I'm setting up a circuit for reverse polarity motors (windows), using 3 relays and 1 mom/off/mom switch.
Up works fine, but he down would earth through the up side, unless there is a diode in place to stop the current going the wrong way.
Please excuse the crudety of the pic:
When switch is set to Up, it activates relays 1 & 2 (which control the polarity) and 3, which activates the main power. All good. When down, I want to activate relay 3, but leave 1 & 2 as is. I figure I need a diode at point X to prevent a reverse circuit activating the relays 1&2?