# Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual Page 784

Fr-a800 series.

 Measuring points and instruments
Item
Measuring point
Between R/L1 and S/L2,
Power supply voltage
S/L2 and T/L3, or
V1
T/L3 and R/L1
Input current
R/L1, S/L2, T/L3 line
I1
current
R/L1, S/L2, T/L3, and
Input power
between R/L1 and S/L2,
P1
S/L2 and T/L3, or
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, or W and U
Output current
U, V and W line currents
I2
U, V, or W, and
Output power
between U and V, or V and
P2
W
Calculate in similar manner to the input power factor.
Output power factor
Pf2
Converter output
Between P/+ and N/-
2, and between 4(+) and 5
Frequency setting
signal
Between 1(+) and 5
Power supply for a
Between 10(+) and 5
frequency setting
Between 10E(+) and 5
potentiometer
Between AM(+) and 5
Between CA(+) and 5
Frequency meter signal
Between FM(+) and SD
STF, STR, RH, RM, RL,
Start signal
JOG, RT, AU, STP
Select signal
(STOP), CS, RES,
Reset signal
between MRS(+) and SD
Output stop signal
(for sink logic)
Between A1 and C1
Fault signal
Between B1 and C1
*1
Use an FFT to measure the output voltage accurately. A tester 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
Measuring instrument
*4
Moving-iron type AC voltmeter
*4
Moving-iron type AC ammeter
Digital power meter (designed for
inverter) or electrodynamic type
single-phase wattmeter
*1*4
Rectifier type AC voltmeter
(moving-iron type cannot
measure.)
Moving-iron type AC
*2*4
ammeter
Digital power meter (designed for
inverter) or electrodynamic type
single-phase wattmeter
Moving-coil type
(such as tester)
Moving-coil type
(such as tester)
(internal resistance 50 kΩ or
more)
Moving-coil type
(such as tester)
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.2 Measurement of main circuit voltages, currents, and powers
Remarks (reference measured value)
Commercial power supply
Within permissible AC voltage fluctuation (Refer to
page
790.)
P1 = W11 + W12 + W13 (3-wattmeter method)
Difference between the phases is within 1% of the
maximum output voltage.
Difference between the phases is 10% or lower of
the rated inverter current.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Inverter LED indication 1.35 × V1
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)
maximum frequency
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).
When open
20 to 30 VDC
ON voltage: 1 V or less
*3
Continuity check
[Normal]
A1-C1
No
B1-C1
Yes
1
2
3
4
5
6
7
8
9
Terminal 5 is
a common
terminal.
10
Terminal SD
is a common
terminal.
[Fault]
Yes
No
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