10-1
10. Troubleshooting, Fault Diagnostics and Maintenance
10.1 General
Inverter fault detection and early warning / self-diagnosis function. When the inverter detects a fault, a fault
message is displayed on the keypad.
When the inverter detects a warning / self-diagnostics error, the digital operator will display a warning or
self-diagnostic code, the fault output does not energize in this case. Once the warning is removed, the system will
automatically return to its original state.
10.2 Fault Detection Function
When a fault occurs, refer to Table 10.2.1 for possible causes and appropriate measures.
Use one of the following methods to restart:
1. Set one of multi-function digital input terminals (03-00 ~ 03-05) to 17 (Fault reset); activate input
2. Press the reset button on the keypad.
3. Power down inverter wait until keypad goes blank and power-up the inverter again.
When a fault occurs, the fault message is stored in the fault history (see group 12 parameters).
Table 10.2.1 Fault information and possible solutions
LED display
Description
Cause
Possible solutions
Over Current
The inverter output current
exceeds the overcurrent level
(200% of the inverter rated
current).
Acceleration / Deceleration time is
set too short.
Contactor installed at the inverter
output side.
Motor rating exceeds inverter rating.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
O
ver
C
urrent
The inverter output current
exceeds the overcurrent level
in acceleration time
Acceleration time set too short
Motor rating is exceeds inverter
rating.
Short circuit between winding and
shell of motor
Short circuit between wire and
ground of motor
IGBT failure
Set the longer acceleration
time
Change to bigger capacity
of inverter
Examine motor
Check the wire
Replace IGBT module
O
ver
C
urrent
The inverter output current
exceeds the overcurrent level
in acceleration time
Acceleration time set too short
Motor rating is exceeds inverter
rating
Short circuit between motor winding
and motor casing
Short circuit between wire and
ground of motor
IGBT failure
Set the longer acceleration
time
Change to bigger capacity
of inverter
Check motor
Check wiring
Replace IGBT module