Hi all, I’m working on a project to monitor and log power consumption of a 3-phase motor and I have a few questions. The motor is controlled by a VFD and will rotate in one direction for 6 seconds then change directions for 6 seconds and repeats.
Right now I have 3 transformers to step down 230V L-L to use as my reference voltages for phases A,B,C. Phase_a is wired with L1&L2, phase_b is L2&L3, phase_c is L3&L1.
Is this correct wiring for each phase?
I am using 3 ECS1050 CTs and they are connected to the terminals of the motor. Each are hooked around one of the 3 terminal wires of my motor pointing in the same direction.
How do I properly configure the CTs? Do each get a different VRef, so phase_a, phase_b, phase_c? Should enable “Allow negative power value”? And do I enable “Double”?
To calculate total power consumption of the motor is that as simple as summing the 3 watt values I get from the CTs or do I use a different formula?
Any input is greatly appreciated