Frecon PV Series - 2.3 Wiring Diagram Between VFD and Single Phase Motor

PV series Solar Pumping Inverter
- 15 -
2.3 Wiring diagram between VFD and single phase motor
2.3.1 Single phase motor introduction
Single phase motor generally means asynchronous single phase motor powered by single phase
AC 220V, there’re two phase winding in motor stator and motor rotor is common squirrel cage. The
distribution of two phase winding and different power supply will lead to different starting
characteristics and operating characteristics
Usually single phase motor is with single capacitor or double capacitor, photos of motor are as
below:
Figure 2-5 Motor with single capacitor and double capacitor
Single phase motor is consisted of main winding, secondary winding, capacitor and centrifugal
switch, internal wiring of single phase motor with single capacitor is as below:
Main
winding
Secondary
winding
Starting
capacitor
U1
U2
Z1
Z2
M
220VAC
Figure 2-6 Operation mode: Internal wiring of motor with single capacitor
Main
winding
Secondary
winding
Starting
capacitor
U1
U2
Z1
Z2
M
220VAC
Centrifugal
switch
Figure 2-7 Starting mode: Internal wiring of motor with single capacitor
Internal wiring of single phase motor with double capacitors is as below: