6.4 Fault Detection
356 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Digital Operator Display Fault Name
dv2
Z Pulse Noise Fault Detection
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.
Cause Possible Solution
Electrical signal interference along the PG cable. Separate the PG cable lines from the source of the noise (very possibly drive output wiring).
PG cable is not wired properly. Rewire the PG encoder and make sure all shielded lines are properly grounded.
PG option card or the PG encoder is damaged. If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Digital Operator Display Fault Name
dv3
Inversion Detection
The torque reference and acceleration are in opposite directions from one another (one is in reverse and the other is forward)
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.
Cause Possible Solution
The Z pulse offset is not set properly to E5-11.
Set the value for Δθ 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)
An external force on the load side has caused the motor
to move.
• 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.
Electrical signal interference along the PG cable
affecting the A or B pulse.
Rewire the PG encoder and make sure all lines including shielded line are properly connected.
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.
Make sure motor lines for each phase (U, V, W) are connected properly.
Digital Operator Display Fault Name
dv4
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.
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.
Cause Possible Solution
The Z pulse offset is not set properly to E5-11.
• Set the value for Δθ 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)
Electrical signal interference along the PG cable
affecting the A or B pulse.
• 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.
PG encoder is disconnected, not wired properly, or the
PG option card or PG itself is damaged.
• 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.
Digital Operator Display Fault Name
dv7
Polarity Judge Timeout
Cause Possible Solution
Disconnection in the motor coil winding. • 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 and Torque Specifications on page 105.
Loose output terminals.
Digital Operator Display Fault Name
dWAL
DriveWorksEZ Fault
dWFL
Cause Possible Solution
Fault output by DriveWorksEZ Correct whatever caused the fault.
Digital Operator Display Fault Name
dWF1
EEPROM Memory DriveWorksEZ Data Error
There is an error in the DriveWorksEZ program saved to EEPROM.
Cause Possible Solution
Problem with EEPROM data. Reinitialize the drive (A1-03 = 2220, 3330) and then download the DriveWorksEZ program again.
There is an error in EEPROM control circuit.
• 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.
Digital Operator Display Fault Name
E5
MECHATROLINK Watchdog Timer Error
The watchdog has timed out.
Cause Possible Solution
Data has not been received from the PLC, triggering the
watchdog timer.
Execute DISCONNECT or ALM_CLR, then issue a CONNECT command or SYNC_SET command and proceed to phase 3.
SIEP_C710636_02B_1_0.book 356 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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