5.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
5-44
Servomotor
Does Not
Start
The FSTP (Forced Stop
Input) signal is still OFF.
Check the FSTP signal.
•
Turn ON the FSTP signal.
•
If you will not use the
function to force the
motor to stop, set Pn516
= n.
X (FSTP
(Forced Stop Input) Sig-
nal Allocation) to disable
the signal.
*
A failure occurred in the
SERVOPACK.
–
Turn OFF the power supply
to the servo system.
Replace the SERVOPACK.
–
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in
the Servomotor wiring.
Turn OFF the power supply
to the servo system.
Check the wiring.
Wire the Servomotor cor-
rectly.
–
There is a mistake in
the wiring of the
encoder or Serial Con-
verter Unit.
Turn OFF the power supply
to the servo system.
Check the wiring.
Wire the Serial Converter
Unit correctly.
–
Servomotor
Speed Is
Unstable
There is a faulty con-
nection in the Servo-
motor wiring.
Turn OFF the power supply
to the servo system.
The connector connections
for the power line (U, V, and
W phases) and the encoder
or Serial Converter Unit may
be unstable. Check the wir-
ing.
Tighten any loose termi-
nals or connectors and
correct the wiring.
–
Servomotor
Moves with-
out a Refer-
ence Input
A failure occurred in the
SERVOPACK.
–
Turn OFF the power supply
to the servo system.
Replace the SERVOPACK.
–
Dynamic
Brake Does
Not Operate
The setting of Pn001 =
n.
X (Servo OFF
or Alarm Group 1 Stop-
ping Method) is not
suitable.
Check the setting of Pn001
= n.
X.
Set Pn001 = n.
X
correctly.
–
The dynamic brake
resistor is discon-
nected.
Check the moment of iner-
tia, motor speed, and
dynamic brake frequency of
use. If the moment of inertia,
motor speed, or dynamic
brake frequency of use is
excessive, the dynamic
brake resistance may be
disconnected.
Turn OFF the power supply
to the servo system.
Replace the SERVOPACK.
To prevent disconnection,
reduce the load.
–
There was a failure in
the dynamic brake
drive circuit.
–
Turn OFF the power supply
to the servo system.
There is a defective com-
ponent in the dynamic
brake circuit. Replace the
SERVOPACK.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference
