NVF5 Series User Manual Chapter 7 Troubleshooting
Protection
interphase short circuit or
ground
short circuit
motor insulation
2
、
Inverter instantaneous
overcurrent
See overcurrent handling
3
、
Fan duct blockage or fan
damage
Clear the fan duct or
replace
the fan
4
、
High ambient temperature
Lower ambient temperature
5
、
Loose I/O wiring or plug
Check wiring and re-wire
6
、
Current waveform anomaly
due to output lose-phase and
other reasons`
Checking wiring
7
、
Aux. power supply damage,
drive voltage undervoltage
Asking for Chint technical
support
8
、
IGBT Module Damage
9
、
Control Board Abnormal
E.OH1
Heat Sink
Overheat
1
、
High ambient temperature
Lower ambient temperature
2
、
Fan duct blockage
Clear the fan duct
3
、
Fan damage
Replace
the fan
4
、
IGBT abnormal
Asking for Chint technical
support
5
、
Temperature checking circuit
error
E.OH2
Rectifier
Bridge
Overheat
1
、
High ambient temperature
Lower ambient temperature
2
、
Fan duct blockage
Clear the fan duct
3
、
Fan damage
Replace
the fan
4
、
Temperature checking circuit
error
Asking for Chint technical
support
E.OL1
Motor
Overload
1
、
Incorrect Motor Overload
Ratio
Input correct motor
overload ratio
2
、
Motor Stall or load change
frequently
Check motor load
3
、
Long time low speed ruuning
with excessive load
Select Frequency
conversion motor
4
、
Low grid voltage
Check grid voltage
5
、
Unsuitable V / F curve
Adjust V/F cruve or adjust
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