Yaskawa MP920 User's Manual Design - Manual (Page 552)

A.4 Monitoring Parameter Alarms
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A.4.2 Monitoring Parameter Number 23 Alarms
The following table shows the servo-related alarms for each axis.
Register
Number
Bit Alarm Name Cause Action
IL††22 b0: Not used − −
b1: OTF Forward Overtravel • Forward overtravel of the SERVO-
PACK was detected (P-OT signal
ON).
• Check the overtravel limit switch,
and bring it back in the opposite
direction after resetting the alarm.
• Check the overtravel input signal.
• Check the parameters relating to
overtravel alarm detection.
b2: OTR Reverse Overtravel • Reverse overtravel of the SERVO-
PACK was detected (N-OT signal
ON).
• Check the overtravel limit switch,
and bring it back in the opposite
direction after resetting the alarm.
• Check the overtravel input signal.
• Check the parameters relating to
overtravel alarm detection.
b3: SOTF Positive Software
Limit • Movement towards the positive
software limit area was detected.
• After checking the program and
operation, reset the alarm and
bring the switch back in the oppo-
site direction.
• Check the parameters relating to
the software limit.
b4: SOTR Negative Software
Limit • Movement towards the negative
software limit area was detected.
• After checking the program and
operation, reset the alarm and
bring the switch back in the oppo-
site direction.
• Check the parameters relating to
the software limit.
b5: Not used − −
b6:
TIMEOVER Positioning time
exceeded • After the command was executed,
positioning could not be com-
pleted in the time set in
OW††34 (Positioning Com-
pleted Check Time).
• Check the parameters relating to
the servo characteristics (each
gain setting).
• Check the connections between
the SERVOPACK and motors.
b7: Not used − −
b8: Not used − −
b9: Not used − −
b10: Not used − −
b11:
SET_NRDY No Zero Point • No zero point has been set. • Set the zero point.
b12 to b16: Not used − −
b18:
PGLEFT Broken PG Wiring • Encoder wiring is faulty or broken.
• Encoder or SERVOPACK is
faulty.
• SVA Module is faulty.
• Check the encoder wiring.
• Contact your Yaskawa sales repre-
sentative.
b19: Not used − −