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Measurement Of Powers; Measurement Of Voltages - Mitsubishi Electric 800 Series Hardware Instruction Manual

Separated converter type.
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Item
Output voltage
V2
Output current
I2
Output power
P2
Output power factor
Pf2
Frequency setting signal
Power supply for a
frequency setting
potentiometer
Frequency meter signal
Start signal,
Select signal,
Reset signal,
Output stop signal
Fault signal
*1
Use an FFT to measure the output voltage accurately. A digital multimeter or general measuring instrument cannot measure accurately.
*2
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.
*3
When the setting of Pr.195 ABC1 terminal function selection is the positive logic.
5.2.1

Measurement of powers

Use a digital power meter (for inverter) for the input side of the converter unit (FR-CC2) and the output side of the inverter.
5.2.2

Measurement of voltages

 Converter unit (FR-CC2) input side
Use digital power meters (for inverters) for the input side voltage.
 Inverter output side
When using a measuring instrument, use a digital power meter for inverters as the inverter outputs PWM-controlled square
wave voltage.
Measuring point
Measuring instrument
Between U and V, V and
W, and W and U
Digital power meter
Line current at U, V, and
(designed for inverter)
W
At U, V, and W, and
Digital power meter
between U and V, and V
(designed for inverter)
and W
Calculate in similar manner to the input power factor.
2, and between 4(+) and 5
Between 1(+) and 5
Between 10(+) and 5
Between 10E(+) and 5
Between AM(+) and 5
Between CA(+) and 5
Digital multimeter or other
tester, or moving-coil type
instrument (internal
resistance 50 kΩ or more)
Between FM(+) and SD
Across STF, STR, RH,
RM, RL, JOG, RT, AU,
STOP, CS, RES, MRS(+)
and SD (for sink logic)
Between A1 and C1
Digital multimeter or other
Between B1 and C1
tester
Remarks (reference measured value)
Difference between the phases must be within 1%
of the maximum output voltage.
*1
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
0 to ±5 VDC and 0 to ±10 VDC
5.2 VDC
10 VDC
Approximately 10 VDC at
maximum frequency
(without frequency meter)
Approximately 20 mADC at
maximum frequency
Approximately 5 VDC at maximum
frequency (without frequency
meter)
T1
8VDC
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.
Continuity check
[Normal]
Across A1 and C1: Discontinuity
Across B1 and C1: Continuity
[Fault]
Across A1 and C1: Continuity
Across B1 and C1: Discontinuity
5. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
5.2 Measurement of main circuit voltages, currents, and powers
Terminal 5 is
a common
terminal.
Terminal SD
is a common
terminal.
*3
1
2
3
4
5
6
7
8
9
10
113

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