Grundfos MGE 100, Instructions Manual

Page: 25 / 36

English (GB)
25
9.4 Power module
If reading of fault codes does not provide a clear answer as to
whether the power module is functioning correctly, you can
proceed as described below.
1. Check that the voltage to the module is within the limit values
stated on the nameplate. Check all phases of a three-phase
motor.
2. If there are signs of moisture in the terminal box, take
necessary precautions to prevent similar faults.
3. Check the two status diodes of the power module by looking
through dedicated holes in the PCB. Status diode "LED 5V"
must be permanently on when connected to mains. Status
diode "LED Micro controller" flashes when the functionality is
correct. See the tables below.
Fig. 60 Status diode of power module, single-phase.
WARNING
Electric shock
Death or serious personal injury
- Do not touch the terminals of the power module as
they are still live.
Measuring equipment must be free of static
electricity or have same potential as the motor before
being used for measurement without isolation cover.
It may be necessary to dim the light as the diode light
is weak.
Status, single-phase Fault
LED Micro controller is
permanently on.
• The microprocessor is frozen.
• No initialising message from
the functional module.
Switch the power supply off and
on. If this does not solve the
problem, replace the power
module. See section
7.8 Replacing the power module
.
LED Micro controller is off.
The power module is defective.
See section
7.8 Replacing the
power module
.
The LED Micro controller is
flashing 180 times/minute,
and the LED 5V is
permanently on.
The power module is functional.
The LED 5V is off.
The power module is defective.
See section
7.8 Replacing the
power module
.
The LED Micro controller
and LED 5V are flashing
40-80 times/minute. Short circuit in the connection to
the functional module or in the
functional module.
T
M
05
71
2
6
06
1
3
Status, three-phase Fault
The LED Micro controller is
permanently on.
• The microprocessor is frozen.
• No initialising message from
the functional module.
Switch the power supply off and
on. If this does not solve the
problem, replace the power
module. See section
7.8 Replacing the power module
.
The LED Micro controller is
off.
The power module is defective.
See section
7.8 Replacing the
power module
.
The LED Micro controller is
flashing 3 times per second. The processor of the power
module is functional.
LED 5V is permanently on.
The processor of the power
module is functional.
LED 5V is off.
The power module is defective.
See section
7.8 Replacing the
power module
.
LED 5V and LED Micro
Controller are flashing
simultaneously.
• Short circuit in the connection
to the functional module.
• Short circuit in the functional
module.
• The functional module is
disconnected.
• The power module is defective.
LED 5V LED Micro Controller