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APPENDICES
Appendix 6 Positioning control troubleshooting
Trouble type
Display reads "FFFF
parameter is read with GX
Configurator-QP.
Parameter
How can the parameters be
returned to their initial values ?
A parameter error occurred
although the parameter was set
correctly by GX Configurator-QP.
The machine overruns if operating
at high speeds when the hardware
stroke limit range is exceeded.
Hardware stroke limit
When the machine exceeded the
hardware stroke limit range,
positioning toward inside the range
was started, but the machine did
not start.
Exactly one rotation is required,
but the setting range for a "degree"
Degree
unit setting is "0 to 359.999...".
Won't the rotation deviate by
"0.00...1"?
If the "movement amount per
pulse" is calculated as written in
Movement amount
the manual, settings smaller than
per pulse
the basic parameter setting range
cannot be carried out.
Will an override setting value
written before starting be valid?
During path control, will the
override still be valid after the point
Override
is passed?
How can the override be
canceled?
Questions/Trouble
" when a
H
Appendix - 51
The PLC CPU power was turned OFF or the PLC CPU
was reset, etc., during flash ROM writing, which deleted
the data in the flash ROM.
Initialize the parameters, and reset the required
parameters.
(Refer to Section 13.2 "Parameter initialization function"
for details.)
Cd.2
Set the "
Parameter initialization request" to "1".
(Refer to Section 13.2 "Parameter initialization function"
for details.)
The parameter may have been overwritten in the PLC
program.
Review the PLC program.
In the QD75MH, deceleration stops are executed after the
machine exceeds hardware stroke limit range. Because of
this, more time is required for the deceleration stop as the
speed increases, and the overrun becomes larger.
(The deceleration time becomes shorter at lower speeds,
so the overrun becomes smaller.)
Use a "JOG operation", " Inching operation" or "Manual
pulse generator operation" to return the machine to inside
the hardware stroke limit range.
(When the hardware stroke limit range is exceeded,
positioning will not start toward inside the range even
when so commanded. Once the range is exceeded, a
return to inside the range can only be executed using a
"JOG operation", "Inching operation" or "Manual pulse
generator operation".)
Designate "360.000" in the INC control.
The motor will make exactly one rotation.
Set "movement amount per pulse" in the QD75MH using
the three parameter values of
Try setting the values following the explanations for each
parameter.
It will be valid.
It will still be valid.
Cd.13
Set the "
Positioning operation speed override" to
"100".
MELSEC-Q
Remedy
Pr.2
Pr.4
to
.
No.
1
2
3
4
5
6
7
8
9
10
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