CHINT NVF5-2.2/TS4-B - Page 96

NVF5 Series User Manual Chapter 7 Troubleshooting
6、 Unsuitable V / F curve
Adjust V/F cruve or adjust
manual torque boost
E.OC2
Inverter
Decel.
running
overcurrent
1、 Low grid voltage
Check the input power
supply
2、 Decel. Time too short
Increase decel. time
3、
Potential Energy Load or Big
Inertial Load
Add Regen. Brake
Components
4、 Too small inverter power
Enlarge inverter power rate
E.OC3
Inverter
constant
speed running
overcurrent
1、 Accel. Time too short
Increase accel. time
2、Load change frequently or
abnormal load
Check load
3、 Low grid voltage
Check the input power
supply
4、 Too small inverter power
Enlarge inverter power rate
E.OV1
Inverter
Accel.
running
overvoltage
1、Motor short circuit to ground
Check motor cable
2、 Abnormal input voltage
Check the input power
supply
3、 Motor quick start again at
high speed
Start inverter when motor
stop
4、 Accel. Time too short
Increase accel. time
E.OV2
Inverter
Decel.
running
overvoltage
1、
Motor short circuit to ground
Check motor cable
2、
Potential Energy Load or Big
Inertial Load
Add Regen. Brake
Components
Increase decel. time
Increase decel. time
E.OV3
Inverter
constant
speed running
overvoltage
1、
Motor short circuit to ground
Check motor cable
2、 Incorrect setting of
Parameter ASR
in vector control
Refer to Parameter Group
F3 about how to set ASR
3、 Accel. Time too short
Increase accel. time
4、Abnormal Input Power Supply
Check Input Power Supply
5、
Abnormal fluctuation of input
voltage
Install Input AC Reactor
6、 Big Inertial Load
Add Regen. Brake
Components
E.SPI
Input Lose
Phase
R.S.T lose phase
Checking R S T Wiring
Check Input Voltage
E.SPO
Output Lose
Phase
U.V.W lose phase
Checking U V W Wiring
Check Motor Cable
E.FO Power Module
1、
The output three-phase with
Re-wire, confirm the
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