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electrical:relay [2017/07/08 23:42]
frater_secessus [normally open vs normally closed] 		electrical:relay [2018/01/11 14:55]
frater_secessus [Relays]
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 ====== Relays ====== ====== Relays ======
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 Electrical relays are devices used to **turn relatively heavy loads on/off**.  They are //triggered by small amounts of power// from an external source (usually a switch operated by the user) but //can pass larger amounts of power// to the load.  This reduces the cost and physical requirements of the switch and can help automate some processes. Electrical relays are devices used to **turn relatively heavy loads on/off**.  They are //triggered by small amounts of power// from an external source (usually a switch operated by the user) but //can pass larger amounts of power// to the load.  This reduces the cost and physical requirements of the switch and can help automate some processes.
- 
 A typical setup looks like this:  switch (and house power) --> relay --> load A typical setup looks like this:  switch (and house power) --> relay --> load
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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.
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 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 =====
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 Relays come in two basic types:   Relays come in two basic types:  
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   - **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 ===== 
- +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 · Last modified: 2020/10/11 19:48 (external edit)

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