Janitza AHF
78
9. Troubleshooting
Malfunctions due to user errors:
• Incorrect connection of the CT cable or incorrect parameter setting. These faults can
be detected by the user through careful observation of the data at the interface on the
monitor.
• If the compensation appears to have little effect and there is no warning notice, contact
a Janitza service technician;
• If the LCD screen displays an alarm message, contact a Janitza service technician;
• If the device shows no reaction on starting, contact a Janitza service technician;
No.
Fault and alarm
Possible cause
Solution
1
Communication
error
Communication error between monitor
and AHF module
Check to be sure the communication
cable is properly connected.
2
Overtemperature
– Ambient temperature is too high
– Air inlet is blocked
– Fan fault
– Troubleshooting is carried out step by step
3
Input voltage is
not in the normal
range
– Wiring of the power supply line is not correct
(3-phase and 3-conductor/ 3-phase and 4-con-
ductor)
– Input voltage is overloaded or underloaded
– Inverter is not functioning or is disabled
Check to see whether:
– the module is connected correctly
– the power supply line is connected correctly
– the input phase voltage is within the range of
132 V to 264 V
4
Input frequency is
not in the normal
range
Inverter is disabled or not functioning,
because the input frequency exceeds the
limits
Check whether the frequency of the
AC input is in the range of 40.5 to 62.5
Hz
5
Bus overvoltage
Overvoltage
Contact your Janitza service technician
6
Error on the
emergency power
supply (UPS)
Internal UPS error
Contact your Janitza service technician
7
No compensation
current
– AHF not switched on
– Problem with CT installation and wiring
– Compensation rate too low
Check:
– whether the AHF is switched on
– the setting of the compensation rate, the
CT position and wiring, and whether the CT
cable is securely connected
8
Fuse tripped
At least one input fuse has an open circuit
Contact your Janitza service technician
9
Setup of the
controller
parameters
The controller parameters read out and the
set controller parameters do not match
Contact your Janitza service technician
10
Inverter
overloaded
Compensation current of the AHF exceeds
the rated current
Check whether the capacity of the AHF
suits the load
11
Fan fault
Defective fan
Contact your Janitza service technician
12
Error in setting the
CT ratio
Error in setting the external CT ratio
Check whether the installation
direction of the CT and the phase
sequence are correct
Figure 5-1 Troubleshooting
