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3.5 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 an R100 remote control is available, we recommend you to start fault finding via the R100 fault code.
See section
3.6 Fault finding using alarm and warning codes
.
Note
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 the R100.
Proceed to point b).
b) Is the voltage to the sensor connection 24 VDC?
TM
02
16
06
16
01
T
M
04
20
72
19
08
NO:
YES:
Replace the I/O module.
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)?
T
M
02
16
04
16
01
TM
04
20
72
19
08
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.
[To be continued on the next page]
8: +24V
9: GND
12: ANALOG OUTPUT
13: GND
14: SENSOR INPUT 2
15: +24V (2)
16: GND
0-
10
V
0/
4-
20m
A
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
