Grundfos MGE F, Service Instructions Manual

Page: 11 / 32

English (GB)
11
4.6 Fault finding using the indicator lights on the control panel
The operational state of the motor incl. possible faults can be
read via the indicator lights on the control panel.
If Grundfos GO Remote is available, we recommend you to start
fault finding via the fault codes.
See section
4.7 Fault finding using alarm and warning codes
.
In case of certain faults in the electronics, the
indicator lights on the control panel may indicate
differently from the indicator lights on the control
board. In these cases, the indicator lights on the
control board indicate the current operating and
alarm condition.
Indicator lights
Condition/cause Remedy
Green Red
On On
Normal ope indication of previous fault
1. The pump is running at
normal performance.
– The pump's duty/standby
function has been
activated, but there is no
communication with the
standby pump.
a) Has the power supply to the standby pump been switched off?
YES:
NO: Re-establish the power supply.
Proceed to point b).
b) Has the communication cable been disconnected?
YES:
NO: Check the communication cable.
Contact Grundfos Service.
2. The pump is running at
maximum speed.
– The sensor signal is
outside the set signal
range.
a) Does the sensor setting correspond to the sensor type installed? (0-10
V, 0-20 mA, 4-20 mA)
NO:
YES:
Correct the setting using Grundfos GO Remote or PC-Tool
E-Products.
Proceed to point b).
b) Is the voltage to the sensor connection 24 VDC?
TM
02
16
06
47
20
TM
04
20
72
47
20
NO Replace the I/O module.
YES Proceed to point c).
c) Is the sensor signal
– below 10 V (type 0-10 V sensor)?
– below 20 mA (type 0-20 mA sensor)?
– between 4 and 20 mA (type 4-20 mA sensor)?
TM
0
2
1
604
1
601
TM
0
4
2
072
1
908
NO:
YES: Replace the sensor.
Proceed to point d).
d) Has the sensor been connected correctly, and does the sensor signal
correspond to the system pressure?
NO:
YES: Connect the sensor signal correctly.
Replace the I/O module or the terminal box.
If the sensor is defective, replace it.
8: +24V
9: GND
A: RS485
Y: RS485
14: SENSOR IN
15: +24V (2)
16: GND
7: SENSOR INPUT
8: +24V
9: GND
4-20mA
+ OUT
0-10V
0/4-20mA - +OUT
G U
12: ANALOG OUTPUT
13: GND
14: SENSOR INPUT 2
15: +24V (2)
16: GND
0-
10
V
0/
4-
20m
A