414
Fig 9b: Single Phase Wiring without External Capacitor Box
Capacitor Box
3.6 Single Phase Motor Wiring Instruction
To wire single phase motors to the Sunverter 4, if the motor has an external capacitor
box, wire as per Fig 9a. where you connect the SV4 terminals A and M to the capacitor
box. If the motor does not have an external capacitor box, wire as per Fig 9b, where
you connect the SV4 terminals A, M, & C to the motor. It should be noted that flow rate
and head performance may be reduced by as much as 15% when capacitors are
removed.
*Capacitors in terminal box for surface pumps
CAUTION
Ensure to connect the wires according to the instructions,
incorrect connection may lead to abnormal operation of the
system.
Wiring
If the single-phase motor windings connection cannot be identified, follow these steps:
Step 1: Resistance Test
Label the winding cables A, B, and C for ease in identification.
Test the resistance between each pair of the connection parts with a multimeter and
note the Ohm readings. See example below of readings taken and calculations to help
identify correct winding.
Ÿ Reading from Point A - B - 7Ω
Ÿ Reading from Point A - C - 5Ω
Ÿ Reading from Point C - B - 12Ω
Fig 9a: Single Phase Wiring with External Capacitor Box
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