| 摘要 |
PURPOSE:To prevent the runaway of a motor from being generated, by stopping the feed of controlling voltage, when an abnormal state is generated on the controlling voltage from a controlling voltage source. CONSTITUTION:To a motor driving circuit 33, from a controlling voltage source 38, the controlling voltage of + or -15V is applied. So far as the motor driving circuit 33 is concerned, by error signal between driving command from a controlling section 39 and rotational position detecting output from an encoder 35, an output circuit 331 is controlled, and a motor 34 is rotationally controlled. When at the time of working in this manner, a voltage feed line from the controlling voltage source 38 is short-circuited or the disconnection and the like are generated, and an abnormal state is generated on feed voltage, then the normally closed contacts 32b, 37b of relays 32, 37 are released, and the controlling voltage source 38 is separated from a power source 36, and the motor 34 and the output circuit 331 are separated from a power source 31. |
