| 摘要 |
<p>PURPOSE:To prevent an auxiliary compressor from overheating by counting the operating time, and forcibly stopping the operation when the operating time exceeds the normal time. CONSTITUTION:If a governor 2 for detecting pneumatic pressure indicates a pressure decrease when an operation switch 1 of a pantograph is closed, a contactor 3 of an auxiliary compressor 5 is excited. At this time, the operating time of the compressor 5 is counted by a time relay 7, and when the operating time reaches the prescribed time, the relay 7 is operated. A contact 7b is opened by the operation of the relay 7, the contactor 3 becomes inoperative, and when the contact 3a is opened, the compressor 5 is stopped. Thus, the overheat of the compressor can be prevented.</p> |
