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Appendix - 54
MELSEC-
A
APPENDICES
Trouble type Questions/Trouble Remedy No.
Error/warning
Error 997 (speed selection at zero
point shift error) occurred. What
does "OPR" mean?
"OPR" stands for "Original Position Return", or in other
words, a zero point return.
53
Error 938 (backlash compensation
amount error 2) occurs even when
the backlash compensation value
is set to "1".
0
Backlash compensation value
255
54
Movement amount per pulse
Setting is not possible if the above equation is not
satisfied.
Adjust by setting "
Pr.4 Unit magnification" to 10-fold
(or 100-fold, or 1000-fold), and setting "
Pr.3
Movement amount per rotation" to 1/10 (or 1/100, or
1/1000).
When a JOG operation is
attempted, errors such as error 104
(hardware stroke limit+) or error 105
(hardware stroke limit –) occur and
the machine does not move.
The hardware stroke limit wiring has probably not been
carried out.
Refer to section "12.4.4 Hardware stroke limit function" for
details, and wire accordingly.
55
Error 971 (tracking control mode
error) occurs. What could be
causing the error?
A value besides "0" or "1" may be set in the "
Pr.44
Near pass mode selection for path control".
Review the set sequence program, and reset the correct
parameters.
56
Error 997 (speed selection at zero
point shift error) appears when the
remote station READY signal
[RX(n+7)B] turns from OFF to ON.
A value besides "0" or "1" may be set in the "
Pr.57
Speed designation during zero point shift".
Review the set sequence program, and reset the correct
parameters.
57
When the start signal was turned
ON immediately after the stop
signal ON, warning 100 (start
during operation) was detected,
and the start was ignored.
The D75P2 starts the deceleration stop process when the
stop signal ON is detected. Thus, the machine interprets
that "positioning is still being executed" immediately after
the stop signal ON. Even if the start signal is turned ON at
that time, the start request will be ignored and warning
100 will occur.
58
Does warning 500 (deceleration
and stop speed change) occur
only during "stop deceleration" and
"automatically deceleration"?
Is there any problem if the
operation is continued in that state
without resetting the error?
The warning occurs only at those times mentioned at the
left. Because this is a warning, there is no problem if the
operation can be continued without resetting the error.
(When the speed is changed using the override, the new
value will not be reflected on the data being executed, but
will be reflected from the next start.)
59
Positioning complete
signal
Position control was performed but
positioning complete signal does
not turn ON.
Positioning may not have been completed normally due to
occurrence of a stop cause.
Check the axis monitor "Axis operation status (RWrn+7,
RWrn+15)" after the BUSY signal has turned OFF.
During stop: The stop signal has turned ON during
positioning. Check the condition under which
the stop signal (Y stop, external stop) turns
ON.
During error occurrence:
An error occurred during positioning. Confirm
the error occurrence cause from "Axis error
No. (RWrn+5, RWrn+13).
60
The setting of detailed parameter 2 "Positioning
completion signal output time" is 0 or shorter than the
scan time.
Set the time that can be detected securely in the
sequence program.
61