8.4 Troubleshooting for Malfunction without Alarm Display
155
Overtravel (OT)
(Movement
over the zone
specified by the
host controller)
Excessive noise interfer-
ence to the encoder cable
Check if the encoder cable
is not bundled with or too
closed to high-voltage lines.
Change the encoder cable
layout so that no surge volt-
age is applied.
FG potential varies by influ-
ence of machines such as
welder installed on the ser-
vomotor side.
Check if the machine is cor-
rectly grounded (check for
faulty grounding).
Ground the machine sepa-
rately from PG side FG.
SERVOPACK pulse count
error by influence of noise
Check if the signal line from
the encoder is not influ-
enced by noise.
Take measures against
noise for the encoder wiring.
Excessive vibration and
shock to the encoder
Check if the vibration from
the machine occurred or if
the servomotor installation
is correct (check for mount-
ing surface accuracy, fixing,
and alignment).
Reduce the machine vibra-
tion, or secure the servomo-
tor installation.
The encoder is faulty.
The encoder is faulty.
Replace the servomotor.
The SERVOPACK is faulty.
The SERVOPACK is faulty.
Replace the SERVOPACK.
Position error
(without alarm)
Unsecured coupling
between machine and ser-
vomotor
Check if the coupling
between the machine and
servomotor is not displaced.
Secure the coupling
between the machine and
servomotor.
The encoder is faulty (pulse
count does not change).
Check if the encoder is
faulty.
Replace the servomotor.
(cont’d)
Malfunction
Cause
Inspection
Corrective Actions
TOEP_C710806_03A_1_0.book Seite 155 Montag, 2. Juli 2007 3:55 15
