Mitsubishi FR-E500 Series Instruction Manual page 164

Item
Power supply
Across R-S (L
voltage
L ) and T-R (L
3
(V1)
Power supply side
R, S and T line currents
current
(L , L
1 2
(I1)
Power supply side At R (L
power and across R-S (L
(P1) (L -L
2 3
Calculate after measuring power supply voltage, power supply side current and power supply side
power.
Power supply side
power factor
Pf1 =
(Pf1)
Output side
voltage Across U-V, V-W and W-U
(V2)
Output side current
U, V and W line currents
(I2)
Output side power At U, V and W, and across U-
(P2) V and V-W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf2 =
(Pf2)
Across P-N (+ - −)
Converter output
Reset Across RES (positive)-SD
Output stop Across MRS (positive)-SD
Across A-C
Alarm signal
Across B-C
Note: 1. Use FFT to measure the output voltage accurately. It can not be measured accurately with a meter or
general instrumentation.
2. If the carrier frequency exceeds 5kHz, do not use this instrument since using it may increase eddy-
current loss produced in metal parts inside the instrument, leading to burnout.
In this case, use an approximate effective value type instrument.
Measuring Points and Instruments
Measuring Point Measuring Instrument
-L ), S-T (L - Moving-iron type AC
1 2 2
-L ) voltmeter
3 1
Moving-iron type AC
and L line currents) ammeter
3
), S (L ) and T (L ),
1 2 3
Electrodynamic type
-L ), S-T
1 2
single-phase wattmeter
) and T-R (L -L )
3 1
P1
100 %
3V1 I1
(Cannot be measured
Moving-iron type AC
ammeter
Electrodynamic type
single-phase wattmeter
P2
100 %
3V2 I2
Moving-coil type
(such as tester)
Moving-coil type
(Meter, etc. may be
used)
(Internal resistance:
50kΩ or larger)
Moving-coil type
(such as a meter)
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PROTECTIVE FUNCTIONS
Is the commercial power supply within
permissible variation of AC voltage
(Refer to page 149)
P1 = W11 + W12 + W13
(3-wattmeter method)
(Note 1)
Difference between phases is within
±1% of maximum output voltage.
by moving-iron type)
Current should be equal to or less than
rated inverter current.
Difference between phases is 10% or
(Note 2)
lower.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter
method)
Inverter LED display is lit. 1.35 × V1
Maximum 380V during regenerative
operation
20 to 30VDC when open.
ON voltage: 1V or less
Continuity check
Across A-C: DiscontinuityContinuity
Across B-C: Continuity
148
Remarks
(Reference Measured Value)
<Normal> <Fault>
Discontinuity
5