Mitsubishi Electronics FR-V500 Measuring Points and Instruments, 100% Pf1 =, Pf2 =

Precautions for maintenance and inspection

Measuring Points and Instruments

Item	Measuring		Measuring Instrument	Remarks (Reference Measurement Value)
	Point
Power supply	Across R-S, S-T			Within permissible commercial power supply AC
voltage			Moving-iron type AC voltmeter
	and T-R			voltage fluctuation (Refer to page 98)
V1
Power supply side	R, S and T line
current			Moving-iron type AC ammeter
	currents
I1
Power supply side	At R, S and T,		Electrodynamic type single-
power	and across R-S,			P1=W11+W12+W13 (3-wattmeter method)
			phase wattmeter
P1	S-T and T-R
Power supply side	Calculate after measuring power supply voltage, power supply side current and power supply side
	power.
power factor
	P1
Pf1			100%
	Pf1 = 3V1	I1
Output side voltage	Across U-V, V-		Rectifier type AC voltmeter	Difference between the phases is within ±1% of
			(Caution 1)
V2	W and W-U			the maximum output voltage.
			(M oving-iron type cannot m easure)
Output side current	U, V and W line		Moving-iron type AC ammeter	Difference between the phases is 10% or lower of
I2	currents		(Caution 2)	the rated inverter current.
Output side power	At U, V and W,		Electrodynamic type single-	P2=W21+W22
	and across U-V
P2			phase wattmeter	2-wattmeter method (or 3-wattmeter method)
	and V-W
Output side power	Calculate in similar manner to power supply side power factor.
factor	P2		100%
Pf2	Pf2 = 3V2	I2
Converter output	Across P-N		Moving-coil type	Inverter LED display is lit. 1.35×V1
			(such as tester)
Speed setting signal	Across 2(+)-5			0 to 10VDC
(Torque setting	Across 1(+)-5			0 to ±10VDC
signal)
	Across 3(+)-5			0 to ±10VDC
Frequency setting	Across 10E(+)-5			10VDC		"5" is
power supply			Moving-coil type
						common.
			(Tester and such may be used)
	Across DA1(+)-5			±10VDC at maximum speed
Speed meter signal			(Internal resistance: 50kΩ or	(without speed meter)
			larger)
	Across DA2(+)-5			Approx. 10VDC at maximum speed
				(without speed meter)
Start signal	Across STF,			When open		"SD" is
	STR, DI1, DI2,			20 to 30VDC
Select signal						common.
	DI3, DI4(+)-SD			ON voltage: 1V or less
				Continuity check
Alarm signal	Across A-C		Moving-coil type	<Normal>	<Abnormal>
	Across B-C		(such as tester)	Across A-C: Discontinuity	Continuity
				Across B-C: Continuity	Discontinuity

CAUTION

1.Use an FFT to measure the output voltage accurately. A tester or general measuring instrument cannot measure accurately.

2.When the carrier frequency exceeds 5kHz, do not use this instrument since using it may increase eddy- current losses produced in metal parts inside the instrument, leading to burnout. In this case, use the approximately effective value type instrument.

ERRORS AND PROTECTIVE FUNCTIONS

6

98