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7 Troubleshooting
EN 44 YASKAWA Europe TOEP C710606 101A - V1000 MMD IP65 Motor Mounted Drive - Quick Start Guide
Ground Fault

• Ground leakage current has exceeded 50%
of the drives rated output current.
• Cable or motor insulation is broken.
• Excessive stray capacitance at drive out-
put.
• Check the output wiring and the motor for
short circuits or broken insulation. Replace
any broken parts.
• Reduce the carrier frequency.
Safe Disable

Both Safe Disable inputs are open. The drive
output is safely disabled and the motor can
not be started.
• Check why the upper controller’s safety
device disabled the drive. Remove the
cause and restart.
• Check the wiring.
• If the Safe Disable function is not utilized
for EN60204-1, stop cat. 0 or for disabling
the drive, the terminals HC, H1, H2 must
be linked.
Safe Disable
Fault

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.
• Check the wiring from the upper controller
and make sure that both signals are set cor-
rectly by the controller.
• If the signals are set correctly and the
alarm does not disappear, replace the drive.
Output Phase
Loss

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).
• Check the motor wiring.
• Make sure all terminal screws in the drive
and motor are properly tightened.
• Check the motor and drive capacity.
Overcurrent

Short circuit or ground fault on the drive out-
put side
The load is too heavy.
The accel./decel. times are too short.
A magnetic contactor was switched at the
output.
• 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.
Heatsink
Overheat
 
Surrounding temperature is too high.
The cooling fan has stopped.
The heatsink is dirty.
The airflow to the heatsink is restricted.
• Check the surrounding temperature and
install cooling devices if necessary.
• Check the drive cooling fan.
• Clean the heatsink.
• Check the airflow around the heatsink.
Motor
Overload

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. • 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.
LED Display AL FLT Cause Corrective Action
or
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