Hayward Prologic "Spa Filter VSP Comm Error"

[Dr. T]

The Prologic controller and Tristar 2.70 THP VS pump have ceased communicating. I'm trying to figure out if the issue is on the Prologic controller side or the pump side. The pump runs fine when disconnected from the Prologic and being controlled by its own controller. The wire between the two tests fine. I tested the voltage on the terminal block connector in the Prologic, interface cable disconnected. It is a constant 115V on all 4 of the pins (+12V, A, B, Com) in the Prologic whether or not the Spa Filter button is on or off. When I test the pump by itself (disconnected from the Prologic) the pump's own controller is putting out 50v to the A and B connections when on at full speed and 0v when off. From this can I assume the issue is with the Prologic PCB? If so I plan on ordering the OmniPL Retrofit kit to resolve the problem and upgrade the system. I also noticed that the drain wire was not connected between the COM (pump) and terminal 4 (Prologic controller) terminals by the original installer. Should it be? It has been running fine this way for a few years. Thank you!

 

[kimkats]

Here is a bump to get more eyes on your post.

 

[ChrisABS]

Are the dip switches inside of the pump in the right order. For the Omni PL they all need to be on 0. Not sure for the Prologic.

 

[Dr. T]

Are the dip switches inside of the pump in the right order. For the Omni PL they all need to be on 0. Not sure for the Prologic.

Yes, for this setup the #2 dip switch is on.

 

[1poolman1]

The Prologic controller and Tristar 2.70 THP VS pump have ceased communicating. I'm trying to figure out if the issue is on the Prologic controller side or the pump side. The pump runs fine when disconnected from the Prologic and being controlled by its own controller. The wire between the two tests fine. I tested the voltage on the terminal block connector in the Prologic, interface cable disconnected. It is a constant 115V on all 4 of the pins (+12V, A, B, Com) in the Prologic whether or not the Spa Filter button is on or off. When I test the pump by itself (disconnected from the Prologic) the pump's own controller is putting out 50v to the A and B connections when on at full speed and 0v when off. From this can I assume the issue is with the Prologic PCB? If so I plan on ordering the OmniPL Retrofit kit to resolve the problem and upgrade the system. I also noticed that the drain wire was not connected between the COM (pump) and terminal 4 (Prologic controller) terminals by the original installer. Should it be? It has been running fine this way for a few years. Thank you!

You have 50V or 115V on the RS485 connector? That's a problem.

 

[Dr. T]

You have 50V or 115V on the RS485 connector? That's a problem.

Yes. I was very surprised. Should be a low voltage signal right? Perhaps I'm missing something. I unplugged the green 12V,A, B, Com connector from the upper left of the Prologic PCB and tested the voltage on each of the 4 pins. On each of the pins I got 115V testing between the pin and the main equipment ground wire. This output was the same on each pin regardless of whether the filter button was on or off. When the pump is running (disconnected from the Prologic, all dip switches on, controlled by the pump's own controller) and I test the voltage for the A and B inputs on the pump I get 50V. If I turn the pump off with the pump's own controller I get 0V. Again using the voltmeter between the pin and the main ground wire. The pump runs perfectly when controlled by its own controller.