Omron R88M-W60010T User Manual page 365

Troubleshooting
5-3-2 Error Diagnosis Using Warning Indicators
Display Error
Deviation counter
a.900
overflow
Deviation counter
a.901
overflow at Servo-
ON
Status when
error occurs
Occurs during nor- • The Servo Driver board is
mal operation.
defective.
• The Servomotor's U, V,
and W wiring is incorrect
(faulty connections).
• Servo Motor gain is
poorly adjusted.
• The position command
pulse frequency is too
high.
• A parameter setting
(Pn520: Deviation
counter overflow level) is
incorrect.
• The load conditions
(torque, inertia) do not
conform to the Servomo-
tor specifications.
Occurs when the • Position deviation pulses
Servo is turned
have accumulated exces-
ON.
sively with the Servo
OFF.
• Position deviation pulses
were not set to be
cleared with the Servo
OFF, and the Servomo-
tor was operated from
outside.
Cause of error
• Replace the Servo
Driver.
• Correct the Servomotor
wiring.
• Correct the encoder wir-
ing.
• Increase the speed loop
gain (Pn100) and the
position loop gain
(Pn102).
• Increase/decrease the
position command pulse
frequency slowly.
• Use the smoothing func-
tion.
• Check the electronic gear
ratio.
• Set a value other than
zero for Pn520.
• Check the load and the
Servomotor capacity.
• Set so that the Servomo-
tor does not operate with
the Servo OFF.
• Set so that position devi-
ation pulses are cleared
when the Servo is OFF.
• Correct the detection
level.
Chapter 5
Countermeasures
5-33