Mitsumi electronic 55K Signals, Roles of the magnetic contactors MC1, MC2, MC3, Function On-Off

PARAMETERS

•Roles of the magnetic contactors (MC1, MC2, MC3)

Magnetic	Place of Installation	Role
Contactor
MC1	Between power supply and	Normally shorted with the following exception:
	inverter	Opened only when an inverter fault occurs (shorted again by resetting)
		Shorted for commercial power supply operation, opened for inverter
MC2	Between power supply and motor	operation
		Shorted when an inverter fault occurs (selected with parameter, except
		for external thermal relay operation)
		Shorted for inverter operation, opened for commercial power supply
MC3	Between inverter output and motor	operation
		Opened when an inverter fault occurs

<I/O signals>

1) When this function is used (Pr. 135 = "1"), the input signals are switched on-off as indicated below:

	Signal	Terminal Used	Function	On-Off		MC Operation ($: ON, ⋅ : OFF)
						MC1	MC2	MC3
				Commercial power supply-		$		
				inverter operation enable
	MRS	MRS	Operation	........................	ON
			enable/disable selection	Commercial power supply-		$	⋅	Unchanged
				inverter operation disable
				........................	OFF
			Inverter-commercial	Inverter operation		$	⋅	$
		Depending on			ON
	CS		power supply switch-	........................
		Pr. 180 to Pr.186		Commercial power supply		$	$	⋅
			over
				operation	OFF
			Inverter operation	Forward (reverse) rotation		$	⋅	$
	STF	STF	command (invalid for	........................	ON
	(STR)	(STR)	commercial power	Stop	OFF	$	⋅	$
			supply) (Note)
	OH	Depending on	External thermal relay	Motor normal ...	ON	$		
		Pr. 180 to Pr.186	input	Motor fault	OFF	⋅	⋅	⋅
			Operating condition	Initialization	ON	Unchanged	⋅	Unchanged
	RES	RES		Normal operation		$		
			initialization
					OFF
				........................
Note: • In the above MC Operation field, [-] indicates that MC1 is on, MC2 is off and MC3 is on in inverter
		operation and MC1 is on, MC2 is on and MC3 is off in commercial power supply operation.
		[Unchanged] indicates that the status before signal-on or -off is held.
	• The CS signal only functions when the MRS signal is on. STF (STR) only functions when MRS and								4
		CS are on.

•MC1 switches off when an inverter fault occurs.

•If the MRS signal is not switched on, neither commercial power supply nor inverter operation can be performed.

•For the RES signal, reset input acceptance selection can be made using reset selection (Pr. 75).

2)The output signals are output as follows:

Signal	Terminal Used	Description
MC1	Depending on Pr. 190	MC1's operation signal is output
MC2		MC2's operation signal is output
	to Pr. 195
MC3		MC3's operation signal is output

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