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Troubleshooting; Checking The Operation Panel Display At Alarm Stop - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

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5.2 Troubleshooting

5.2 Troubleshooting
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 procedures. 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
Display
Acceleration too fast?
E.OC1
Check for output short circuit or ground fault.
Sudden load change?
E.OC2
Check for output short circuit or ground fault.
Deceleration too fast?
E.OC3
Check for output short circuit or ground fault.
Mechanical brake of motor operating too fast?
E.OV1
Acceleration too fast?
E.OV2
Sudden load change?
E.OV3
Deceleration too fast?
E.THM
Motor used under overload?
E.THT
Check the cause of instantaneous power
E.IPF
failure.
Large-capacity motor started?
E.UVT
Jumper or DC reactor connected across
terminals P-P1 (+ -P1)?
E.FIN
Ambient temperature too high?
E. BE
Correct brake duty?
E. GF
Check motor and cables for ground fault.
E.OHT
Check motor for overheat.
E.OLT
Motor used under overload?
E.OPT
Check for loose connectors.
Option function setting or operation proper?
E.OP1 to E.OP3
(1 to 3 indicates the option slot numbers.)
E. PE
Number of parameter write times too many?
E.PUE
DU or PU fitted securely?
E.RET
Check the cause of retry failure.
E.LF
Check for open output phase.
E.CPU
Check for loose connectors.
E.E6
Check for loose connectors.
E.E7
Check for loose connectors.
Err
Check for loose connectors.
E.P24
Check PC terminal output for short.
E.CTE
Check PU connector cable for short.
FN
Cooling fan normal?
E.MB1 to MB7
Check brake sequence.
STOP key of operation panel pressed during
PS
external operation to stop?
RB
Brake resistor used too often?
TH
Load too large? Sudden acceleration?
Motor used under overload?
Sudden deceleration?
OL
oL: Overvoltage stall
OL: Overcurrent stall
When the protective function is activated, take proper corrective action, reset the inverter, then resume
z
operation.
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Check Point
Increase acceleration time.
Keep load stable.
Increase deceleration time.
Check brake operation.
Increase acceleration time.
Keep load stable.
Increase deceleration time. (Set
deceleration time which matches load
2
GD
.)
Reduce braking duty.
Reduce load.
Increase motor and inverter capacities.
Restore power.
Check power system equipment such as
power supply.
Connect jumper or DC reactor across
terminals P-P1 (+ -P1).
Set ambient temperature within
specifications.
Change inverter.
Resolve ground faults.
Reduce load and frequency of operation.
Reduce load.
Increase motor and inverter capacities.
Connect securely
Check the option function setting, etc.
Change inverter.
Fit DU or PU securely.
Correct retry problem.
Repair open phase.
Change inverter.
Connect securely.
Change inverter.
Connect securely.
Change inverter.
Connect securely.
Change inverter.
Connect securely.
Repair short.
Check PU and cable.
Change fan.
Change brake sequence.
Check load status.
For clearing method, refer to page 96.
Increase deceleration time.
Reduce load amount or frequency of
running.
Lighten load.
Reduce frequency of braking.
179
PROTECTIVE FUNCTIONS
Fault Rank
Remedy
Major
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Minor
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