YASKAWA J1000 CIMR-JC series Quick Start Manual page 28

7 Troubleshooting
LED Display AL FLT
External Faults
 
to
Ground Fault

Safe Disable
Fault

Output Phase
Loss

Overcurrent

Heatsink
Overheat
 
or
Motor
Overload

Drive
Overload

EN 28
Cause
• An external fault was triggered by an
external device via one of the digital
inputs S1 to S6.
• The digital inputs are set up incorrectly.
• Ground leakage current has exceeded
50% of the drives rated output current.
• Cable or motor insulation is broken.
• Excessive stray capacitance at drive
output.
Drive output is disabled while only one of
the Safe Disable inputs is open. (normally
both input signals H1 and H2 should be
open)
• One channel is internally broken and
does not switch off, even if the external
signal is removed.
• Only one channel is switched off by the
upper controller.
Output cable is disconnected or the motor
winding is damaged.
Loose wires at the drive output.
Motor is too small (less than 5% of drive
current).
Short circuit or ground fault on the drive
output side
The load is too heavy.
The accel./decel. times are too short.
Wrong motor data or V/f pattern settings.
A magnetic contactor was switched at the
output.
Surrounding temperature is too high.
The cooling fan has stopped.
The heatsink is dirty.
The airflow to the heatsink is restricted.
The motor load is too heavy.
The motor is operated at low speed with
heavy load.
Cycle times of accel./ decel. are too short.
Incorrect motor rated current has been set.
The load is too heavy.
The drive capacity is too small.
Too much torque at low speed.
YASKAWA ELECTRIC TOEP C710606 27C - AC Drive J1000 - Quick Start Guide
Corrective Action
• Find out why the device tripped the EF.
Remove the cause and reset the fault.
• Check the functions assigned to the
digital inputs.
• Check the output wiring and the motor for
short circuits or broken insulation.
Replace any broken parts.
• Reduce the carrier frequency.
• Check the wiring from the upper
controller and make sure that both signals
are set correctly by the controller.
• If the signals are set correctly and the
alarm does not disappear, replace the
drive.
• Check the power supply.
• Make sure that all cables are properly
fixed to the correct terminals.
• Check the output wiring and the motor for
short circuits or broken insulation.
Replace the broken parts.
• Check the machine for damages (gears,
etc.) and repair any broken parts.
• Check the drive parameter settings.
• Check the output contactor sequence.
• Check the surrounding temperature and
install cooling devices if necessary.
• Check the drive cooling fan.
• Clean the heatsink.
• Check the airflow around the heatsink.
• Reduce the motor load.
• Use a motor with external cooling and set
the correct motor in parameter L1-01.
• Check the sequence.
• Check the rated current setting.
• Check the load.
• Make sure that the drive is big enough to
handle the load.
• The overload capability is reduced at low
speeds. Reduce the load or increase the
drive size.