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Code
Name
bb
Baseblock
CrST
Cannot Reset
dEv
Speed Deviation
dv3
Inversion Detection
dv4
Inversion Prevention Detection
dv6
Over Jerk
34
Causes
An external baseblock command was entered
through one of the MFDI terminals Sx, and the
drive output stopped as shown by an external
baseblock command.
The drive received a fault reset command when an
Up/Down command was active.
The load is too heavy.
Acceleration and deceleration ramps are set too fast. Increase the values set in C1-01 to C1-08 [Acceleration/
The dEv detection level settings are incorrect.
The load is locked up.
The holding brake is stopping the motor.
E5-11 [Encoder Z-Pulse Offset] is set incorrectly.
There is a new encoder or the motor rotation
direction changed.
An external force on the load side rotated the motor. • Make sure that the motor is rotating in the correct direction.
Noise interference along the encoder cable.
The encoder cable is disconnected or wired
incorrectly.
The setting for F1-05 [Encoder 1 Rotation
Selection] is the opposite of the direction of motor
rotation.
The drive incorrectly detected the motor magnetic
pole position.
n8-84 [Polarity Detection Current] is too low.
Pole Position Detection failed.
The PG option or the encoder on the motor side is
damaged.
The drive incorrectly detected the motor magnetic
pole position.
An external force on the load side rotated the motor. • Make sure that the motor is rotating in the correct direction.
E5-11 [Encoder Z-Pulse Offset] is set incorrectly.
There is a new encoder or the motor rotation
direction changed.
Noise interference along the encoder cable.
The encoder cable is disconnected or wired
incorrectly.
The drive incorrectly detected the motor magnetic
pole position.
The setting of n8-84 [Polarity Detection Current] is
too low.
Pole Position Detection failed.
The PG option card or the encoder on the motor
side is damaged.
E5-11 [Encoder Z-Pulse Offset] is set incorrectly.
Noise interference in the encoder cable.
The encoder cable is disconnected or wired
incorrectly.
The PG option card or the encoder on the motor
side is damaged.
YASKAWA TOMPYEULA7002A LA700 Series Installation and Operation Instruction
Possible Solutions
Examine the external sequence and timing of the baseblock
command input.
Turn off the Up/Down command then de-energize and re-energize
the drive.
Decrease the load.
Deceleration Ramps].
Adjust F1-10 [Speed Deviation Detection Level] and F1-11
[Speed Deviation Detect DelayTime].
Examine the machine.
Release the holding brake.
Correctly set the value for Δθ to E5-11 as specified by the values
on the motor nameplate.
Do Encoder Tuning.
• Find and repair problems on the load side that cause the motor
to rotate from the load side.
Correctly ground the shielded wire of the encoder cable.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Correctly connect the motor wiring for each phase (U, V, W).
When U6-57 [PolePolarityDeterVal] < 819, increase n8-84
[Polarity Detection Current]. Consult the motor manufacturer for
information about maximum setting values.
Increase n8-84 from the default. Consult the motor manufacturer
for information about maximum setting values.
If you are using an IPM motor, do High Frequency Injection
Auto-Tuning.
Repair the wiring and re-energize the drive, then replace the PG
option card or the PG if the problem continues.
When U6-57 [PolePolarityDeterVal] < 819, set n8-84 [Polarity
Detection Current > default setting.
• 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].
Correctly set the value for Δθ to E5-11 as specified by the values
on the motor nameplate.
Do Encoder Tuning.
Correctly ground the shielded wire of the encoder cable.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
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.
Increase the n8-84 setting from the default. Consult the motor
manufacturer for information about maximum setting values.
If you are using an IPM motor, do High Frequency Injection
Auto-Tuning.
Repair the wiring and re-energize the drive, then replace the PG
option card or the PG if the problem continues.
Correctly set the value for Δθ to E5-11 as specified by the values
on the motor nameplate.
Correctly ground the shielded wire of the encoder cable.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Repair the wiring and re-energize the drive, then replace the PG
option card or the PG if the problem continues.
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