Measurement Of Main Circuit Voltages, Currents, And Powers - Mitsubishi Electric 800 Series Hardware 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 inverter-to-motor wiring length 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.
To measure and display the output voltage and output current of the inverter, it is recommended to use the terminal AM and
FM/CA output functions of the inverter.
Three-phase
power supply
Input voltage
Input current
Inverter/
converter unit
Ar R/L1 U
W11
Vr
As S/L2 V
W12
Vs
At W
T/L3
W13
Vt
P/+ N/-
V
+ -
Au
W21
Vu
Av
Vv
Aw
W22
Vw
5. PRECAUTIONS FOR MAINTENANCE AND INSPECTION

5.2 Measurement of main circuit voltages, currents, and powers

Output voltage
Output current
To the motor
1
2
3
4
5
6
7
8
9
10
111