Normally closed contact
Signal relay 2 (PELV only)C2 Common
NO Normally open contact
10 DI3/OC1 Digital input/output, configurable.
Open collector: Maximum 24 V resistive or inductive.
4 AI1
External sensor.
Pressure sensor: Pressure signal, 0.5 to 3.5
V. Connect the white wire to this terminal.
2 DI1
Digital input, configurable.
Digital input 1 is factory-set to be start or stop
input where an open circuit results in stop. A
jumper has been factory-fitted between
terminals 2 and 6. Remove the jumper if
digital input 1 is to be used as external start or
stop or any other external function.
5 +5 V Power supply to a potentiometer or sensor
6 GND Protective earth
A GENIbus, A GENIbus, A (+)
Y GENIbus, Y GENIbus, Y (GND)
B GENIbus, B GENIbus, B (-)
3 GND Protective earth
15 +24 V Power supply
8 +24 V Power supply
26 +5 V
Power supply to a potentiometer or sensor.
Pressure sensor: Voltage supply, +5 VDC,
PELV. Connect the brown wire to this terminal.
13
English (GB)

Terminal Type Function
23 GND
Protective earth.
Pressure sensor: GND, 0 V. Connect the
green wire to this terminal.
25 GDS TX Grundfos Digital Sensor output
24 GDS RX Grundfos Digital Sensor input
7 AI2
External sensor.
Pressure sensor: Temperature signal, 0.5 to
3.5 V. Connect the yellow wire to this terminal.
14
English (GB)

6. Startup
WARNING
Hot liquid
Death or serious personal injury
‐If the temperature is higher than 50 °C,
use gloves and glasses when venting
the pump to avoid risk of scalding.
WARNING
Biological hazard
Death or serious personal injury
‐Flush the pump with clean water
before first use.
Do not start the pump until it has been
filled with liquid.
Do not start the booster system until all
pumps have been properly primed.
After starting up the pump, check the
system for leakages.
6.1 Flushing the system
DANGER
Contaminated drinking water
Death or serious personal injury
‐Flush the system before starting it or
after a standstill period.
Drinking water systems
Hygiene
Grundfos pressure booster systems are functionally
tested by running water through the system. During
the test, Grundfos continuously surveys the quality of
the test water. Since it is not possible to completely
drain and dry the system after the test, the system
must be rinsed or flushed thoroughly before being
taken into use in a drinking water sector due to risk of
bacteria growth. This also applies if the system has
been shut down for a long period of time. Rinsing and
flushing must always be done in accordance with
local regulations.
Contaminated drinking water endangers health.
6.2 Supplement to quick guide
These instructions are a supplement to the quick
guide for CMBE and CMBE TWIN.
QR98388184
http://net.grundfos.com/qr/i/98388184
6.3 Priming and venting the product
1. Close the isolating valve on the outlet side.
2. Open the isolating valve on the inlet side.
3. Remove the priming plug.
4. Fill the pump with water until a steady stream of
liquid runs out of the filling hole.
5. Let all air out of the system.
6. Fit and tighten the priming plug.
15
English (GB)

6.4 Starting up the booster system
1. Open all isolating valves.
2. Make sure that the water supply is sufficient on
the inlet side of the pump.
Venting may be necessary. This is
done by carefully unscrewing the
priming plug and letting out the air
trapped inside the pump.
3. Switch on the power.
4. Open some water taps so that one or both pumps
start. If they do not start, press the Start/Stop
button on both pumps.
5. Let the booster system run for 30 seconds to let
all remaining air out of the system.
6. The pumps are factory set, so the booster system
pressure will stabilise at factory setpoint and
Grundfos Eye will show a steady green light.
7. If the pressure is not stabilised, the booster
system will stop and restart. If the booster system
stops and restarts more than five times, turn
off both pumps by pressing their Start/Stop
button. Prime the pumps again. Start the system
by pressing the Start/Stop button on both pumps.
8. Adjust the required setpoint pressure by using the
Up or Down arrows on the operating panel.
Choose one of the pumps for the setpoint setting.
The pumps communicate, so it makes no
difference which pump you use. Monitor the
system pressure on the pressure gauge
If you change the outlet pressure, you
must adjust the precharge pressure in
the diaphragm tank accordingly.
9. The booster system is now in automatic mode and
ready for operation.
6.5 Shaft seal run-in
The shaft seal faces are lubricated by the pumped
liquid. A slight leakage from the shaft seal of up to 10
ml per day or 8 to 10 drops per hour may occur.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
When the pump is started for the first time, or when
the shaft seal has been replaced, a certain run-in
period is required before the leakage is reduced to an
acceptable level. The time required for this depends
on the operating conditions, that is, every time the
operating conditions change, a new run-in period will
be started.
Leaking liquid will drain through the drain holes in the
motor flange.
Install the product in such a way that leakage cannot
cause undesirable collateral damage.
7. Control functions
7.1 Constant pressure
The integrated speed controller keeps a constant
pressure in the pipe system. A pressure sensor
monitors changes in the water consumption and
signals to the speed controller to adjust the motor
speed up or down.
7.2 Dry-running protection
Dry-running protection automatically stops the pump
in case of dry running to prevent damage to the
pump.
To build up pressure, the motor will run at maximum
speed. When the motor runs at maximum speed, the
power consumption will be measured and compared
to the expected values for power consumption when
the pump is filled with water. In case the measured
value is below the expected value, the pump will stop
with dry-running alarm.
In case of a dry-running alarm, the pump will do the
following:
1. The pump stops.
2. The pump will restart 5 times every 10 seconds. If
the measured power consumption is still below
the expected value, the pump will stop.
3. After 5 minutes, the pump will try to restart again.
4. When water returns, you can either reset the
pump manually or wait for the pump to
automatically restart after 5 minutes.
16
English (GB)

7.3 Inlet pressure protection
Some models of the pump are fitted with an
adjustable pressure switch as inlet pressure
protection. The pressure switch is fitted to the inlet
manifold.
The inlet pressure setting may have to be adjusted
according to local regulations.
1
TM084065
Pos. Description
1 Pressure switch valve
Before starting up the system, make sure
that the pressure switch valve is open.
If the inlet pressure is below the lower
switching point, the system cannot start.
If the pressure switch has stopped the
system during operation due to the inlet
pressure being too low, the inlet pressure
must increase to a pressure that is higher
than the setting of the upper switching
point before the system can restart.
If necessary, adjust the lower switching point by
turning screw A and adjust the upper switching point
to a value higher than the lower switching point by
turning screw B.See the figure below.
Do not set the lower switching point to a
value below the minimum inlet pressure.
A B
TM058436
Adjustment of switching points
Pos. Description
A Low-pressure switching point
B High-pressure switching point
17
English (GB)

8. Setting the product
8.1 Operating panel
Stop
1
2
3
4
5
TM054848
Standard operating panel
Pos. Symbol Description
1
Grundfos Eye
Shows the operating status of
the pump.
2 - Light fields for indication of
setpoint.
3 Changes the setpoint.
4
Enables IR communication
with Grundfos GO and other
products of the same type.1)
5
Makes the pump ready for
operation/starts and stops the
pump.
Start:
If the button is pressed when
the pump is stopped, the pump
will only start if no other
functions with higher priority
have been enabled.
Stop:
If the button is pressed when
the pump is running, the pump
will always be stopped. When
the pump is stopped via this
button, the "Stop" text next to
the button will be on.
1) CME Boosters cannot communicate via radio.
Related information
13. Further product information
8.2 Setpoint setting
The setpoint must not be set higher than
the pressure which the pump can deliver.
Set the desired setpoint of the pump by pressing
or .
The light fields on the operating panel will indicate the
setpoint set.
Hmax: maximum head (see pump nameplate).
0
Hmax
TM057678
8.3 Start/stop of pump
Start the pump by pressing or by continuously
pressing until the desired setpoint is indicated.
Stop the pump by pressing . When the pump is
stopped, the "Stop" text next to the button will be on.
The pump can also be stopped by continuously
pressing until none of the light fields are on.
If the pump has been stopped by pressing , it can
only be given free to operation by pressing again.
If the pump has been stopped by pressing , it can
only be restarted by pressing .
8.4 Resetting of fault indications
A fault indication can be reset in one of the following
ways:
• Briefly press or on the pump. This will not
change the setting of the pump. A fault indication
cannot be reset by pressing or if the
buttons have been locked.
• Switch off the power supply until the indicator
lights are off.
• With Grundfos GO.
18
English (GB)

9. Servicing the product
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply to the
product including the power supply for
the signal relays. Wait at least 5
minutes before you make any
connections in the terminal box.Make
sure that the power supply cannot be
switched on accidentally.
DANGER
Magnetic field
Death or serious personal injury
‐Persons with pacemaker must not
handle the motor or rotor.
WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
WARNING
Biological hazard
Death or serious personal injury
‐When servicing the product, only use
Grundfos original spare parts.
Products in normal operation must be inspected once
a year.
Do the following:
1. Inspect the tank.
2. Check the precharge pressure.
Related information
4.2 Adjusting the diaphragm tank pressure
9.1 Cable requirements
WARNING
Electric shock
Death or serious personal injury
‐Comply with local regulations as to
cable cross-sections.
9.2 Megging
Megging of an installation incorporating
MGE motors is not allowed, as the built-in
electronics may be damaged.
10. Taking the product out of operation
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
19
English (GB)

11. Fault finding
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Pressurised system
Death or serious personal injury
‐Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐Drain the system or close the isolating
valves on either side of the pump.
WARNING
Biological hazard
Death or serious personal injury
‐When servicing the product, only use
Grundfos original spare parts.
11.1 Pump is not running
Pump is not running.
No lights on Grundfos Eye.
TM063804
Cause Remedy
Power supply failure. 1. Switch on the power
supply.
2. Check cables and
cable connections for
defects and loose
connections.
3. Check if the external
motor protection has
tripped.
Fuses blown. 1. Check cables and
cable connections for
defects.
2. Replace the fuses.
11.2 Pump is not running
Pump is not running.
Two opposite red indicator lights flashing
simultaneously, which indicates an alarm. The motor
is stopped.
TM053839
Cause Remedy
Sensor is defective. • Replace sensor.
The pump inlet pressure
is too low.
• Check the inlet
conditions of the pump.
The inlet pipe is partly
blocked by impurities.
• Remove and clean the
inlet pipe.
The non-return valve is
blocked in closed
position.
• Inspect, repair or
replace the non-return
valve if necessary.
There is air in the inlet
pipe or pump.
• Vent the inlet pipe and
the pump.
The inlet pressure
switch is defective.2)
• Replace the inlet
pressure switch.
2) Available as accessory for CMBE TWIN.
20
English (GB)