Troubleshooting
6
6.4 Faults
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 341
Code Name Causes Possible Solutions
The setting for F1-05 [No Alarm
Display] is the opposite of the direction
of motor rotation.
Correctly connect the motor wiring for each phase
(U, V, W).
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 encoder if the
problem continues.
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
moved 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
incorrectly wired.
Examine for wiring errors or disconnected wires in
the encoder cable, and repair problems.
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 encoder 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.
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