Troubleshooting - YASKAWA A1000 Quick Start Manual

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.
Digital Operator AL FLT
Base Block
bb
Control Fault
CF
Control Circuit
Fault
CPF02 to
CPF24
Control Circuit
Fault
CPF25
Cannot Reset
CrST
Option External
Fault
EF0
External Fault
EF
External Faults
EF1 to EF8
Ground Fault
GF
Safe Disable
Hbb
Safe Disable Fault
HbbF
YASKAWA ELECTRIC TOEP C710616 27D YASKAWA AC Drive - A1000 Quick Start Guide
Cause
The software base block function is assigned to one of
the digital inputs and the input is off. The drive does not
accept Run commands.
The torque limit was reached during deceleration for
longer than 3 s. when in Open Loop Vector control
• The load inertia is too big.
• The torque limit is too low.
• The motor parameters are wrong.
There is a problem in the drive's control circuit.
There is no terminal board connected to the control
board.
Fault reset was input when a Run command was active. Turn off the Run command and reset the drive.
An external fault was tripped by the upper controller via
an option card.
A forward and reverse command were input
simultaneously for longer than 500 ms. This alarm
stops a running motor.
• An external fault was triggered by an external device
via one of the digital inputs S1 to S8.
• 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 output.
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.
7 Troubleshooting
Corrective Action
• Check the digital inputs function selection.
• 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.
• Cycle the drive power supply.
• Initialize the drive.
• Replace the drive if the fault occurs again.
• Check if the terminal board is installed properly.
• Uninstall and Reapply the terminal board.
• Change the drive.
• Remove the fault cause, reset the fault and restart the
drive.
• Check the upper controller program.
• Check the sequence and make sure that the forward
and reverse input are not set at the same time.
• 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 the
ISO13849-1, Category 3 PLd, and IEC61508, SIL2 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 correctly by the
controller.
• If the signals are set correctly and the alarm does not
disappear, replace the drive.
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