YASKAWA GA700 Series

Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061705H GA700 Series Technical Manual 327
Code Name Causes Possible Solutions
The PG option or the encoder on the motor side is
damaged.
Repair the wiring and re-energize the drive, then replace the PG
option card or the PG if the problem continues.
The drive incorrectly detected the motor magnetic
pole position.
When U6-57 [PolePolarityDeterVal] < 819, set n8-84 [Polarity
Detection Current > default setting.
Note:
• The drive detects this error if:
–the torque reference and acceleration are in opposite directions.
–the speed reference and actual motor speed are more than 30% different for the number of times set to F1-18 [Deviation 3 Detection Selection].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dv4 Inversion Prevention Detection
An external force on the load side rotated the motor. • Make sure that the motor is rotating in the correct direction.
• Find and repair problems on the load side that cause the motor
to rotate from the load side.
• Disable detection of this fault for applications that rotate the
motor from the load side in the opposite direction of the speed
reference. The drive will not detect this fault if F1-19 = 0
[Deviation 4 Detection Selection = Disabled].
E5-11 [Encoder Z-Pulse Offset] is set incorrectly. Correctly set the value for Δθ to E5-11 as specified by the values
on the motor nameplate.
There is a new encoder or the motor rotation
direction changed.
Do Z Pulse Offset Tuning.
Noise interference along the encoder cable. Correctly ground the shielded wire of the encoder cable.
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
The drive incorrectly detected the motor magnetic
pole position.
If the value for U6-57 [PolePolarityDeterVal] is lower than 819,
increase the value set in n8-84 [Polarity Detection Current].
Consult the motor manufacturer for information about maximum
setting values.
The setting of n8-84 [Polarity Detection Current] is
too low.
Increase the n8-84 setting from the default. Consult the motor
manufacturer for information about maximum setting values.
Pole Position Detection failed. If you are using an IPM motor, do High Frequency Injection
Auto-Tuning.
The PG option card or the encoder on the motor
side is damaged.
Repair the wiring and re-energize the drive, then replace the PG
option card or the PG if the problem continues.
Note:
• The drive detects this error if the pulses in the opposite direction of the speed reference are more than the value set in F1-19.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dv7 Polarity Judge Timeout
There is a disconnection in the motor coil winding. Measure the motor line-to-line resistance and replace the motor if
a coil is disconnected.
The screws on the drive output terminals are loose. Tighten the terminal screws to the correct tightening torque.
Note:
• The drive detects this error if it cannot detect polarity in a pre-set length of time.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dWF1
EEPROM Memory DWEZ Data
Error
There is an error in the EEPROM peripheral circuit. • Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
There is a problem with the EEPROM data. Set A1-03 = 2220, 3330 [Initialize Parameters = 2-Wire
Initialization, 3-Wire Initialization] to initialize the drive, then
upload the DriveWorksEZ project to the drive again.
Note:
• The drive detects this error if there is an error in the DriveWorksEZ program that was saved to EEPROM.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dWF2 DriveWorksEZ Fault 2
There was a fault in the DriveWorksEZ program. Examine the DriveWorksEZ program and remove the cause of the
fault. This is not a drive fault.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dWF3 DriveWorksEZ Fault 3
There was a fault in the DriveWorksEZ program. Examine the DriveWorksEZ program and remove the cause of the
fault. This is not a drive fault.
Note:
Do a Fault Reset to clear the fault.