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Antonija Posted 15 years ago
Vocabulary
Hold-on supply
Hi,
Can you, please, explain this expression:
Contacts in relay K10 close to connect a hold-on supply to the relay and to provide an alternative supply route to the airbrake selector valve solenoid.
Can you, please, explain this expression:
Contacts in relay K10 close to connect a hold-on supply to the relay and to provide an alternative supply route to the airbrake selector valve solenoid.
Top answer
Sounds like a bad translation. ) This is old fashioned relay logic as opposed to solid state logic. You do something to energize the relay.
- Sounds like a bad translation.
- ) This is old fashioned relay logic as opposed to solid state logic.
- You do something to energize the relay.
- (magnetize its coil) It then "holds in" through one of its own "normally open" contacts.
- The "energized" state will continue until some contact in the holding circuit is opened, eg, by pressing a stop button.
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4 Answers
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Sounds like a bad translation.
In my youth, we called it a "holding circuit."
We would sometimes say that the circuit "seals in," or "seals itself in."
(I hope this is what you're talking about.)
This is old fashioned relay logic as opposed to solid state logic.
You do something to energize the relay. (magnetize its coil)
It then "holds in" th
In my youth, we called it a "holding circuit."
We would sometimes say that the circuit "seals in," or "seals itself in."
(I hope this is what you're talking about.)
This is old fashioned relay logic as opposed to solid state logic.
You do something to energize the relay. (magnetize its coil)
It then "holds in" th
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Avangi, thank you very much. Your explanation is clear and helpful.
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Hi, Antonija.
I meant to add: Sometimes it's said that the circuit "latches in."
This is a better description than "seals in," but it was my habit to avoid it because there are also "latching relays" which operate quite differently - although they can accomplish the same purpose.
They're built with two separate coils, one to latch/energize the relay and one to unlatch/de-energize
I meant to add: Sometimes it's said that the circuit "latches in."
This is a better description than "seals in," but it was my habit to avoid it because there are also "latching relays" which operate quite differently - although they can accomplish the same purpose.
They're built with two separate coils, one to latch/energize the relay and one to unlatch/de-energize
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