Today we learned about Relays. Relays are used throughout the automobile. Relay which come in assorted sizes, ratings, and applications are used as remote control switches. A typical vehicle can have 20 relay or more.
Relay application:
- Remote control electric switches that are controlled by another switch, such a horn switch or a computer as in a power train control module.
- Relays allow a small current flow circuit to control a higher current circuit.
Relay operation :
- All relay operate using the same basic principle.
- Relay have two circuit: A control circuit (GREEN) and load circuit (RED). The control circuit has a small control coil while the load circuit has a switch.
Normally closed Relay
- The operation of a normally closed relay in the same to that of a Normally open relay except backwards.
- When the relay control coil not energized, the relay switch contacts are closed completing the circuit though pins 2 and 4.
- When the control coil is energized, the relay switch contact open, switch beaks the circuit open and no continuity exist between pin 2 and pin 4.
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