English (GB)
9
4. Fault finding
4.1 Safety instructions
4.2 Fault finding procedure
Fault finding is based on these sections in this order:
•
•
•
4.6 Fault finding using the indicator lights on the control panel
•
4.7 Fault finding using alarm and warning codes
•
8. Tightening torques and lubrication
The necessary tools for the fault finding can be seen in section
4.3 Operating conditions
Correct functioning of the MGE-F depends on these points:
Mains supply
• Check nameplate data, and measure the actual supply voltage
with a digital voltmeter (true RMS).
• Check the earth leakage circuit breaker and the backup fuses.
The MGE-F has no internal fuses.
Pump and motor load
• Check nameplate data, and measure the actual current
consumption with a digital amperemeter (true RMS). Do the
pump and the MGE-F match?
External signals, for instance from another controller
• Check that the external signals are suitable for the MGE-F.
See section
3.1 Wiring diagrams and signal terminals
and
installation and operating instructions for MGE 160 and MGE
180.
• Check that terminals 2 and 3 are connected and that the MGE-
F has been started via the control panel.
Sensors connected
• Check that the sensor measuring range matches the pump
application.
• Check that the settings of the MGE-F match the sensors
(current, voltage, minimum and maximum values).
Condensation
• Check whether condensation occurs in the terminal box. This
may happen if the ambient temperature becomes very low.
The problem may be overcome by enabling the standstill
heating function and by removing the drain plug in the motor.
See installation and operating instructions for MGE 160 and
MGE 180.
Electromagnetic disturbances
• Check that the wiring complies with the EMC Directive. See
installation and operating instructions for MGE 160 and MGE
180.
Start-up, installation and operating settings via the control
panel or Grundfos GO Remote
• Check that the green indicator light on the control panel (or
inside the terminal box) is on.
• Check that the settings in Grundfos GO Remote match the
pump application.
The menu displays are described in detail in the installation
and operating instructions for MGE 160 and MGE 180.
If the above points are according to the installation and operating
instructions for MGE 160 and MGE 180 and the pump application,
but a fault still exists and the red indicator light is on, continue the
fault finding in sections
4.6 Fault finding using the indicator lights
4.7 Fault finding using alarm and
WARNING
Electric shock
Death or serious personal injury
- Due to the capacitors of MGE-F, touching live
electrical parts may be fatal, even after the mains
supply has been disconnected. Disconnect the
mains supply, and wait at least 30 minutes or the
amount of time stated on the warning label under
the terminal box cover before touching any live
parts.
- Make sure that the mains cover is fitted in MGE-F
if you perform service work where fault finding with
power on and/or with connection to PC Tool Link is
needed. Turn off power and wait for the control box
to be de-energised before you check whether the
mains cover is fitted. If the mains cover is missing,
you can order it by part number 99926860.
- Note that the relay may be connected to an
external power supply and still be live after the
mains supply to the motor has been disconnected.
- Installation, commissioning, service, and
maintenance of equipment, systems, and circuits
may only be performed by Grundfos service
technicians or a Grundfos Authorised Service
Partner (ASP) who have attended training
equivalent to Grundfos Electronics Service Expert
(GESE) or similar.
- Always observe local applicable safety regulation.
CAUTION
Hot surface
Minor or moderate personal injury
- MGE-F may be hot.
Summary of Contents for MGE F
Page 1: ...MGE model F Service instructions GRUNDFOS INSTRUCTIONS ...
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