Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi Electric A800 Plus Instruction Manual

5.2
Measurement of main circuit voltages,
currents and powers
Since the voltages and currents on the inverter 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 inverter output side
When the wiring length between the inverter and the motor is large, the meters and CTs may generate heat due to line-to-line
leakage current. Therefore, choose equipment which has enough capacity for the current rating.
To measure and display the output voltage and output current of the inverter, it is recommended that the terminal AM and FM/
CA output functions of the inverter are used.
Three-phase
power supply

Measurement of main circuit voltages, currents and powers

Input voltage
Input current
Inverter with
converter unit
Ar R/L1 U
W11
Vr
As V
W12 S/L2
Vs
W
At T/L3
W13
Vt
P/+ N/-
V
+ -
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Output voltage
Output current
Au
W21
Vu
To the motor
Av
Vv
Aw
W22
Vw
5
105