Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi Electric FR-E700EX Instruction Manual

6.2

Measurement of main circuit voltages, currents and powers

Since the voltages and currents on the drive 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.
 When installing meters etc. on the drive unit output side
When the drive unit-to-motor wiring length is large small-capacity models, 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.
To measure and display the output voltage and output current of the drive unit, it is recommended to use the FM-SD
terminal output function of the drive unit.
Three-phase
power supply
Instrument types
Measurement of main circuit voltages, currents and powers
Input voltage
Input current
Drive unit
W11
Ar R/L1 U
Vr
W12 V
As S/L2
Vs
W13
At T/L3 W
Vt
P/+ N/-
V
+ -
Examples of Measuring Points and Instruments
Output voltage
Output current
Au
W21
Vu
Av
To the motor
Vv
Aw
W22
Vw
: Moving-iron type
: Electrodynamometer type
: Moving-coil type
: Rectifier type
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