14 Mini Maestro User Guide
www.controltechniques.com Issue Number: 5
Figure 3-5 Single-phase and three-phase power supply circuits
Transformer ratings
Power rating
Use the following equation:
Pt = {(Paz x 1.7) + 80} x 1.73 ÷ √(n + 2)
Where:
Paz = (Vm1 x Cm1) + (Vm2 x Cm2) + ...
Vm = Motor speed in radians per second (RPM ÷ 9.5)
Cm = Nominal torque in Nm
1.73 ÷ √(n + 2) Empirical conversion factor for drives connected in parallel
Secondary voltage
Select the required secondary voltage, as follows:
With no load: V2 ≅ V1 x 1.4
With full load: V2 ≅ V1 x 1.2
DC supply to the drive Secondary voltage VRMS
63 45
21 15
80 56
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