Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi FR - S500 Instruction Manual

3

.3.8 Measurement of main circuit voltages, currents and powers

Measurement of voltages and currents
Since the voltages and currents on the inverter power supply and output sides
include harmonics, accurate measurement depends on the instruments used and
circuits measured.
When instruments for commercial frequency are used for measurement, measure
the following circuits using the instruments given on the next page.
Three-phase 200V
power input
Three-phase 400V
power input
Single-phase 200V
power input
Single-phase 100V
power input
Ar
3-phase
As
power supply
At
The FR-S520S-0.1K to 1.5K
and FR-S510W-0.1K to
0.75K do not have As, At,
Vt, Vs, W12 and W13.
Instrument
types
CAUTION
Use FFT (Fast Fourier Transforms) to measure the output voltage accurately.
It cannot be measured accurately with a meter or general instrument.
Input
voltage
Input
current
Inverter
W11
R
Vr
W12
S
Vs
W13
T
Vt
P
+
Typical Measuring Points and Instruments
Au W21
U
Vu
Av
V
Vv
Aw W22
W
Vw
N
V
-
157
Output
voltage
Output
current
To motor
:Moving-iron type
:Electrodynamometer type
:Moving-coil type
:Rectifier type