YASKAWA L1000H - Troubleshooting

8 Troubleshooting
YASKAWA Europe TOEP C710616 92D AC Drive L1000H Quick Start Guide 38
8 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.
The table below lists the most important alarms and faults only. Please refer to the Technical Manual for a complete list.
Digital Operator AL FLT Possible Cause Corrective Action
Drive Baseblock
(bb)

The software baseblock function is assigned to one of
the digital inputs and the input is off. The drive does not
accept Up/Down commands during this time.
• Check the functions assigned to the digital input
terminals.
• Check the upper controller sequence.
Control Fault
(CF)

The torque limit was reached during deceleration for
longer than 3 s and one of the following was true:
• the load inertia is too big.
• the torque limit is too low.
• the motor parameters are set incorrectly.
• Check the load.
• Set the torque limit to the most appropriate setting
(L7-01 through L7-04).
• Check the motor parameters settings.
Control Circuit
Fault
(CPF02) to
(CPF25)
 There is a problem in the drive’s control circuit.
• Cycle the drive power supply.
• Initialize the drive.
• Replace the drive if the fault occurs again.
A/D Conversion
Error
(CPF35)

An A/D conversion error or control circuit error
occurred.
• Cycle power to the drive.
• Replace the control board or the entire drive if the
problem continues.
Cannot Reset
(CrST)

Fault reset was input when the Up or Down command
was active.
Turn off the Up and Down command and reset the
drive.
Up/Down
Command Error
(EF)

The Up and Down command were input simultaneously
for longer than 500 ms.
Check the sequence and make sure that the Up and
Down command are not enabled at the same time.
External Faults
(input terminal S3
to S8)
(EF03) to (EF08)

• An external fault was triggered by an external device
via one of the digital inputs (S3 to S8).
• The digital inputs are set incorrectly.
• Find out why the device tripped the EF. Remove the
cause and reset the fault.
• Check the functions assigned to the digital inputs.
Ground Fault
(GF)

• Ground leakage current has exceeded 50% of the
drives rated output current.
• Cable or motor insulation is broken.
• Excessive stray capacitance at drive output.
• Check the output wiring and the motor for short
circuits or broken insulation. Replace any broken
parts.
• Reduce the carrier frequency.
Safe Disable
(Hbb)

Both Safe Disable inputs are open. The drive output is
safely disabled and the motor cannot be started.
• Check why the upper controller’s safety device
disabled the drive. Remove the cause and restart.
• Check the wiring. Terminals HC, H1, and H2 must be
linked if the Safe Disable function is not utilized.
Safe Disable
Circuit Fault
(HbbF)

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 handled correctly.
• If the signals are set correctly and the alarm does not
disappear, replace the drive.
Output Phase Loss
(LF)

• Output cable is disconnected or the motor winding is
damaged.
• Drive output wires are loose.
• Motor is too small (less than 5% of drive current).
• Check the power supply.
• Make sure that all cables are properly connected to
the correct terminals.