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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. | ||
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| + | Common uses: | ||
| + | * battery isolation when [[electrical:12v:alternator|alternator charging]] | ||
| + | * [[electrical:12v:lvd|low voltage disconnect (LVD)]] | ||
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| ===== 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. | ||
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| ===== 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
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