6.4 Faults
340 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
CPF25 Terminal Board not
Connected
The terminal board is not correctly
connected to the drive.
1. De-energize the drive.
2. Correctly connect the terminal board to the
drive.
3. Re-energize the drive.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
dEv Speed Deviation The load is too heavy. Decrease the load.
Acceleration and deceleration times are
set too short.
Increase the values set in C1-01 to C1-08
[Acceleration/Deceleration Time].
The dEv detection level settings are
incorrect.
Adjust F1-10 [Speed Deviation Detection Level]
and F1-11 [Speed Deviation Detect DelayTime].
The load is locked up. Examine the machine.
The holding brake is stopping the motor. Release the holding brake.
Note:
• The drive detects this error if the difference between the detected speed and the speed reference is more than the setting of F1-10 for
longer than F1-11.
• Do a Fault Reset to clear the fault.
• If the drive detects this error, the drive will operate the motor as specified by the stopping method set in F1-04 [Speed Deviation
Detection Select].
Code Name Causes Possible Solutions
dv1 Z Pulse Fault The encoder option card or the encoder
on the motor side is damaged.
The encoder cable is disconnected or
wired incorrectly.
1. Repair wiring errors and connect disconnected
wires. Correctly ground the shielded wire of the
encoder cable.
2. Re-energize the drive
3. 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.
Note:
• The drive detects this error if it does not detect a Z pulse during one motor rotation.
• Do a Fault Reset to clear the fault.
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.
Repair wiring errors and connect disconnected
wires. Correctly ground the shielded wire of the
encoder cable.
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 it does not detect a Z pulse during one motor rotation.
• 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
incorrectly wired.
Examine for wiring errors or disconnected wires in
the encoder cable, and repair problems.
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