Mitsubishi Electric FR-A800, Instruction Manual

Page: 947 / 1042

Precautions for maintenance and inspection Measurement of main circuit voltages, currents and powers
FR-A800 7 - 13
Measuring points and instruments
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
Moving-iron type AC voltmeter
#
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to page 8-1.)
Power supply side
current
I1
R/L1, S/L2, T/L3 line
current
Moving-iron type AC ammeter
#
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
Digital power meter (for
inverter) or electrodynamic type
single-phase wattmeter
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
Rectifier type AC voltage meter
#
(moving-iron type cannot
measure.)
Difference between the phases is within 1% of
the maximum output voltage.
Output side
current
I2
U, V and W line
currents
Moving-iron type AC ammeter
#
Difference between the phases is 10% or lower
of the rated inverter current.
Output side power
P2
U, V, W and
across U and V, V
and W Digital power meter (for
inverter) or electrodynamic type
single-phase wattmeter
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/– Moving-coil type
(such as tester)
Inverter LED is lit. 1.35 × V1
Frequency setting
signal
Across 2, 4(+) and 5
Moving-coil type
(tester and such may be used.)
(internal resistance 50 kΩ or
more)
0 to 10 V DC, 4 to 20 mA
"5" is
.common
Across 1(+) and 5 0 to ±5 V DC and 0 to ±10 V DC
Frequency setting
power supply
Across 10(+) and 5 5.2 V DC
Across 10E(+) and
5
10 V DC
Frequency meter
signal
Across AM(+) and 5
Approximately 10 V DC at
maximum frequency
(without frequency meter)
Across CA(+) and 5
Approximately 20 mADC at
maximum frequency
Across FM(+) and
SD
Approximately 5 V DC at
maximum frequency
(without frequency meter)
Pulse width T1:
Adjust with C0 (Pr. 900).
Pulse cycle T2: Set with Pr. 55.
(frequency monitor only)
"SD" is
common
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)
When open
20 to 30 V DC
ON voltage: 1 V or less
Tab. 7-5: Measuring Points and Instruments (1)
Pf
1
P
1
3V
1
I
×
1
------------------------- 100
×
=
%
Pf
2
P
2
3V
2
I
2
×
------------------------- 100
×
= %
T1
T2
8 V DC