5.2Troubleshooting

PROTECTIVE FUNCTIONS

If any function of the inverter is lost due to occurrence of a fault, clear up the cause and make correction in accordance with the following procedure. Contact your sales representative if the corresponding fault is not found below, the inverter has failed, parts have been damaged, or any other fault has occurred.

5.2.1 Checking the operation panel display at alarm stop

The alarm code is displayed on the operation panel to indicate the cause of a faulty operation. Clear up the cause and take proper action in accordance with the following table:

Operation Panel

Check Point

Remedy

Display

 

 

E.OC1

Acceleration too fast?

Increase acceleration time.

Check for output short circuit or ground fault.

 

 

E.OC2

Sudden load change?

Keep load stable.

Check for output short circuit or ground fault.

 

 

 

Deceleration too fast?

Increase deceleration time.

E.OC3

Check for output short circuit or ground fault.

 

 

Mechanical brake of motor operating too fast?

Check brake operation.

E.OV1

Acceleration too fast?

Increase acceleration time.

E.OV2

Sudden load change?

Keep load stable.

 

 

Increase deceleration time. (Set deceleration time

E.OV3

Deceleration too fast?

which matches load GD2.)

 

 

Reduce braking duty.

E.THM

Motor used under overload?

Reduce load.

E.THT

Increase motor and inverter capacities.

 

E.IPF

Check the cause of instantaneous power failure.

Restore power.

 

Large-capacity motor started?

Check power system equipment such as power

E.UVT

Jumper or DC reactor connected across terminals P-

supply.

 

P1?

Connect jumper or DC reactor across terminals P-P1.

E.FIN

Ambient temperature too high?

Set ambient temperature within specifications.

E. GF

Check motor and cables for ground fault.

Resolve ground faults.

E.OHT

Check motor for overheat.

Reduce load and frequency of operation.

E.OLT

Motor used under overload?

Reduce load.

Increase motor and inverter capacities.

 

 

E.OPT

Check for loose connectors.

Connect securely

E.OP1 to E.OP3

Option function setting or operation proper?

Check the option function setting, etc.

(1 to 3 indicate the option slot numbers.)

 

 

E. PE

Number of parameter write times too many?

Control card

E.PUE

DU or PU fitted securely?

Fit DU or PU securely.

E.RET

Check cause of alarm.

 

E.LF

Check for open output phase.

Repair open phase.

E.CPU

Check for loose connectors.

Change inverter.

Connect securely.

 

 

E.P24

Check PC terminal output for short.

Repair short.

E.CTE

Check PU connector cable for short.

Check PU and cable.

E.MB1 to MB7

Check brake sequence.

 

PS

STOP key of operation panel pressed during external

Check load status.

operation to stop?

Refer to Pr.75.

 

RB

Brake resistor used too often?

Increase deceleration time.

TH

Load too large? Sudden acceleration?

Reduce load amount or frequency of running.

 

Motor used under overload?

Lighten load.

OL

Sudden deceleration?

Reduce frequency of braking.

oL: Overvoltage stall

 

 

 

 

OL: Overcurrent stall

 

E.14(DC fuse)

Is the DC circuit short circuited?

Repair the short-circuited section, and replace the DC

fuse.

 

 

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Mitsubishi Electronics FR-A500L instruction manual Troubleshooting, Checking the operation panel display at alarm stop