Fault Finding Using Alarm And Warning Codes - Grundfos CUE Series Service Instructions Manual

3.4 Fault finding using alarm and warning codes

Besides being indicated by the indicator lights on the operating
panel, faults are also shown as codes in the display.
3.4.1 Alarm and warning list
The list gives you an overview of the possible alarms and
warnings and a description of the causes and suggestions for
remedy.
These abbreviations are used in the column "Type":
W: Warning.
A: Alarm.
L: Locked alarm: The alarm cannot be reset until the mains
supply has been switched off.
1): The action in case of alarm depends on the pump type.
Alarm
Description
code
1 10 V low
2 Live zero error
3 No motor
8
Cause
The control card voltage is below 10 V from terminal
50.
Remove some of the load from terminal 50, as the
10 V supply is overloaded.
Maximum. 15 mA or minimum 590 Ω.
This condition can be caused by a short in a
connected potentiometer or improper wiring of the
potentiometer.
Sensor 1 (terminal 54):
The analog input signal has fallen below these
control values for more than 500 ms:
Type: 4-20 mA: Alarm under 2 mA (reset over 3
mA).
Type: 2-10 V: Alarm under 1 V (reset over 1.5 V).
The types 0-20 mA and 0-10 V are not monitored.
Fault at startup:
1. The setting of contact A54 for selection of signal
type is incorrect.
2. The setting is incorrect for the sensor.
3. The sensor connection is incorrect.
Fault after startup:
1. Incorrect supply voltage to sensor.
2. Sensor is defective or sensor cable is missing.
No motor has been connected to the output of the
adjustable frequency drive. This warning or alarm
will only appear if programmed by the user in
parameter 1-80, Function at Stop.
Remedy
Remove the wiring from terminal 50. If the
warning clears, the problem is with the
customer wiring. If the warning does not
clear, replace the control card.
Set the contact correctly according to
section "Connection of a thermistor (PTC) to
CUE" in the CUE installation and operating
instructions.
Correct the sensor settings.
Connect the sensor correctly according to
section "Wiring diagram, signal terminals" in
the CUE installation and operating
instructions.
Check that there are 24 ± 1 VDC between
terminals 12 and 55:
• If the voltage is not okay, contact
Grundfos Service.
• If the voltage is okay, check if there is
minimum 4 mA or 1 V between terminals
54 and 55. If yes, contact Grundfos
Service.
If the cable is missing, or the sensor is
defective, contact Grundfos Service.
Check the connection between the drive and
the motor.
Type
W
W/A
W/A