3-10
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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