Mitsubishi FR - S500 instruction manual PU operation interlock, Mrs

(1) PU operation interlock

PU operation interlock forces the operation mode to be changed to the external operation mode when the MRS signal switches off. This function prevents the inverter from being inoperative by the external command if the mode is accidentally left unswitched from the PU operation mode.

1) Preparation

Set "7" in Pr. 79 (operation mode selection).

Set the terminal used for MRS signal input with any of Pr. 60 to Pr. 63 (input terminal function selection).

Refer to page 88 for Pr. 60 to Pr. 63 (input terminal function selection).

REMARKS

When terminal assignment is changed using Pr. 60 to Pr. 63, the other functions may be affected.

Check the functions of the corresponding terminals before making settings.

2) Function

MRS Signal	Function/Operation
	Output stopped during external operation.
ON	Operation mode can be switched to PU operation mode.
	Parameter values can be rewritten in PU operation mode.
	PU operation allowed.
	Forcibly switched to external operation mode.
OFF	External operation allowed.
	Switching to PU operation mode inhibited.

<Function/operation changed by switching on-off the MRS signal>

Operating Condition		MRS		Operation		Parameter	Switching to
Operation	Status			Mode	Operating Status		PU Operation
mode		Signal		(*2)		Write	Mode
	During	ON →	OFF		During stop	Allowed →	Disallowed
	stop	(*1)				disallowed
					If external operation
PU				PU →	frequency setting
	During	ON →	OFF	External	and start signal are	Allowed →
							Disallowed
	operation	(*1)			entered, operation is	disallowed
					performed in that
					status.
		OFF →	ON			Disallowed →	Allowed
	During					disallowed
					During stop
	stop	ON →	OFF			Disallowed →	Disallowed
						disallowed
External				External
		OFF →	ON		During operation →	Disallowed →	Disallowed
	During				output stop	disallowed
	operation	ON →	OFF		Output stop →	Disallowed →	Disallowed
					operation	disallowed

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