Switching relay function
1. When a certain consumer is switched on in the switching relay «switching current», arriving at terminal 86, closes the electrical circuit to terminal 85 (weight).
2. As a result, the electromagnetic coil attracts a powerful contact, opposing the pressure of the spring, and thus completes the electrical circuit to pass «operating current».
3. In order to avoid a voltage drop, the operating current is applied in a short way to terminal 30 of the relay and from there, with the switch contacts closed, through terminal 87 further to the consumer.
4. Sometimes there is another terminal 87a. It is closely related to terminal 87, i.e. it has the same function.
Troubleshooting the switching relay
1. Terminal 30 must always be energized (voltage supply for working contact).
2. To check the voltage supply, remove the relay and tap the test lamp needle on terminal 30 in the relay base. No current: Defect in the current supply wire.
3. If the appropriate switch is on, there should be voltage at terminal 86, (voltage supply to the relay coil).
4. To check, tap on terminal 86 in the relay base with the needle of a test lamp.
5. No current: Defect in wire or switch.
6. Terminal 85 is the ground wire to the coil. Check the battery with a test lamp - + (e.g. terminal 30).
7. The relay coil is checked on the removed relay: connect terminal 86 to battery positive and terminal 85 to ground. The electromagnetic coil must pull the relay contact with a distinct sound, otherwise the relay is defective.
Temporary help in case of a faulty switching relay
1. Remove the relay from the socket.
2. Short terminal 30 and 87 in the relay socket with a paper clip or a piece of wire. Thanks to this, the corresponding consumer will receive a direct current.
3. To turn it off, disconnect the shorting jumper, since in this case this consumer is closed.
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