| 摘要 |
PURPOSE:To permit a compressor not to be again run without repair in turning off a power supply by closing an exhaust valve to prevent lubricating oil for the compressor from being all exhausted when a level switch has any failures and providing a holding circuit for indicating the failures. CONSTITUTION:When a level switch 8 in a drain has any failures in running to keep closing the a contact 8a, a first timer 12 is magnetized to close the a contact 12a so that a second timer 13 is magnetized. And after a predetermined time a timing b contact 13b of the second timer 13 is opened so that an exhanst valve 10 is closed to stop exhaust of drain. Since at the same time a second auxiliary relay 21 is also demagnetized, the second timer 13 is kept magnetized so that a holding circuit Y of a contact 18 of a stop switch is formed to light both a running lamp 14 and stop lamp 15 for indicating the failure. |
