Measurement Of Powers - Mitsubishi Electric 800 Series Instruction Manual

 Measuring points and instruments
Item Measuring point
Between R/L1 and S/L2,
Input voltage
S/L2 and T/L3, and T/L3
V1
and R/L1
Input current Line current at R/L1, S/L2,
I1 and T/L3
At R/L1, S/L2, and T/L3,
Input power and between R/L1 and S/
P1 L2, S/L2 and T/L3, and T/
L3 and R/L1
Calculate after measuring input voltage, input current and input power.
Input power factor
Pf1
Output voltage Between U and V, V and
V2 W, and W and U
Output current
Line current at U, V, and W
I2
At U, V, and W, and
Output power
between U and V, and V
P2
and W
Calculate in similar manner to the input power factor.
Output power factor
Pf2
Converter output Between P/+ and N/-
Frequency setting
2, and between 4(+) and 5
signal
Power supply for a
frequency setting Between 10(+) and 5
potentiometer
Between AM(+) and 5
Frequency meter signal
Between FM(+) and SD
Start signal, At STF/DI0, STR/DI1, RH,
selection signal,
RM, RL, RES, and
reset signal, between MRS(+) and SD
output stop signal (for sink logic)
Between A and C
Fault signal
Between B and C
*1 Use an FFT to measure the output voltage accurately. A digital multimeter or general measuring instrument cannot measure accurately.
*2 When the setting of Pr.192 ABC terminal function selection is the positive logic.
3.2.1

Measurement of powers

Use digital power meters (for inverter) both on the inverter's input and output sides.
Measuring instrument
Digital power meter (designed for
inverter)
Digital power meter (designed for
*1
inverter)
Digital power meter (designed for
inverter)
Digital multimeter or other tester Inverter LED indication 1.35 × V1
Digital multimeter or other tester,
or moving-coil type instrument
(internal resistance 50 kΩ or
more)
Digital multimeter or other tester
3.2 Measurement of main circuit voltages, currents, and powers
Remarks (reference measured value)
Commercial power
Within permissible AC voltage fluctuation. (Refer to
the FR-E800 Instruction Manual (Connection) or
FR-E860 Instruction Manual (Connection).)
P1 = W11 + W12 + W13 (3-wattmeter method)
Difference between the phases must be within 1%
of the maximum output voltage.
Difference between the phases must be within
10%.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
0 to 10 VDC, 4 to 20 mA
5.2 VDC
Approximately 10 VDC at maximum
frequency
(without frequency meter)
Approximately 5 VDC at maximum
frequency
(without frequency meter)
T1
8VDC
T2
Pulse width T1: Adjust with C0
(Pr.900).
Pulse cycle T2 Set with Pr.55
(for frequency monitor only).
Voltage when terminal is open: 20 to
30 VDC.
Voltage when signal is ON: 1 V or
less.
*2
Continuity check
Normal: discontinuity across A and C, continuity
across B and C
Fault: continuity across A and C, discontinuity
across B and C
3. Precautions for Maintenance and Inspection
1
2
3
4
5
6
7
8
Terminal 5 is
9
a common
terminal.
10
Terminal SD
is a common
terminal.
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