Electrical Design
‑54‑
3.2.2 Selecting a Main Contactor
Depending on the drive capacity, you can order it with a main contactor (option +
F250).
3.2.3 Selecting a Supply Transformer
Take the following guidance into consideration:
1. Determine the transformer apparent power according to the following formula:
SN (kVA) = 1.6 x Total power of motor shaft (kW)
2. Determine the rated voltage of the secondary winding of the transformer according
to the rated input voltage of the drive.
3. Make sure that the transformer meets the grid specifications defined for the drive in
the following aspects:
● Rated input voltage, allowable voltage change, and unbalance degree
● Rated frequency and allowable change
● Short circuit withstand strength (IEC) or short circuit current protection (UL or
CSA)
Figure 3‑3 Selecting a supply transformer
To Next Page
Loading...
