Mitsubishi Electric FATEC FR-A800 Manual page 55

4
PREVENTIVE MAINTENANCE
Item
Power supply voltage
V
1
Power supply side current
I
1
Power supply side power
P
1
Power supply side power
factor
Pf
1
Output side voltage
V
2
Output side current
I
2
Output side power
P
2
Output side power factor
Pf
2
Converter output
Frequency setting signal
Frequency setting power
supply
Frequency meter signal
Start signal
Select signal
Reset signal
Output stop signal
4.2 Maintenance and inspection
50
Measuring points and instruments
Measuring point
Across R and S, S and T, T
and R
R, S, and T line currents
R, S, T and R and S, S and
T, T and R
type single-phase wattmeter
Calculate after measuring power supply voltage, power supply side current and power supply side power.
P
1
Pf × 100%
＝
1
√ V I
3 ·
1 1
Across U and V, V and W,
W and U
U, V, and W line currents
U, V, W and U and V, V
and W
Calculate in similar manner to power supply side power factor.
P
2
Pf × 100 %
=
2
V
√
3 · I
2 2
Across P and N
Across 2(+) and -5
Across 1(+) and -5
Across 4(+) and -5
Across 10(+) and -5
Across 10E(+) and -5
Across AM(+) and 5
Across FM(+) and SD (internal resistance 50 kΩ or
Across SD and the
following: STF, STR, RH,
RM, RL, JOG, RT, AU,
STOP, CS (+)
Across RES (+) and SD
Across MRS (+) and SD
Measuring instrument
Moving-iron type AC
voltmeter 
Moving-iron type AC
ammeter 
Digital power meter (for
inverter) or electrodynamic
Rectifier type AC voltmeter
()
(moving-iron type cannot
measure.)
Moving-iron type AC
ammeter ()
Digital power meter
(for inverter) or
electrodynamic type
single-phase wattmeter
Moving-coil type
(such as tester)
Moving-coil type
(tester and such may be
used.)
more)
Remarks (reference measured value)
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to the Instruction Manual of the inverter.)
P =W +W +W
1 11 12 13
3-wattmeter method
Difference between the phases is within ±1% of
the maximum output voltage.
Inverter rated current or lower
Difference between the phases is 10% or lower
P =W +W
2 21 22
2-wattmeter method (or 3-wattmeter method)
1.35 × V
Inverter LED indication ON
0 to 5 VDC / 0 to 10 VDC
0 to ±5 VDC / 0 to ±10 VDC
4 to 20 mADC
5 VDC
10 VDC
Approximately 10 VDC at maximum
frequency
(without frequency meter)
Approximately 5 VDC at maximum
frequency
(without frequency meter)
T
1
8 VDC
T
2
Pulse width T1: Adjust M310 (Pr.900)
Pulse cycle T2: Set with M040 (Pr.55)
(frequency monitor only)
When open
20 to 30 VDC
ON voltage: 1 V or less
1