All modules are using the 2ACE motor protector module. This is a wye/delta start system. All tests were done with all compressors loaded to step 75.
I have had problems with the compressors overloading and kicking out the disconnect/breaker for the individual circuit. None of the amperage readings on the microprocessor match amprobe readings. I have verified the amprobe readings with a number of other amprobes to take that out of the equation. The micro reads between 22 and 50 amps lower than the actual amp draw. This is happening on 2 machines, all 8 circuits. The micro is programmed for the exact RLA per compressor. I was forced to reprogram the unload point to 85% in order to keep the RLA in line.
Does anyone know if there is a way to calibrate the amp draw on the microprocessor. All the inputs are into the IO board #1. I have checked the inputs voltages to the IO board and have about 11.8 volts to it. I was not real hot on how they supplied voltage to the board, running 120V to a 240V transformer primary, therefore getting 12 volts out a 24 volt secondary so I tried a 120V/10V supply but nothing changed.
Any help would be appreciated.