TM 5-3895-374-24-2 Problem Cause Solution/Reference Key switch left OFF Control fuse blown PLC failure See PLC manual Control panel in "training" mode Motors fail to start Generator sets not both running Interlocking not in sequence Control relay failure Overload tripped Breaker open Motor unplugged 4-4-5.  Programmable Logic Controller (PLC) Problem Cause Solution/Reference No controls operating Processor failure (fault light on) Replace processor See PLC manual Memory failure (fault) Replace EE module Fuse blown in power supply Control circuit fuse blown Portions of system working - others not Input card failure Output card failure Control fuse blown on cards See electrical drawing AA00303 Motors fail to start Control circuit fuse blown page 4 - 8