Use multimeter to measure the ohm of pump(NOTE : pump must be disconnected with solar pumping inverter ) , for example: the pump’s cables are brown, blue and black. Take the measured Ohm record as below:
R1: between blue and black 39.3Ω
R2: between brown and black 24.8Ω
R3: between blue and brown 14.6Ω
Result: R1 = R2 + R3 and R2 > R3
The biggest ohm is between start wire and running wire
The middle ohm is between start wire and common wire
The smallest ohm is between running wire and common wire
- Motor’s Brown wire is common wire, and connects with the solar pump inverter AC output red wire.
- Motor’s Black wire is the start wire, and connects with the solar pump inverter AC output blue wire.
- Motor’s Blue wire is the running wire, and connects with the solar pump inverter AC output yellow wire.
Remark: The pump cables from different factories may different, please do the ohm measurement correctly.