Fault tracing
174
SLOT OVERLAP
(FF8A)
Two option modules have same connection
interface selection.
Check connection interface selections in group
98 OPTION MODULES.
START INHIBI
(FF7A)
Optional start inhibit hardware logic is
activated.
Check start inhibit circuit (AGPS board).
SUPPLY PHASE
(3130)
02.19 FW 2 bit 00
Intermediate circuit DC voltage is oscillating
due to missing mains phase, blown fuse or
rectifier bridge internal fault.
Trip occurs when DC voltage ripple is 13% of
DC voltage.
Check mains fuses.
Check for mains supply imbalance.
TEMP DIF xx y
(4380)
Excessive temperature difference between
several parallel connected inverter modules. xx
(1...12) refers to inverter module number and y
refers to phase (U, V, W).
Alarm is indicated when temperature difference
is 15°C. Fault is indicated when temperature
difference is 20°C
Excessive temperature can be caused e.g. by
unequal current sharing between parallel
connected inverters.
Check cooling fan.
Replace fan.
Check air filters.
THERMAL MODE
(FF50)
Motor thermal protection mode is set to DTC
for high-power motor.
See parameter 30.05.
THERMISTOR
(4311)
02.18 FW 1 bit 05
(programmable
Fault Function
30.04…30.05)
Motor temperature is excessive. Motor thermal
protection mode selection is THERMISTOR.
Check motor ratings and load.
Check start-up data.
Check thermistor connections to digital input
DI6.
UNDERLOAD
(FF6A)
02.18 FW 1 bit 08
(programmable
Fault Function
30.13…30.15)
Motor load is too low due to e.g. release
mechanism in driven equipment.
Check for problem in driven equipment.
Check Fault Function parameters.
USER MACRO
(FFA1)
No User Macro saved or file is defective. Create User Macro.
Fault Cause What to Do
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