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