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7 Troubleshooting
YASKAWA Europe TOEP C710606 15C YASKAWA AC Drive - V1000 Quick Start Guide EN 31
7 Troubleshooting
General Fault and Alarms
Faults and alarms indicate problems in the drive or in the machine.
An alarm is indicated by a code on the data display and the flashing ALM LED. The drive
output is not necessarily switched off.
A fault is indicated by a code on the data display and the ALM LED is on. The drive output
is always switched off immediately and the motor coast to stop.
To remove an alarm or reset a fault, trace the cause, remove it and reset the drive by pushing
the Reset key on the operator or cycling the power supply.
This lists up the most important alarms and faults only. Please refer to the Technical Manual
for a complete list.
LED Display AL FLT Cause Corrective Action
Base Block
The software base block function is assigned
to one of the digital inputs and the input is
off. The drive does not accept Run com-
mands.
• Check the digital inputs function selection.
• Check the upper controller sequence.
Control Fault
The torque limit was reached during deceler-
ation for longer than 3 sec. when in Open
Loop Vector control
• The load inertia is too big.
• The torque limit is too low.
• The motor parameters are wrong.
• Check the load.
• Set the torque limit to the most appropriate
setting (L7-01 through L7-04).
• Check the motor parameters.
Control Circuit
Fault
There is a problem in the drive’s control cir-
cuit.
• Cycle the drive power supply.
• Initialize the drive.
• Replace the drive if the fault occurs again.
Control Circuit
Fault
There is no terminal board connected to the
control board.
• Check if the terminal board is installed
properly.
• Uninstall and Reapply the terminal board.
• Change the drive.
Cannot Reset
Fault reset was input when a Run command
was active.
Turn off the Run command and reset the
drive.
Option
External Fault
An external fault was tripped by the upper
controller via an option card.
• Remove the fault cause, reset the fault and
restart the drive.
• Check the upper controller program.
External Fault
A forward and reverse command were input
simultaneously for longer than 500 ms. This
alarm stops a running motor.
• Check the sequence and make sure that the
forward and reverse input are not set at the
same time.
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