Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 668 / 727

Measurement of main circuit voltages, currents and powers
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
667
7
 Measuring points and instruments

Use an FFT to measure the output voltage accurately. A tester or general measuring instrument cannot measure accurately.

When the setting of Pr.195 ABC1 terminal function selection is the positive logic
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
Digital power meter (for inverter)
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to
page 672 .)
Power supply side
current
I1
R/L1, S/L2, T/L3 line
current
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
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
Digital power meter (for inverter)

Difference between the phases is within 1% of the
maximum output voltage.
Output side current
I2 U, V and W line
currents 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)
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/- Tester such as a digital multimeter Inverter LED is lit. 1.35

V1
Frequency setting
signal
Across 2, 4(+) and 5
Tester such as a digital
multimeter, or moving-coil type
instrument
(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
Start signal
Select signal
Reset signal
Output stop signal
Across AM(+) and 5
Approximately 10 VDC at maximum
frequency
(without frequency meter)
Across FM(+) and
SD
Approximately 5 VDC at maximum
frequency
(without frequency meter)
Pulse width T1: Adjust with Pr.900 .
Pulse cycle T2: Set with Pr.55 .
(frequency monitor only)
"SD" is
common
Across STF, STR,
RH, RM, RL, JOG,
RT, AU, STP (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
Tester such as a digital multimeter
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

=
%
8VDC
T1
T2