I'm doing a MOD that we sold MAC operators for. I've done a couple of Macs in the past, but only on hydro units. There is a switch mounted on the operator that is supposed to be used on traction cars according to the info I received. Is that used for unintended motion somehow? Not sure what to do with it. It's a Schindler TX controller and the print shows nothing for the Mac. Any assistance would be great.