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electrical:relay

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electrical:relay [2018/01/11 11:55]
frater_secessus [normally open vs normally closed]
electrical:relay [2018/01/11 11:55] (current)
frater_secessus [Relays]
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 The most common relay campers are exposed to is the solenoid for [[electrical:​12v:​alternator|charging house batteries from the coach'​s alternator]]. ​ When the vehicle is turned on power activates the solenoid and connects the house and vehicle electrical systems. The most common relay campers are exposed to is the solenoid for [[electrical:​12v:​alternator|charging house batteries from the coach'​s alternator]]. ​ When the vehicle is turned on power activates the solenoid and connects the house and vehicle electrical systems.
 Relays are also useful for powering loads from [[electrical:​12v:​lvd|LVD]] or [[electrical:​solar:​charge_controller|Charge Controller]] LOAD outputs. ​ This allows powering larger loads than the controller is rated for.  Relays are also useful for powering loads from [[electrical:​12v:​lvd|LVD]] or [[electrical:​solar:​charge_controller|Charge Controller]] LOAD outputs. ​ This allows powering larger loads than the controller is rated for. 
 +
 +Common uses:
 +  * battery isolation when [[electrical:​12v:​alternator|alternator charging]]
 +  * [[electrical:​12v:​lvd|low voltage disconnect (LVD)]]
 +
 ===== normally open vs normally closed ===== ===== normally open vs normally closed =====
 Relays come in two basic types:  ​ Relays come in two basic types:  ​
   - **Normally Open (NO)** - the output circuit is open/​incomplete when the relay is resting. ​ No power flows. ​ The controlled device is **off** until the relay is triggered. ​ //This is usually the default.//  ​   - **Normally Open (NO)** - the output circuit is open/​incomplete when the relay is resting. ​ No power flows. ​ The controlled device is **off** until the relay is triggered. ​ //This is usually the default.//  ​
   - **Normally Closed (NC)** - the output circuit is closed/​complete when the relay is resting. ​ Power flows. ​ The controlled device is **on** until the relay is triggered.   - **Normally Closed (NC)** - the output circuit is closed/​complete when the relay is resting. ​ Power flows. ​ The controlled device is **on** until the relay is triggered.
- 
- 
 ===== latching relays ===== ===== latching relays =====
 Normally it takes power from the trigger source to operate the relay. ​ A latching relay, however, moves from position to position and locks there even when power is removed. ​ Normally it takes power from the trigger source to operate the relay. ​ A latching relay, however, moves from position to position and locks there even when power is removed. ​
  
electrical/relay.txt ยท Last modified: 2018/01/11 11:55 by frater_secessus