Mitsubishi Electronics QD75P, QD75D user manual Appendix 11 Positioning control troubleshooting

APPENDICES

Appendix 11 Positioning control troubleshooting

MELSEC-Q

Trouble type	Questions/Trouble				Remedy					No.
		The PLC CPU power was turned OFF or the PLC CPU
		was reset, etc., during flash ROM writing, which deleted
	Display reads "FFFFH" when a	the data in the flash ROM.
	parameter is read with GX	Initialize the parameters, and reset the required								1
	Configurator-QP.	parameters.
		(Refer to Section 13.2 "Parameter initialization function"
Parameter		for details.)
		Set the "		Parameter initialization request" to "1".
	How can the parameters be		Cd.2
	returned to their initial values	(Refer to Section 13.2 "Parameter initialization function"								2
	(default values)?
		for details.)
	A parameter error occurred	The parameter may have been overwritten in the
	although the parameter was set	sequence program.								3
	correctly by GX Configurator-QP.	Review the sequence program.
		In the QD75, deceleration stops are executed after the
	The machine overruns if operating	machine exceeds hardware stroke limit range. Because of
	at high speeds when the hardware	this, more time is required for the deceleration stop as the								4
	stroke limit range is exceeded.	speed increases, and the overrun becomes larger.
		(The deceleration time becomes shorter at lower speeds,
		so the overrun becomes smaller.)
Hardware stroke limit		Use a "JOG operation", " Inching operation" or "Manual
		pulse generator operation" to return the machine to inside
	When the machine exceeded the	the hardware stroke limit range.
	hardware stroke limit range,	(When the hardware stroke limit range is exceeded,
	positioning toward inside the range	positioning will not start toward inside the range even								5
	was started, but the machine did	when so commanded. Once the range is exceeded, a
	not start.	return to inside the range can only be executed using a
		"JOG operation", "Inching operation" or "Manual pulse
		generator operation".)
	Exactly one rotation is required,
Degree	but the setting range for a "degree"	Designate "360.000" in the INC control.								6
	unit setting is "0 to 359.999...".	The motor will make exactly one rotation.
	Won't the rotation deviate by
	"0.00...1"?
	If the "movement amount per	Set "movement amount per pulse" in the QD75 using the
	pulse" is calculated as written in
Movement amount		three parameter values of				Pr.2	to	Pr.4	.
	the manual, settings smaller than									7
per pulse		Try setting the values following the explanations for each
	the basic parameter setting range
	cannot be carried out.	parameter.
	Will an override setting value	It will be valid.								8
	written before starting be valid?
	During path control, will the
Override	override still be valid after the point	It will still be valid.								9
	is passed?
		Set the "			Positioning operation speed override" to
	How can the override be		Cd.13							10
	canceled?	"100".

Appendix - 92