Troubleshooting
7
7.4 Faults
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 257
Code Name Causes Possible Solutions
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 [Enc ZPulse 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.
The setting for F1-05 [Enc1 Rotat Selection] 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 [Dev3 Mode 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
[Dev4 Mode Selection = Disabled].
E5-11 [Enc ZPulse 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
E5
MECHATROLINK Watchdog
Timer Err
The drive detected a watchdog circuit exception
while it received data from the controller.
Examine the MECHATROLINK cable connection. If this error
occurs frequently, examine the wiring and decrease the effects of
electrical interference as specified by these manuals:
• MECHATROLINK-II Installation Guide (MECHATROLINK
Members Association, manual number MMATDEP011)
• MECHATROLINK-III Installation Guide (MECHATROLINK
Members Association, manual number MMATDEP018)
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the stop method set in F6-25 [MLII Watchdog Error Sel].
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