Mitsubishi Electronics FR-S500 instruction manual PU operation interlock, Preparation, Function

Operation selection function parameters

(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" (PU operation interlock) in Pr. 79.

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

Refer to page 98 for Pr. 60 to Pr. 63 (input terminal function selection).

CAUTION

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

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