Chapter 13. Troubleshooting & Maintenance

13.2

Fault Remedy

 

 

 

 

 

Protective

 

Cause

 

 

Remedy

 

 

functions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿ CAUTION:

 

 

 

 

 

 

 

When an overcurrent fault occurs, operation must be started after the cause is removed to

Overcurrent

avoid damage to IGBT inside the inverter.

 

 

 

 

 

 

 

z Accel/Decel time is too short compared to

) Increase the Accel/Decel time.

 

 

 

 

the GD2 of the load.

) Replace

the

inverter

with

appropriate

 

 

z Load is greater than the inverter rating

 

 

capacity.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

z Inverter output is issued when the motor is

) Resume operation after stopping the motor

 

 

 

free running.

or use H22 (Speed search) in Function group

 

 

z Output short circuit or ground fault has

2.

 

 

 

 

 

 

 

occurred.

) Check output wiring.

 

 

 

 

z Mechanical brake of the motor is operating

 

 

 

 

 

 

 

 

too fast.

) Check the mechanical brake.

 

 

 

z Ground fault has occurred at the output

) Check the wiring of the output terminal.

 

 

 

wiring of the inverter

 

 

 

 

 

Ground fault

z

The insulation of the motor is damaged due

) Replace the motor.

 

 

 

current

 

to heat.

 

 

 

 

 

 

z Load is greater than the inverter rating.

) Upgrade the capacity of motor and inverter

 

 

 

 

z Inverter capacity is incorrectly selected.

or reduce the load weight.

 

 

 

Inverter

) Select correct inverter capacity.

 

 

 

 

 

 

overload

z

Torque boost scale is set too large.

 

 

 

 

 

 

 

) Reduce torque boost scale.

 

 

 

 

 

 

Overload trip

z Cooling system has faults.

) Check for alien substances clogged in the

 

 

 

 

z An old cooling fan is not replaced with a

heat sink.

 

 

 

 

Heat sink

) Replace the old cooling fan with a new one.

 

new one.

 

 

 

 

 

 

overheat

z

Ambient temperature is too high.

) Keep ambient temperature under 40°C.

 

 

z Faulty contact of magnetic switch at output

 

 

) Make connection of magnetic switch at

 

 

z

Faulty output wiring

output of the inverter securely.

 

Output Phase

 

 

) Check output wiring.

 

 

 

loss

z

An alien substance is clogged in a

) Check the ventilating slot and remove the

 

 

 

 

 

ventilating slot.

clogged substances.

 

 

Cooling fan

z

Inverter has been in use without changing a

) Replace the cooling fan.

 

 

 

fault

 

cooling fan.

 

 

 

 

 

 

z Decel time is too short compared to the

) Increase the Decel time.

 

 

 

 

 

 

 

 

 

GD2 of the load.

 

 

 

 

 

 

 

z Regenerative load is at the inverter output.

) Use Dynamic Brake Unit.

 

 

Over voltage

z Line voltage is too high.

) Check whether line voltage exceeds its

 

 

 

 

z Line voltage is low.

rating.

 

 

 

 

 

 

) Check whether line voltage is below its

 

 

z Load larger than line capacity is connected

rating.

 

 

 

 

 

 

) Check the incoming AC line. Adjust the line

 

 

 

to line (ex: welding machine, motor with high

capacity corresponding to the load.

 

 

 

 

starting current connected to the commercial

 

Low voltage

 

 

 

 

 

 

 

line).

 

 

 

 

 

 

 

z Faulty magnetic switch at the input side of

) Change a magnetic switch.

 

 

 

 

the inverter.

 

 

 

z

Motor has overheated.

) Reduce load weight and operating duty.

 

 

z Load is greater than inverter rating.

) Change inverter with higher capacity.

 

 

z ETH level is set too low.

 

 

) Adjust ETH level to an appropriate level.

 

 

z Inverter capacity is incorrectly selected.

Electronic

z

Inverter has been operated at low speed for

) Select correct inverter capacity.

 

 

thermal

 

too long.

) Install a cooling fan with a separate power

 

 

 

 

supply.

 

 

 

 

119

Page 119
Image 119
LG Electronics C Series manual Fault Remedy, Avoid damage to Igbt inside the inverter