Fault Remedy - LG SV008iS5-2 Manual

5.2 Fault Remedy

Protective
Function
1) Acceleration/Deceleration time is too short compared to
the GD²of the load
2) Load is larger than the inverter rating
3) Inverter turns output on when the motor is free running.
Over Current
4) Output short or ground fault has occurred
Protection
5) Mechanical brake of the motor is operating too fast
6) Components of the main circuit have overheated due
to a faulty cooling fan
Ground Current 1) Ground fault has occurred at the output wiring of inverter.
Protection 2) The insulation of the motor is damaged due to heat.
1) Acceleration time is too short compared to the GD²of load
Over Voltage
2) Regenerative load at the output
Protection
3) Line voltage high
Current Limit 1) Load is larger than the inverter rating
Protection 2) Selected incorrect inverter capacity
(Overload 3) Set incorrect V/F pattern
Protection)
1) Damage due to repeated over current protection
Fuse Damage 2) Damage due to instant deceleration when motor is at an
excessive excitation status.
1) Cooling fan damaged or an alien substance inserted
2) Cooling system has faults
Heat Sink
3) Ambient temperature high
Overheat
1) Motor has overheated
2) Load is larger than inverter rating
3) ETH level too low
Electronic
4) Selected incorrect inverter capacity
Thermal
5) Set incorrect V/F pattern
6) Operated too long at low speeds
External fault A External fault has occurred
External fault B External fault has occurred
1) Line voltage low
2) Load larger than line capacity is connected to line
Low Voltage
(welding machine, motor with high starting current
Protection
connected to the commercial line)
3) Faulty magnetic switch at the input side of the inverter
1) Short has occurred between the upper and lower IGBT.
2) Short has occurred at the output of the inverter
Over Current 2
3) Acceleration/Deceleration time is too short compared to
the GD²of load
Output Phase 1) Faulty contact of magnetic switch at output
Open 2) Faulty output wiring
Option Fault Faulty option connector connection
Chapter 5 - Troubleshooting & Maintenance
Cause
77
Remedy
1) Increase Accel/Decel time
2) Increase inverter capacity.
3) Operate after motor has stopped
4) Check output wiring
5) Check mechanical brake operation
6) Check cooling fan
(Caution) Operating inverter prior to correcting fault may
damage the IGBT
1) Investigate the output wiring of inverter
2) Exchange motor
1) Increase deceleration time
2) Use regenerative resistor option
3) Check line voltage
1) Increase capacity of motor and inverter
2) Select correct inverter capacity
3) Select correct V/F pattern
Exchange the fuse
(Caution) The IGBT receives damages on many
occasions when Fuse Open Trip occurs
1) Exchange cooling fans and/or eliminate alien
substance
2) Check for alien substances in the heat sink
3) Keep ambient temperature under 40 ℃
1) Reduce load and/or running duty
2) Increase inverter capacity
3) Adjust ETH level to an appropriate level
4) Select correct inverter capacity
5) Select correct V/F pattern
6) Install a cooling fan with a separate power supply
Eliminate fault at circuit connected to external fault
terminal or cause of external fault input
Eliminate fault at circuit connected to external fault
terminal or cause of external fault input
1) Check line voltage
2) Increase line capacity
3) Exchange magnetic switch
1) Check IGBT
2) Check output wiring of inverter
3) Increase acceleration time
1) Check magnetic switch at output of inverter
2) Check output wiring
Check option connection