Omron OMNUC FND Series User Manual page 219

Application
Symptom Probable cause
The position is
The point number input is incor-
slipping. g
rect.
The position data (Pd
ting is incorrect.
The minimum setting unit
(PP-01) or pulse rate (PP-02,
03) setting is incorrect.
The compensation (PP-08, 09)
setting is incorrect.
Dedicated lines are not being
used for the encoder/resolver.
The operation mode for the
point number being executed is
incorrect.
The coupling connecting the
motor shaft to the mechanical
system is loose.
The belt is loose.
During an origin search, the
motor sensor's Z-phase position
and the origin proximity OFF
position are too close.
The motor The deceleration stop (STOP)
stops during g
input turned OFF.
operation. ti
The alarm reset (RESET) input
turned ON.
The CWL/CCWL input turned
OFF (when the alarm selection
(PP-25) is
The software limit is being
detected (when the alarm selec-
ti (PP 25) i 0 )
tion (PP-25) is 0 ).
The motor The applicable motor (UP-02)
operates
setting is incorrect.
momentarily, t il
The motor's power lines and the
but then it stops
encoder/resolver lines are wired
operating.
incorrectly.
Motor operation The motor's power lines and the
is unstable. encoder/resolver lines are wired
incorrectly.
The coupling connecting the
motor shaft to the mechanical
system is eccentric, and screws
may be loose.
Gain is wrong.
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Use the Check Mode to check
the point number input.
) set- Check the position data
(Pd
Check the minimum setting unit
(PP-01) and pulse rate (PP-02,
03) settings.
Check the compensation
(PP-08, 09) setting.
Check the encoder/resolver
lines.
Check the operation mode
(Pd
Check the mechanical system.
Repeat the origin search and
check whether the search com-
pletion position is different.
Use the Check Mode to check
the input.
Use the Check Mode to check
the input.
Use the Check Mode to check
the input.
0).
Use the Monitor Mode to check
(
the present position.
Check the software limits
(PP-10, 11, 12, 13).
Check the applicable motor
(UP-02) setting.
Check the wiring of the motor's
power lines and the encoder/re-
solver lines.
Check the wiring of the motor's
power lines and the encoder/re-
solver lines.
Check the mechanical system.
Rotate the motor with no load
(disconnected from the mechan-
ical system).
---
Items to check
Correctly set the point number
input.
Correctly set the position data
) setting. (Pd
Correctly set the minimum set-
ting unit and pulse rate settings.
Correctly set the compensation
(PP-08, 09).
Replace the encoder/resolver
lines with dedicated lines.
Correctly set the operation
r) setting. mode (Pd
Check and adjust the machin-
ery.
Disconnect the motor from the
mechanical system and shift the
Z-phase position by the amount
shown below. Then reinstall the
motor.
U Series: 1/2 revolution
H Series: 1/2 revolution
M Series: 1/4 revolution
Correct the wiring.
Correct the wiring.
Correctly set the position data.
Correctly set the software limits.
Correctly set the applicable
motor (UP-02).
Correct the wiring.
Correct the wiring.
Check and adjust the machin-
ery.
Chapter 4
Countermeasures
).
r).
Correctly set the position data.
Correct the wiring.
Use auto-tuning.
Adjust the gain manually.
4-27