Mitsubishi FR-A846-00023, Инструкция по эксплуатации

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Measurement of main circuit voltages, currents, and powers
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
117
5
 Measuring points and instruments

Use an FFT to measure the output voltage accurately. A tester or general measuring instrument cannot measure accurately.

When the carrier frequency exceeds 5 kHz, 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 an approximate-effective value type.

When the setting of Pr.195 ABC1 terminal function selection is the positive logic

A digital power meter (designed for inverter) can also be used to measure.
Item Measuring point Measuring instrument Remarks (reference measured value)
Power supply voltage
V1
Across R/L1 and S/L2,
S/L2 and T/L3,
T/L3 and R/L1
Moving-iron type AC voltmeter

Commercial power supply
Within permissible AC voltage fluctuation
(Refer to
page 122 .)
Power supply side
current
I1
R/L1, S/L2, T/L3 line
current
Moving-iron type AC ammeter

Power supply side
power
P1
R/L1, S/L2, T/L3 and
Across R/L1 and S/L2,
S/L2 and T/L3,
T/L3 and R/L1
Digital power meter (for inverter) or
electrodynamic type single-phase
wattmeter
P1 = W11 + W12 + W13 (3-wattmeter method)
Power supply side
power factor
Pf1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Output side voltage
V2 Across U and V, V and
W, and W and U
Rectifier type AC voltage meter

(moving-iron type cannot
measure.)
Difference between the phases is within 1% of the
maximum output voltage.
Output side current
I2 U, V and W line
currents
Moving-iron type AC ammeter

Difference between the phases is 10% or lower of
the inverter rated current.
Output side power
P2
U, V, W and
across U and V, V and
W Digital power meter (for inverter) or
electrodynamic type single-phase
wattmeter
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Output side power
factor
Pf2
Calculate in similar manner to power supply side power factor.
Converter output Across P/+ and N/-
Moving-coil type
(such as tester)
Inverter LED is lit. 1.35

V1
Frequency setting
signal
Across 2, 4(+) and 5
Moving-coil type
(tester and such may be used.)
(internal resistance 50 k
Ω or more)
0 to 10 VDC, 4 to 20 mA
"5" is .
common
Across 1(+) and 5
0 to ±5 VDC and 0 to ±10 VDC
Frequency setting
power supply
Across 10(+) and 5 5.2 VDC
Across 10E(+) and 5 10 VDC
Frequency meter
signal
Across AM(+) and 5
Approximately 10 VDC at maximum
frequency
(without frequency meter)
Across CA(+) and 5
Approximately 20 mADC at maximum
frequency
Across FM(+) and SD
Approximately 5 VDC at maximum
frequency
(without frequency meter)
Pulse width T1: Adjust with C0 (Pr.900) .
Pulse cycle T2: Set with Pr.55 .
(frequency monitor only)
"SD" is
common
Start signal
Select signal
Reset signal
Output stop signal
Across STF, STR, RH,
RM, RL, JOG, RT, AU,
STOP, CS, RES,
MRS(+) and SD (for
sink logic)
When open
20 to 30 VDC
ON voltage: 1 V or less
Fault signal
Across A1 and C1
Across B1 and C1 Moving-coil type
(such as tester)
Continuity check

[Normal] [Fault]
Across A1 and C1 Discontinuity Continuity
Across B1 and C1 Continuity Discontinuity
Pf
1
P
1
3V
1
I

1
------------------------ 100 
=
%
Pf
2
P
2
3V
2
I
2

------------------------ 100

=
%
8 VDC
T1
T2