What voltage should I read between SC (signal common) and Ground on a power supply option board 900-2RS or 900-4R/4RL?
If the power supply jumper is set for 12VDC, you would expect to measure 12VDC between SC and Ground on the option board.
If the power supply jumper is set for 24VDC, you would expect to measure 24VDC between SC and Ground on the option board.
It is normal to read a small amount of voltage between input terminals and Ground on the option board.
People will sometimes attempt to measure voltage between SC and an input terminal on the option board. This is not appropriate since voltage must always be referenced to a Ground point, which is true zero.
DISCLAIMER:
INFORMATION PROVIDED THROUGH THIS SITE IS PROVIDED TO YOU AS IS WITHOUT ANY EXPRESS REPRESENTATIONS OR WARRANTIES
OF ANY KIND, AND WE MAKE NO REPRESENTATION OR WARRANTY THAT THIS SITE(OR ANY INFORMATION PROVIDED IN RESPONSE TO
YOUR INQUIRY), WILL BE ACCURATE, COMPLETE, OR ERROR-FREE.
YOU AGREE THAT YOU MUST EVALUATE ALL INFORMATION AND RESPONSES, AND THAT YOU BEAR ALL RISKS ASSOCIATED WITH, THE
USE OF THIS SITE, INCLUDING ANY RELIANCE ON THE ACCURACY,COMPLETENESS, OR USEFULNESS OF ANY INFORMATION OR MATERIALS
MADE AVAILABLE THROUGH THIS SITE.