To correctly actuate all of operation devices for three phases in the case where an operation condition changing switch such as a shutter switch has chattering in the operation device for one phase without giving bad effects for operation of the operation devices of the other phases.
Shutter switches 3 for three phases are serially connected to be composed in such a way that they cannot be electrically operated unless the operation by a motor is enabled for all of operation devices for the three phases. To each of the shutter switches 3 for three phases, each charge side relay contact 4 and a breaking side relay contact 5 are respectively connected in parallel. Otherwise, to both ends of the shutter switches 3 for three phases, charge side relay contacts 4 and breaking side relay contacts 5 are totally connected in parallel. Or otherwise, instead of the relay contacts 4, 5, mechanical contacts such as action recognition contacts or auxiliary contacts which are opened/closed corresponding to action of main shafts of the operation devices are connected.
WO/2015/177144 | SHIFTING DEVICE |
Next Patent: MEMBRANE SWITCH HAVING TRANSPARENT PART AND MANUFACTURE THEREFOR