Mitsubishi Electric QD75P1N User Manual page 865

APPENDICES
Trouble type
An error "Backlash compensation
amount error" (error code: 920)
occurs even when the backlash
compensation value is set to "1".
When a JOG operation is
attempted, errors such as
"Hardware stroke limit (+)" or
"Hardware stroke limit (–)" (error
code: 104 or 105) occur and the
machine does not move.
An error "Speed designation
during OP shift error" (error code:
Error/warning 997) appears when the PLC
READY signal [Y0] turns from OFF
to ON.
When the start signal was turned
ON immediately after the stop
signal ON, a warning "Start during
operation" (warning code: 100)
was detected, and the start was
ignored.
Does a warning "Deceleration/stop
speed change" (warning code:
500) occur only during "stop
deceleration" and "automatically
deceleration"?
Is there any problem if the
operation is continued in that state
without resetting the error?
Position control was executed but
Positioning complete
the positioning complete signal
signal
does not turn ON.
Questions/Trouble
Appendix - 149
Remedy
Backlash compensation value
0 
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.2 Movement
amount per rotation" to 1/10 (or 1/100, or 1/1000).
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.
A value besides "0" or "1" may be set in the
" Pr.56 Speed designation during OP shift".
Review the set sequence program, and reset the correct
parameters.
The QD75 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 a warning
"Start during operation" (warning code: 100) will occur.
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.)
Depending on the stop occurrence factor, positioning may
have not been completed normally.
Check the axis monitor " Md.26 Axis operation status"
after the BUSY signal has turned OFF.
Stop : The stop signal has turned ON during positioning.
Check the condition under which the stop signal (Y
stop, external stop) turns ON.
Error : An error has occurred during positioning.
Check the error occurrence factor from
" Md.23 Axis error No.".
The setting value of the detailed parameter 2 "Positioning
complete signal output time" is 0 or shorter than the scan
time.
Using the sequence program, set the time when the signal
can be detected securely.
MELSEC-Q
No.
 255
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