161
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.2 Measurement of main circuit voltages, currents, and powers
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7.2
Measurement of main circuit voltages, currents,
and powers
Since the voltages and currents on the converter unit power supply and output sides include harmonics, measurement data
depends on the instruments used and circuits measured. When instruments for commercial frequency are used for
measurement, measure the following circuits with the instruments given on the next page.
NOTE
• When installing meters etc. on the output side of the converter unit:
When the wiring length between the converter unit and the inverter is long, the meters and CTs may generate heat due to line-
to-line leakage current. Therefore, choose the equipment which has enough allowance for the current rating.
Measuring points and instruments
*1
When the setting of
Pr.195 ABC1 terminal function selection
is the positive logic.
+
-
Ar
As
At
Vr
Vs
Vt
W11
W12
W13
V
Converter unit
Three-phase
power supply
To the inverter
Input voltage
Input current
R/L1
S/L2
T/L3
P/+
N/-
Item
Measuring point
Measuring instrument
Remarks (reference measured value)
Power supply voltage
V1
Between R/L1 and S/L2,
S/L2 and T/L3, and T/L3
and R/L1
Digital power meter (designed for
inverter)
Commercial power
Within permissible AC voltage fluctuation. (Refer to
.)
Input current
I1
Line current at R/L1, S/L2,
and T/L3
Input power
P1
At R/L1, S/L2, and T/L3,
and between R/L1 and S/
L2, S/L2 and T/L3, and T/
L3 and R/L1
P1 = W11 + W12 + W13 (3-wattmeter method)
Input power factor
Pf1
Calculate after measuring input voltage, input current and input power.
Converter output
Between P/+ and N/-
Tester such as a digital
multimeter.
Inverter LED indication 1.35 × V1
Input signal
Across terminals RDI, OH,
RES(+) and SD (for sink
logic)
Tester such as a digital
multimeter, or moving-coil type
instrument (internal resistance
50 k
Ω
or more)
Voltage when terminal is open: 20 to
30 VDC.
Voltage when signal is ON: 1 V or
less.
Terminal SD
is a common
terminal.
Fault signal
Between A1 and C1
Between B1 and C1
Digital multimeter or other tester
Continuity test
Normal: discontinuity across A1 and C1 (continuity
across B1 and C1)
Fault: continuity across A1 and C1 (discontinuity
across B1 and C1)
Pf
1
=
P
1
I
1
x
x 100%
3V
1
Содержание FR-CC2-N Series
Страница 61: ...60 3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT 3 4 Checklist before starting operation MEMO ...
Страница 137: ...136 5 PARAMETERS 5 10 Checking parameters changed from their initial values initial value change list MEMO ...
Страница 153: ...152 6 PROTECTIVE FUNCTIONS 6 6 Check first when you have a trouble MEMO ...
Страница 165: ...164 7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 7 2 Measurement of main circuit voltages currents and powers MEMO ...
Страница 171: ...170 8 SPECIFICATIONS 8 3 Outline dimension drawings MEMO ...
