| 摘要 |
<p>PURPOSE:To detect and report a failure of a device for cooling heated parts in controllers such as inverters and servo-units. CONSTITUTION:A voltage is generated across a detecting resistor 4 according to the current flowing through a fan motor. The voltage is fed to a No.1 comparator 6 and No.2 comparator 7 through a differential amplifier 5. If a fan motor 2 has a trouble, the output of the comparator 6 or 7 is reversed, setting the output of a latch circuit 10 to a high level, i.e., outputting a trouble detection signal Sk and indicating 'TROUBLE' on a display 12.</p> |
