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8
Troubleshooting
General Fault and Alarms
Faults and alarms indicate problems in the drive or in the machine.
The drive indicates that an alarm has occurred with a code on the data display screen and a
flashing ALM LED. The drive output may be shut off depending on the alarm.
The drive indicates that a fault has occurred with a code on the data display screen and a lit
ALM LED. The drive output is always switched off immediately and the motor coasts to
stop.
To remove an alarm or reset a fault, first figure out what cause the problem, take corrective
action, and finally reset the drive by pushing the RESET key on the operator or by cycling
the power supply.
The table below lists the most important alarms and faults only. Please refer to the Technical
Manual for a complete list.
LED Display AL FLT
Baseblock
bb
Control Fault
CF
Control Circuit
Fault
CPF02 to
CPF24
Cannot Reset
CrST
YASKAWA ELECTRIC YEG-TOEP-C710606-50A-1-0YaskawaACDrives-L1000VQuickStartGuide
Possible Cause
The software baseblock function is assigned
to one of the digital inputs and the output is
off. The drive does not accept Up/Down
commands during this time.
The torque limit was reached during deceler-
ation for longer than 3 s and one of the fol-
lowing was true:
• the load inertia is too big.
• the torque limit is too low.
• the motor parameters are set incorrectly.
There is a problem in the drive's control cir-
cuit.
Fault reset was input when the Up or Down
command was active.
8 Troubleshooting
Corrective Action
• Check the functions assigned to the digital
input terminals.
• Check the upper controller sequence.
• Check the load.
• Set the torque limit to the most appropriate
setting (L7-01 through L7-04).
• Check the motor parameters settings.
• Cycle the drive power supply.
• Initialize the drive.
• Replace the drive if the fault occurs again.
• Turn off the Up and Down command and
reset the drive.
• Wait until the fault restart time has expired
45
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