10-1
10. Troubleshooting and Fault Diagnostics
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. The fault contact output energizes and the motor will coast to stop (The stop
method can be selected for specific faults).
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, please refer to Table 10.2.1 for possible causes and take appropriate measures.
Use one of the following methods to restart:
1. Set one of multi-function digital input terminals (03-00, 03-07) 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
OC
over current
The inverter output current
exceeds the overcurrent
level (200% of the inverter
rated current).
Acceleration / Deceleration time is
too short.
Contactor at the inverter output
side.
A special motor or applicable
capacity is greater than the inverter
rated value.
Short circuit or ground fault.
Extend acceleration /
deceleration time.
Check the motor wiring.
Disconnect motor and try
running inverter.
SC
short circuit
Inverter output short circuit
or ground fault.
Short circuit or ground fault (08-23 =
1).
Motor damaged (insulation).
Wire damage or deterioration.
Check the motor wiring.
Disconnect motor and try
running inverter.
GF
Ground fault
The current to ground
exceeds 50% of the
inverter rated output
current (08-23 = 1, GF
function is enabled).
Motor damaged (insulation).
Wire damage or deterioration.
Inverter DCCT sensors defect.
Replace motor.
Check the motor wiring.
Disconnect motor and try
running inverter.
Check resistance between
cables and ground.
Reduce carrier frequency.
