
B–65162E/03
4. SPECIFICATIONS
73
[How to calculate the power equipment capacity]
Calculate the power equipment capacity using the formula below.
Power supply
capacity (kVA)
Rated capacity calculated in Section 3.3 or 3.4 (kW)
Rated capacity of power supply module (kW)
=
×
Power supply capacity of power supply
module having rated output (kVA)
(See Table 4.1.1 (a), (b))
NOTE
Select a power supply for which, when the motor is
accelerated, the input voltage variation does not exceed 7%
(see Subsection 5.2.1 for details).
[How to calculate the input current of the PSM (PSMR)]
Calculate the input current of the PSM (PSMR) by using the formula
below. Refer to the result when selecting the MCC, power cable, and
circuit breaker 1, to be connected to the PSM input section.
PSM input
current (Arms)
Power equipment capacity (kVA)
3 Nominal supply voltage (Vrms)
=
× 1.2 (margin)
ȯ
Ǹ
NOTE
Normally, assume the nominal supply voltage (Vrms) to be
200Vrms.