Single phase ac pump connect to inverter step as below:

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

Conclusion:

  1. Motor’s Brown wire is common wire, and connects with the solar pump inverter AC output red wire.
  2. Motor’s Black wire is the start wire, and connects with the solar pump inverter AC output blue wire.
  3. 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.

What’s inverter will doing while pump wire connected wrong?

Situation1:  inverter stop and show OFF SOLAR LOW POWER  Situation2:  inverter stop and showing: OFF AC OUTPUT OVER CURRENT;   Situation4: inverter stop and showing: OFF AC OUTPUT  SHORT CIRCUIT