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The visual is much appreciated RedSnake, really helps. Waross, I see your point about the using the wire runs efficiently, and avoiding the 3 wire junction. T3>A1 solves both.

Actually, would this be a better solution? Power would flow through the Estop, and Start buttons before reaching the contactor. The other way I had it, power would flow straight to the contactor.https://files.engineering.com/getfile.aspx?folder=c69891d8-3c76-4b7c-978d-ac46fafa77e7&file=Capture.JPG

I think we are making progress, and I am understanding the circuit better. Is it correct that if I had 3 phase power and L3/T3 were taken, then I would need an add on auxiliary...

@Jraef, I see now, the black wire should be on the other side of the power on button correct? Front side would bypass the button (like I had it).

@Waross, this diagram shows L1 and L2 fused and from the breaker. R and S from the contactor.https://files.engineering.com/getfile.aspx?folder=54be75ba-1ac5-4377-b75d-c0a720bd8835&file=servo_power3.JPG

Here is the contactor diagram. Connections at the servo; L1 and L2 are the control circuit, R and S is for single phase Main power. https://files.engineering.com/getfile.aspx?folder=b61d1b0c-2e2d-4139-a1d5-652aa4993cd0&file=contactor_diagram.JPG

Waross, what is non standard? Just wanting to learn. I understand now about using the L3 and T3 terminals as the auxiliary contacts. Edit; I see I have a wire color mislabeled @ L1 (should be black, not white)

@RedSnake, agree the L1 and L2 are confusing, but that is how the drive is labeled. Terminal T is used for 3 phase.

@Waross, appreciate it. Is this better (blue wire for quick representation only)? I am learning that others in the past have not always set up things properly, so I want to learn myself this time. The CB and fusing is from the manual, size and...

I am currently in the middle of learning electrical circuits for a project so go easy on me. I am wanting to make sure how I have our motor contactor laid out is correct and safe. If not, where can I improve? Top L is incoming supply, 220V single phase that routes through a circuit breaker...

TiCl4, Thanks again for breaking this down for me. Yes, I need to familiarize myself with the values and their applied intentions. The efficiency I used came from a pump sheet we have, 74.89% is what the Efficiency is listed as, based on the 150 gpm flow of our system.

I really appreciate the responses. TiCl4; your equation is slightly different than the one I was using. If I use yours with the below variables; Pump power draw @ flow = 9.35 hp Efficiency @ flow = 74.89% Cp Specific Heat (water) = 1 btu/lb f Liquid mass flow = 150 GPM Using your equation i...

I am working on a project where we are sizing a chiller for a system. The system circulates water using a pump and a VFD to control the pump. The VFD will adjust the pump output at specific times. I am trying to find the heat produced by the pump. I have gone through the calculation for the...