Topic-icon Voltage Through Relay Coils

1 week 2 days ago - 1 week 2 days ago #503 by
When checking circuits with relay coils, a very simple rule can be utilized. If the coil is energized, all input voltage is dropped through the coil windings. If the coil is relaxed (not energized) the input voltage can be read "downstream" from the relay itself.

The controlling system could be a digital LRU with a transistor or amp activating the ground to the relay. It could be a thermal switch, mechanical switch, or even possibly the closed/open contacts of another relay.

If the input cannon plug to the controlling unit is removed (or LRU removed from rack), the coil voltage of a relay can be checked at the plug. The relay can be activated by supplying your own ground with a jumper wire. (Caution should be used when supplying a ground to a relay circuit. Any possible damage to secondary systems should be ruled out before connecting a hard ground....... don't let the smoke out!!!)

Last edit: 1 week 2 days ago by .

Please Log in or Create an account to join the conversation.

Time to create page: 0.137 seconds
English Arabic French German Italian Japanese Korean Norwegian Portuguese Russian Spanish

 Random acts of kindness are contagious!!