CHINT NVF5-0.75/TS4-B - Page 98

NVF5 Series User Manual Chapter 7 Troubleshooting
manual torque boost
E.OL2
Inverter
Overload
1、 Incorrect Motor Nameplate
Motor auto tuning
2、Excessive load
Enlarge inverter power rate
3、Excessive DC Brake
Reduce DC brake
current, increase brake
time
4、 Accel. Time too short
Increase accel. time
5、 Low grid voltage
Check grid voltage
6、 Unsuitable V / F curve
Adjust V/F cruve or adjust
manual torque boost
E.OL3
Buffer Power
Supply
Failure
1、DC Bus Voltage fluctuates
around undervoltage threshold
Asking for Chint technical
support
E.EF External Fault
External Fault Emergency Stop
Terminal Effective
Check external device
connecting with external
fault terminal
E.EEP
EEPROM
Read-Write
Fault
Control Parameter Read-Write
Error
STOP key Reset
Asking for Chint technical
support
E.CE
Serial Interface
communication
error
1、 Host computer problem
Check host computer
wiring
2、Comm. Cable problem
Check Comm. wiring
3、Comm. Parameters problem
Set correct comm.
parameters
E.ItE
Current
detection
circuit
abnomaly
1、
Loose control board wiring
or plug
Check and rewire
2、 Aux. power supply damage
Asking for Chint technical
support
3、 Hall Element Damage
4、 Amplification circuit
abnomaly
E.tE
Auto Tuning
Problem
1、Set Wrong Motor Data
Set correct motor data
2、 Reverse Auto Tuning is
prohibited in reverse running
Disable Reverse
3、 Poor contact of motor
connecting cable
Check motor cable
4、Auto Tuning Overtime
Check Parameter F0.08
（Frequency Max.）
whether is samller than
rated frequency
E.StG
Motor short
circuit to
Motor short circuit to ground Check motor cable
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