YASKAWA GA800

2.4 Fault
90 YASKAWA TOEPYAIGA8001B GA800 Drive Maintenance & Troubleshooting
Code Name Causes Possible Solutions
dv2 Z Pulse Noise Fault Detection
Noise interference along the encoder cable. Isolate the encoder cable from the drive output line or a different
source of electrical interference.
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems. Correctly ground the shielded wire of
the encoder cable.
The drive is operating a motor with 24 or more poles
at zero speed.
• Set F1-46 = 1 [dv2 Detection Method Selection =
MechanicalAngle Detection Method].
• Increase F1-17 [Deviation 2 Detection Selection].
• Increase F1-47 [Deviation 2 Detection Level].
Note:
If you change the setting of F1-47, the sensitivity of detection
for dv2 can decrease.
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 or the encoder if the problem continues.
Note:
• The drive detects this error if it detects more than one Z pulse per rotation for the number of rotations set in F1-17 [Deviation 2 Detection Selection].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dv3 Inversion Detection
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.
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.
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 setting for F1-05 [Encoder 1 Rotation Selection]
is the opposite of the direction of motor rotation.
Correctly connect the motor wiring for each phase (U, V, W).
The drive incorrectly detected the motor magnetic
pole position.
When U6-57 [PolePolarityDeterVal] < 819, increase n8-84
[Polarity Detection Current]. Consult the motor manufacturer for
information about maximum setting values.
n8-84 [Polarity Detection Current] is too low. Increase n8-84 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 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.