YASKAWA Sigma-7 SGD7S Series - Page 655

Problem Possible Cause Confirmation Correction Reference
The encoder was sub-
jected to excessive
vibration or shock.
Turn OFF the power
supply to the servo
system. Check to see
if vibration from the
machine occurred.
Check the Servomotor
installation (mounting
surface precision,
securing state, and
alignment). Check the
linear encoder instal-
lation (mounting sur-
face precision and
securing method).
Reduce machine
vibration. Improve the
mounting state of the
Servomotor or linear
encoder.
–
A failure occurred in
the encoder.
– Turn OFF the power
supply to the servo
system. Replace the
Servomotor or linear
encoder.
–
A failure occurred in
the SERVOPACK.
– Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
–
Host Controller Multi-
turn Data or Absolute
Encoder Position Data
Reading Error
Check the error detec-
tion section of the
host controller.
Correct the error
detection section of
the host controller.
–
Check to see if the
host controller is exe-
cuting data parity
checks.
Perform parity checks
for the multiturn data
or absolute encoder
position data.
–
Check for noise inter-
ference in the cable
between the SERVO-
PACK and the host
controller.
Implement counter-
measures against
noise and then per-
form parity checks
again for the multiturn
data or absolute
encoder position data.
–
Overtravel Occurred The P-OT/N-OT (For-
ward Drive Prohibit or
Reverse Drive Pro-
hibit) signal was input.
Check the external
power supply (+24 V)
voltage for the input
signals.
Correct the external
power supply (+24 V)
voltage for the input
signals.
–
Check the operating
condition of the over-
travel limit switches.
Make sure that the
overtravel limit
switches operate cor-
rectly.
–
Check the wiring of
the overtravel limit
switches.
Correct the wiring of
the overtravel limit
switches.
Ä Chap. 6.11 ‘Over-
travel and Related
Settings’ page 160
Check the settings of
the overtravel input
signal allocations
(Pn50A/ Pn50B).
Set the parameters to
correct values.
Ä Chap. 6.11 ‘Over-
travel and Related
Settings’ page 160
Sigma-7 Series SERVOPACKs
Maintenance
Troubleshooting Based on the Operation and Conditions of the Servomotor
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