2.3
Fault messages on the display
2.3.1
µP- fault
Faults that have a "µP-fault" in the first display line can only be reset by means of the reset button S4 on board info-
electronics -A1. Resetting by way of normal inverter reset (e.g. via control panel or terminal strip) is not possible.
These faults indicate errors in the program memory, in the internal data, or in the hardware. If such a fault cannot be
reset, a service station must be informed.
Fault message
on the display
Possible fault cause
µP fault
Board info defective
2.3.2
Inverter fault
Faults that have an "!! Inverter fault !!" in the first display lines can be reset by means of an inverter reset, provided that
the fault cause no longer exists. These are faults that are caused by an inverter defect. If such a fault cannot be reset,
a service station must be informed.
Fault message
on the display
Possible fault cause
! Inverter fault !
Wrong power unit
Incorrect power unit encoding, (board info-electronics, plug connections, incorrect
wiring)
! Inverter fault !
AD/DA-conv. fault
AD/DA converter malfunction, AD/DA converter defective
! Inverter fault !
Temperature sensor
A temperature sensor supplies implausible values, or connection to the temperature
sensor for measuring inside or heat sink temperature defective
! Inverter fault !
Supply voltage
Fault in one of the supply voltages on board info-electronic
! Inverter fault !
in power section
Fault in the control of the rectifier transistors, control defective, control signal
interrupted or changed, IGBT module defective
! Inverter fault !
Current transformer
Current transformer defective; current transformer supply not connected or in order
