3-7
Overload
Probable cause
Item to check
Countermeasure
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.
A disconnection or a mistake in
the wiring of power lines.
·
There is a disconnection or a
mistake in the wiring of power
lines.
·
Connect the power lines correct-
ly.
The motor shaft is damaged.
·
The motor shaft does not rotate
smoothly without a load.
* Make sure that the lead wires
of the motor do not touch
together.
·
The motor shaft bearing is rusty.
·
Replace the motor.
Abnormal motor current phase
angle.
·
The output current with servo-
lock is more than 110% of the
rated current without influence of
external force.
·
No overload results if the Servo
Driver or motor is replaced.
·
Replace the Servo Driver.
·
Replace the motor.
Note
The following may cause motor shaft damage.
S
An abnormal thrust or radial load is imposed on the shaft.
S
There is corrosive gas around the motor.
In the above cases, the same problem will occur even after the motor is replaced. Check the causes
of motor damage, take proper countermeasures against it, and then replace the motor.
Servo Driver Errors
Chapter 3
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