Mitsubishi FR - S500 Pf1=, Pf2=, 158, Measuring Point Remarks Instrument Reference Measured Value

Item

Power supply voltage (V1)

Power supply side current

(I1)

Power supply side power

(P1)

Power supply side power factor (Pf1)

Output side voltage (V2)

Output side current (I2)

Output side power (P2)

Output side power factor

(Pf2)

Converter output

Frequency setting signal

Measuring Points and Instruments

Measuring Point	Measuring	Remarks
	Instrument	(Reference Measured Value)
		Is the commercial power supply
Across R-S, S-T	Moving-iron type	within permissible variation of AC
and T-R	AC voltmeter	voltage
		(Refer to page 161)
R, S and T line	Moving-iron type
currents	AC ammeter
At R, S and T, and	Electrodynamic	P1 = W11 + W12 + W13
across R-S, S-T	type single-phase
		(3-wattmeter method)
and T-R	wattmeter

Calculate after measuring power supply voltage, power supply side current and power supply side power.

[For three-phase power supply]					[For single-phase power supply]
P1						P1
Pf1= 3V1	I1	100%			Pf1= V1		I1	100%
				Rectifier type AC
Across U-V, V-W				voltmeter (Note 1)		Difference between phases is
				(Cannot be		within ± 1% of maximum output
and W-U
				measured by		voltage.
				moving-iron type)
				Moving-iron type		Current should be equal to or
U, V and W line						less than rated inverter current.
				AC ammeter
currents						Difference between phases is
				(Note 2)
						10% or lower.
At U, V and W, and				Electrodynamic		P2 = W21 + W22
across U-V and V-				type single-phase		2-wattmeter method (or 3-
W				wattmeter		wattmeter method)
Calculate in similar manner to power supply side power factor.
P2
Pf2= 3V2	I2		100%
Across P-N				Moving-coil type		Inverter LED display is lit.
				(such as a meter)		1.35 × V1
Across 2 (+)-5				Moving-coil type		0 to 5V/0 to 10VDC			is"5" common.
				(Meter, etc. may be
Across 4 (+)-5				used)		4 to 20mADC
				(Internal resistance:
				50kΩ or larger)

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