YASKAWA A1000 Technical Manual page 339

Digital Operator Display
Cause
PG encoder is not connected, not wired properly, or is
damaged.
Digital Operator Display
Cause
Electrical signal interference along the PG cable.
PG cable is not wired properly.
PG option card or the PG encoder is damaged.
Digital Operator Display
Cause
The Z pulse offset is not set properly to E5-11.
An external force on the load side has caused the motor
to move.
Electrical signal interference along the PG cable
affecting the A or B pulse.
PG encoder is disconnected, not wired properly, or the
PG option card or PG itself is damaged.
Rotational direction for the PG encoder set to F1-05 is
the opposite of the order of the motor lines.
Digital Operator Display
Cause
The Z pulse offset is not set properly to E5-11.
Electrical signal interference along the PG cable
affecting the A or B pulse.
PG encoder is disconnected, not wired properly, or the
PG option card or PG itself is damaged.
Digital Operator Display
Cause
Disconnection in the motor coil winding.
Loose output terminals.
Digital Operator Display
Cause
Fault output by DriveWorksEZ
Digital Operator Display
Cause
Problem with EEPROM data.
There is an error in EEPROM control circuit.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Z Pulse Fault
dv1
The motor turned one full rotation without the Z pulse being detected.
Note: Available in CLV/PM control mode only.
• Make sure the PG encoder is properly connected and all shielded lines are properly grounded.
• If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Z Pulse Noise Fault Detection
dv2
The Z pulse is out of phase by more than 5 degrees for the number of times specified in parameter F1-17.
Note: Available in CLV/PM control mode only.
Separate the PG cable lines from the source of the noise (very possibly drive output wiring).
Rewire the PG encoder and make sure all shielded lines are properly grounded.
If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Inversion Detection
The torque reference and acceleration are in opposite directions from one another (one is in reverse and the other is forward)
dv3
while at the same time the speed reference and actual motor speed differ by over 30% for the number of pulses set to F1-18.
Note: Available in CLV/PM control mode only.
Set the value for  to E5-11 as specified on the motor nameplate. Replacing the PG encoder or changing the application so that
the motor rotates in reverse instead requires readjustment of the Z pulse offset. (T2-01 = 3)
• Make sure the motor is rotating in the right direction.
• Look for any problems on the load side that might be causing the motor to rotate in the opposite direction.
Rewire the PG encoder and make sure all lines including shielded line are properly connected.
Make sure motor lines for each phase (U, V, W) are connected properly.
Inversion Prevention Detection
Pulses indicate that the motor is rotating in the opposite direction of the speed reference. Set the number of pulses to trigger
inverse detection to F1-19.
dv4
Note: 1. Disable inverse detection in applications where the motor may rotate in the opposite direction of the speed reference.
Setting F1-19 to 0 disables this feature.
2. Available in CLV/PM control mode only.
• Set the value for  to E5-11 as specified on the motor nameplate.
• If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself. Replacing the PG
encoder or changing the application so that the motor rotates in reverse instead requires readjustment of the Z-pulse offset.
(T2-01 = 3)
• Make sure the motor is rotating in the correct direction.
• Look for any problems on the load side that might be causing the motor to rotate in the opposite direction.
• Rewire the PG encoder and make sure all lines including shielded line are properly connected.
• If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Polarity Judge Timeout
dv7
• Measure the motor line-to-line resistance and replace the motor if the motor coil winding is open.
• Check for loose terminals. Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size on page
dWAL
DriveWorksEZ Fault
dWFL
Correct whatever caused the fault.
EEPROM Memory DriveWorksEZ Data Error
dWF1
There is an error in the DriveWorksEZ program saved to EEPROM.
Reinitialize the drive (A1-03 = 2220, 3330) and then download the DriveWorksEZ program again.
• Turn the power off and check the connection between the control board and the drive.
• If the problem continues, replace either the control board or the entire drive and then download the DriveWorksEZ program.
For instructions on replacing the control board, contact YASKAWA or your nearest sales representative.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
85.
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
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