Home Forums General Discussion Technical Questions Otis RCB-II, MCS 312

I had a new construction 311(Geared machine)that used to get locked up when it lost power also.It went on Fire Service and it had to be cleared by clearing the batram and sacram with the SVT.When I told my boss about it,he checked with engineering.They came back with the battery was bad on the RCBII board.This was my first 311 on the route.The Mod 311's/411's RCB II board faces you.On the construction product(E311/E411)it slides in a slot.When I slid the RCB II board out,I found the battery on the board unplugged.A few weeks beforehand,there was a TIP upgrade done to replace Siemens relays that had defective springs.Check the battery on your RCB II board.Good Luck.