I have a PS-4 with the GLX-PCB-PRO board. I am developing software to drive my VSP pump motor with an external industrial VFD instead of the Hayward drive electronics, which just fails too often.
I have the system working. Using an ESP32 micro driving two serial ports and RS485 converters. One port talks to the PS-4 the other talks to the VFD. I translate PS-4 commands to VFD commands and turn on/off/change speed of the pump.
While developing this I found that the com ports on the PS-4 have a 120VAC component on all pins. I actually got a mild shock touching one of the RS485 wires. There is still 11VDC across the 1 and 4 pins (1 and 3 on the board header locations) of the ports, and the RS485 differential signal is fine. I use the 11VDC to power the ESP32. I see the AC voltage if I measure from a pin to a ground point in the PS-4 cabinet.
I suspect it is leakage from a switching mode power supply on the GLX-PCB-PRO board.
My board had several features broken, AUX1 was burned out, Lights stuck on, then the filter relay drive burned out. After finding the 120VAC I decided to replace the board.
The new board has the same 120VAC on the com port pins. I am wondering if anyone else has this AC leakage onto their com ports?
I have the system working. Using an ESP32 micro driving two serial ports and RS485 converters. One port talks to the PS-4 the other talks to the VFD. I translate PS-4 commands to VFD commands and turn on/off/change speed of the pump.
While developing this I found that the com ports on the PS-4 have a 120VAC component on all pins. I actually got a mild shock touching one of the RS485 wires. There is still 11VDC across the 1 and 4 pins (1 and 3 on the board header locations) of the ports, and the RS485 differential signal is fine. I use the 11VDC to power the ESP32. I see the AC voltage if I measure from a pin to a ground point in the PS-4 cabinet.
I suspect it is leakage from a switching mode power supply on the GLX-PCB-PRO board.
My board had several features broken, AUX1 was burned out, Lights stuck on, then the filter relay drive burned out. After finding the 120VAC I decided to replace the board.
The new board has the same 120VAC on the com port pins. I am wondering if anyone else has this AC leakage onto their com ports?
