3-10
Deviation Counter Overflow
• An alarm will result if the deviation counter overflows.
• This error results with the Servo Driver with pulse-train input.
• The deviation counter will overflow if the motor cannot carry out the command.
Alarm Indication
U Series: A. 31
H Series: E25
M Series: A. L-21
R Series: O. RUN
Probable cause Item to check Countermeasure
The gains are too low. • The motor response is slow.
(Use speed monitor.)
• Adjust the gains.
(Increase the gains.)
• Make feed-forward adjustments
to reduce the number of pulses
accumulated by the deviation
counter.
The gains are too high. • Overshooting is resulting.
(Use speed monitor.)
• Adjust the gains.
(Decrease the gains.)
Parameter setting mistake. • The electronic gear ratio is too
large.
• Fix the electronic gear ratio.
The output torque is insufficient
due to current limitation, which
increase acceleration/deceleration
time.
• The output current of the Servo
Driver is limited with the current
limit value. (Use current monitor,
signal output, and monitor indi-
cator.)
• Increase the current limit value.
• Turn off the current limit input
signal.
The frequency of the command
pulse input is too high.
• The frequency of the command
pulse input is higher than the fre-
quency corresponding to the
maximum allowable rotation
speed.
• Decrease the command speed.
The motor shaft is locked. • The machine system does not
operate smoothly.
• The machine system came to a
halt after colliding with some ob-
ject.
• The output current is at maxi-
mum. (Use the current monitor
or indicator.)
• Perform machine maintenance.
• Repair the machine system.
The load is too heavy.
Acceleration/Deceleration time is
too short.
• The Servo Driver is generating
its maximum torque at decelera-
tion or acceleration time. (Use
current monitor.)
• Decrease the load.
• Increase acceleration/decelera-
tion time.
A disconnection or a mistake in
wiring of the power lines.
• There is a disconnection or a
mistake in the wiring of the pow-
er lines.
• Connect the power lines correct-
ly.
Abnormal encoder signal lines.
Abnormal resolver signal lines.
• The signal lines are discon-
nected.
• The signal lines are short-cir-
cuited.
* Check the resistance of the
cable alone.
• Replace the encoder cable.
Abnormal motor. • The phase-to-phase resistance
of the motor is different from the
coil resistance.
• Replace the motor.
Servo Driver Errors Chapter 3
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