YASKAWA L1000H Quick Start Manual page 41

LED Display AL FLT
External Faults
 
to
Ground Fault

Safe Disable

Safe Disable
Fault

Output Phase
Loss

Overcurrent

Heatsink
Overheat
 
or
Motor
Overload

YASKAWA Europe TOEP C710606 91B AC Drive L1000H - Quick Start Guide
Cause
• An external fault was triggered by an exter-
nal 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 out-
put.
Both Safe Disable inputs are open. The drive
output is safely disabled and the motor can
not be started.
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 out-
put 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.
7 Troubleshooting
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 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.
• 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.
• Check the motor wiring.
• Make sure all terminal screws in the drive
and motor are properly tightened.
• Check the motor and drive capacity.
• 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.
EN 41