YASKAWA SGD7S series Product Manual page 540

12.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Position
Deviation
(without
Alarm)
Servomotor
Overheated
12-64
Possible Cause
If reference pulse input multi-
plication switching is being
used, noise may be causing
the I/O signals used for this
function (/PSEL and /PSELA)
to be falsely detected.
Noise interference occurred
because an I/O signal cable
is too long.
An encoder fault occurred.
(The pulse count does not
change.)
A failure occurred in the
SERVOPACK.
The surrounding air tempera-
ture is too high.
The surface of the Servomo-
tor is dirty.
There is an overload on the
Servomotor.
Polarity detection was not
performed correctly.
Confirmation
Check the I/O signal
cables to see if they sat-
isfy specifications. Use
shielded twisted-pair
cables or screened
twisted-pair cables with
conductors of at least
2
0.12 mm (stranded wire).
Check the lengths of the
I/O signal cables.
–
–
Measure the surrounding
air temperature around
the Servomotor.
Visually check the surface
for dirt.
Check the load status
with a monitor.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
Continued from previous page.
Correction Reference
Use cables that satisfy
–
the specifications.
The I/O signal cables
must be no longer than
–
3 m.
Replace the Servomo-
–
tor or linear encoder.
Replace the SERVO-
–
PACK.
Reduce the surround-
ing air temperature to
–
40°C or less.
Clean dirt, dust, and oil
–
from the surface.
If the Servomotor is
overloaded, reduce the
load or replace the
Servo Drive with a
–
SERVOPACK and Ser-
vomotor with larger
capacities.
Correct the settings for
the polarity detection-
–
related parameters.