Chapter 6: Maintenance and Troubleshooting
GS1 Series AC Drive User Manual
6–4
Fault Codes
Fault Name Fault Descriptions Corrective Actions
oL1
Internal electronic overload trip
1. Check for possible motor overload.
2. Check electronic thermal overload setting.
3. Increase motor capacity.
4. Reduce the current level so that the AC drive output
current does not exceed the value set by the Motor
Rated Current 0-01.
oL2
Motor overload. Check the parameter
settings (6-07 to 6-09)
1. Reduce the motor load.
2. Adjust the over-torque detection setting to an
appropriate level.
ocR
Over-current during acceleration:
1. Short-circuit at motor output.
2. Torque boost too high.
3. Acceleration time too short.
4. AC drive output capacity is too
small.
1. Check for possible poor insulation at the output line.
2. Decrease the torque boost setting in 2-03.
3. Increase the acceleration time.
4. Replace with the AC drive with one that has a higher
output capacity (next HP size).
ocd
Over-current during deceleration
1. Short-circuit at motor output.
2. Deceleration time too short.
3. AC drive output capacity is too
small.
1. Check for possible poor insulation at the output line.
2. Increase the deceleration time.
3. Replace with the AC drive with one that has a higher
output capacity (next HP size).
ocn
Over-current during steady state
operation:
1. Short-circuit at motor output.
2. Sudden increase in motor loading.
3. AC drive output capacity is too
small.
1. Check for possible poor insulation at the output line.
2. Check for possible motor stall.
3. Replace with the AC drive with one that has a higher
output capacity (next HP size).
cF1
Internal memory IC cannot be
programmed.
1. Switch off power supply.
2. Check whether the input voltage falls within the AC
drive's rated input voltage.
3. Switch the AC drive back on.
cF2
Internal memory IC can not be read.
1. Check the connections between the main control
board and the power board.
2. Reset drive to factory defaults.
XPF
Hardware protection failure Return to the factory.
codE
Software protection failure Return to the factory.
cF3
AC Drive’s internal circuitry
abnormal.
1. Switch off power supply.
2. Check whether the input voltage falls within the
rated AC drive input voltage. Switch on the AC drive.
EF
The external terminal EF-CM goes
from OFF to ON.
When external terminal EF-CM is closed, the output
will be turned off (under N.O. E.F.).
cFR
Auto accel/decel failure
Don’t use the function of auto acceleration/
deceleration.
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