Omron R88M-W60010T User Manual page 361

Troubleshooting
Display Error
a.cb0 Encoder echo-
back error
Multi-turn limit dis-
a.cc0
crepancy
Status when
error occurs
Occurs when the • The encoder wiring is
control circuit
incorrect or the contact is
power supply is
faulty.
turned ON or dur-
• The encoder cable is car-
ing operation.
rying noise that does not
accord with the specifica-
tions.
• The encoder cable is car-
rying noise because the
distance is too long.
• The encoder cable is
crimped, and deteriora-
tion of the insulation is
allowing noise to affect
the signal line.
• The encoder cable is
bundled with, or close to,
lines carrying a large cur-
rent.
• The electric potential of
the FG is fluctuating due
to influence from machin-
ery (such as welders) in
the vicinity of the Servo-
motor.
• Noise is being carried to
the line for signals com-
ing from the encoder.
• The encoder is sub-
jected to excessive vibra-
tion and shock.
• Encoder is defective.
• The Servo Driver board is
defective.
Occurs when the • A Servo Driver parameter
control circuit
is set incorrectly.
power supply is
• The encoder's multi-turn
turned ON.
limit setting was omitted
or changed.
Occurs during • The Servo Driver board is
operation.
defective.
Cause of error
• Correct the encoder wir-
ing.
• For the cable specifica-
tions, us twisted-pair wire
or twisted-pair bound
shielded wire, core wire
of 0.12 mm
of tin-coated soft copper.
• Use a maximum wiring
distance of 20 m.
• Correct the cable installa-
tion.
• Arrange the cable so that
the encoder cable is not
affected by surges.
• Ground the machinery
ground to prevent
branching to the
encoder's FG.
• Implement measures
against noise in the
encoder wiring.
• Reduce machine vibra-
tion or securely mount
the Servomotor.
• Replace the Servomotor.
• Replace the Servo
Driver.
• Correct the setting for
Pn205 (0 to 65,535).
• Change settings when an
alarm occurs.
• Replace the Servo
Driver.
Chapter 5
Countermeasures
2
min., made
5-29