Mitsubishi Electric 800 Series Instruction Manual page 668

Measuring points and instruments
Item Measuring point
Across R/L1 and S/L2,
Power supply voltage
S/L2 and T/L3,
V
1
T/L3 and R/L1
Power supply side
R/L1, S/L2, T/L3 line
current
current
I
1
R/L1, S/L2, T/L3 and
Power supply side
Across R/L1 and S/L2,
power
S/L2 and T/L3,
P
1
T/L3 and R/L1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Power supply side
power factor
Pf
1
Pf 1
Output side voltage Across U and V, V
V and W, and W and U
2
Output side current U, V and W line
I currents
2
U, V, W and
Output side power
across U and V, V
P
2
and W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf
2
Pf 2
Converter output Across P/+ and N/-
Across 2, 4(+) and 5
Frequency setting
signal
Across 1(+) and 5
Across 10(+) and 5
Frequency setting
power supply
Across 10E(+) and 5
Across AM(+) and 5
Frequency meter
Across FM(+) and
signal
SD
Start signal
Select signal
Reset signal
Output stop signal
Across STF, STR,
RH, RM, RL, JOG,
RT, AU, STP (STOP),
CS, RES, MRS(+)
and SD (for sink
logic)
Across A1 and C1
Fault signal
Across B1 and C1

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
Measurement of main circuit voltages, currents and powers
Measuring instrument
Digital power meter (for inverter)
P
1
----------------------- - 
= 100 %

3V I
1 1
Digital power meter (for inverter)
Digital power meter (for inverter)
P
2

= ----------------------- - 100 %

3V I
2 2
Tester such as a digital multimeter
Tester such as a digital
multimeter, or moving-coil type
instrument
(internal resistance 50 kΩ or more)
Tester such as a digital multimeter
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Remarks (reference measured value)
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to page 672.)
P = W + W + W (3-wattmeter method)
1 11 12 13
Difference between the phases is within 1% of the
maximum output voltage.

Difference between the phases is 10% or lower of the
inverter rated current.
P = W + W
2 21 22
2-wattmeter method (or 3-wattmeter method)
Inverter LED is lit. 1.35  V
1
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 5 VDC at maximum
frequency
(without frequency meter)
T1
8VDC
T2
Pulse width T1: Adjust with Pr.900.
Pulse cycle T2: Set with Pr.55.
(frequency monitor only)
When open
20 to 30 VDC
ON voltage: 1 V or less
Continuity check

[Normal]
Across A1 and C1 Discontinuity
Across B1 and C1 Continuity
"5" is
common
"SD" is
common
[Fault]
Continuity
Discontinuity
7
667