Excessive Position Error: F1; Software Over Travel Limit: F2; Hardware Over Travel Limit: F3; Emergency Stop: F4 - NSK MEGATORQUE M-ESB-YSB2020AB300 User Manual

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u Excessive Position Error: F1
(1) The Motor did not move normally because
of a mechanical interference such as a
brake, and thus position error of error
counter exceeds the CO setting.
(2) Error in position error counter exceeds the
CO setting due to poor servo gain tuning.
(3) Position error in error counter exceeds the
CO setting because of high
acceleration/deceleration (MA).
(4) Position error in error counter exceeds due
to low setting of the CO data..
(5) Unmatched combination of the Motor and
the Driver Unit.
(6) Improper PA setting.
(7) Defective PCB.
(If the alarm occurs even though the RUN
command is not executed.)
u Software Over Travel Limit: F2
(1) The Motor enters the off-limits zone
set by the OTP and the OTM
parameters.
l The off-limits zone shall be set so that the Motor can stop with this alarm at where it won't be
mechanically locked or interfered.
u Hardware Over Travel Limit: F3
(1) Motor activated the limit switch.
(2) Mistaken setting of the input port polarity.
(3) Defective travel limit switch or faulty
wiring.
u Emergency Stop: F4
(1) Mistaken setting of input port polarity.
(2) The EMST is input. (In case of normally
open contact.)
(3) The EMST (CN2) is OFF. (In case of
normally closed contact.)
(4) Faulty wiring.
Cause
Cause
Cause
Cause
— 10-13 —
10.3. Cause and Remedy of Alarm
Remedy
· Remove mechanical interference.
· Readjust gain.
(Refer to "5. Tuning and Trial Running.")
· Decrease acceleration/deceleration (MA).
· Increase the CO setting.
· Activate the CLR input to cancel alarm. At this
moment the position error counter will be cleared to
0 (Zero).
· Adjust servo parameters (VG, VI, and PG).
· Adjust acceleration/deceleration (MA).
· Reset the CO setting.
· Check the applied load.
· Check reference number of the Motor and the
Driver Unit.
· Execute the OG command (automatic position
adjustment of position sensor).
· Replace the Driver Unit referring to "Appendix 4:
How to Replace ESB Driver Unit."
Remedy
· Back the Motor out of the software over travel limit.
· Move the Motor out the off-limits zone.
Remedy
· Move the Motor out of the off-limit zone.
· Confirm the AB parameter.
· Check for defective travel limit switch and faulty
wiring.
Remedy
· Confirm the parameter "AB."
· Input the EMST OFF after the Motor stops.
· Input the EMST ON after the Motor stops.
· Check wiring.