I have a B needs ZRN alarm 300 and I have tried changing the 1815 and 1814 bits as described in fanuc book to no avail. This is on Mori Seiki MH50 with a 16 control. We did have a major power outage and the machine was not powered down so it single phased. the contacts on spindle drive burn out as well as some relays. All pretty much on 100v system.

when i do a zero return the B axis just continually rotates. Any help.