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Appendix - 56
MELSEC-Q
APPENDICES
Trouble type Questions/Trouble Remedy No.
Backlash compensation value
0
≤
Movement amount per pulse
≤
65535
Error 920 (backlash compensation
amount error) occurs even when
the backlash compensation value
is set to "1".
Setting is not possible if the above equation is not
satisfied.
45
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.
46
Error 997 (Speed selection at OP
shift error) appears when the PLC
READY signal [Y0] turns from OFF
to ON.
A value besides "0" or "1" may be set in the
Pr.56
Speed
designation during OP shift.
Review the set PLC program, and reset the correct
parameters.
47
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 QD75MH 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.
48
Error/warning
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.)
49
The positioning may have not been completed properly
by the occurrence of the stop factor.
Check the axis monitor "
Md.26
axis operation state"
after BUSY signal OFF.
Stopped : The stop signal is turned ON
during positioning.
Check the condition of the stop
signal (Y stop or external stop)
ON.
During error occurrence : An error occurred during
positioning.
Check the cause of error
occurrence from "
Md.23
axis
error number".
50
Positioning
completion signal
When the position control is
carried out, the positioning
completion signal is not turned ON.
The setting value for detailed parameter 2 "Positioning
completion signal output time" is 0 or shorter than scan
time.
Set the properly detectable time using the PLC program.
51