YASKAWA GA700 Technical Manual page 276

6.4 Fault
Code Name
dv1 Z Pulse Fault
Note:
• Detected if a Z pulse is not detected during a single rotation of the motor.
• Perform Fault Reset to clear the fault.
Code Name
dv2 Z Pulse Noise Fault
Detection
Note:
• Detected if Z pulses are detected two or more times during a single rotation of the motor.
• Perform Fault Reset to clear the fault.
Code Name
dv3 Inversion Detection
Note:
• Detected if the torque reference and acceleration are in opposite directions and the speed reference and actual motor speed differ by
more than 30% for the number of times set to F1-18 [Deviation 3 Detection Selection].
• Perform Fault Reset to clear the fault.
Code Name
dv4 Inversion Prevention
Detection
276
Cause
The PG option card or the encoder on
the motor side is damaged.
The encoder cable is improperly wired
or disconnected.
Cause
Noise interference along the encoder
cable
The encoder cable is improperly wired
or disconnected.
The PG option card or the encoder on
the motor side is damaged.
Cause
Parameter E5-11 [Encoder Z Pulse
Offset] is not set properly.
The encoder was replaced or the
direction of motor rotation changed.
An external force on the load side
caused the motor to move.
Noise interference along the encoder
cable
The encoder cable is improperly wired
or disconnected.
The setting for F1-05 [PG 1 Rotation
Selection] is the opposite of the
direction of motor rotation.
The PG option card or the encoder on
the motor side is damaged.
Cause
An external force on the load side
caused the motor to move.
Parameter E5-11 [Encoder Z Pulse
Offset] is not set properly.
The encoder was replaced or the
direction of motor rotation changed.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
1. Check for any wiring errors or disconnected
wires in the encoder cable, and fix any
problems. Properly ground the shielded wire of
the encoder cable.
2. Re-energize the drive and check if the fault still
remains.
3. If the fault persists, replace the PG option card
or the encoder.
Possible Solution
Separate the encoder cable from the source of the
noise such as the drive output line.
Check for any wiring errors or disconnected wires
in the encoder cable, and fix any problems.
Properly ground the shielded wire of the encoder
cable.
Replace the PG option card or the encoder if the
problem continues even after fixing the wiring and
re-energizing the drive.
Possible Solution
Properly set the value for Δθ to E5-11 as specified
on the motor nameplate.
Perform Z Pulse Offset Tuning.
• Make sure the motor is rotating in the proper
direction.
• Identify and fix any problems on the load side
causing the motor to rotate from the load side.
Properly ground the shielded wire of the encoder
cable.
Check for any wiring errors or disconnected wires
in the encoder cable, and fix any problems.
Properly connect the motor wiring for each phase
(U, V, W).
Replace the PG option card or the encoder if the
problem continues even after all counter-measures
have been taken and the drive re-energized.
Possible Solution
• Make sure the motor is rotating in the proper
direction.
• Identify and fix any problems on the load side
causing the motor to rotate from the load side.
• For applications in which the motor is rotated
from the load side in the opposite direction of
the speed reference, disable detection of this
fault. This fault will not be detected if F1-19 = 0
[Deviation 4 Detection Selection = Disabled].
Properly set the value for Δθ to E5-11 as specified
on the motor nameplate.
Perform Z Pulse Offset Tuning.