How to use relay to connect wire?
1, Preparation work before connection
(A) Clear specifications of relays and wires
Before connection, be sure to clearly understand the specifications of the relay, including the rated voltage, current, as well as contact type and load capacity. At the same time, according to the circuit needs to choose the appropriate specifications of the wire, wire cross-section area to be able to carry the current of the circuit controlled by the relay, to avoid excessive current lead to wire heating or even cause safety accidents. For example, for relays controlling high-current devices, a wire with a larger cross-sectional area should be selected.
(B) Prepare the necessary tools
Prepare the necessary tools for connection, such as wire strippers, screwdrivers, soldering iron, solder wire, rosin, etc.. Wire strippers are used to strip the wire insulation; screwdrivers are used to tighten the fixed screws and terminals of the relay; soldering iron, soldering wire and rosin are used to weld the connection points to ensure a firm connection.
(C) Planning the circuit layout
Plan the circuit layout in advance to determine the installation position of the relay on the circuit board, as well as the direction of the wires. Reasonable layout not only makes the circuit neat and beautiful, but also reduces electromagnetic interference and improves the stability of the circuit. At the same time, make sure that there is enough space around the relay to facilitate subsequent connection operations and maintenance.
2, relay coil and control circuit wire connection
(A) Handling of control circuit wires
Use wire strippers to strip the insulating sheath from both ends of the control circuit wires connected to the relay coil to an appropriate length, generally 1 - 2 cm, to expose the internal metal wires. Be careful not to damage the wires; if the wires are damaged, current transmission may be affected.
(B) Connecting the coil pins
Connect the stripped wires to the pins of the relay coil. For relays with polarity requirements, connect them in strict accordance with the positive and negative markings, generally the red meter pen is connected to the positive pole and the black meter pen is connected to the negative pole. The connection can be made by welding or screw fastening. When welding, first apply appropriate amount of rosin on the pins and wires, and then melt the solder wire with soldering iron to firmly connect the pins and wires; if screw fastening is used, insert the wires into the terminals and tighten the screws to ensure a tight connection.
(C) Checking the reliability of the connection
After the connection is completed, gently pull the wire to check whether the connection with the coil pins is firm. Use the resistance gear of the multimeter to measure the resistance of the connection point, the resistance value should be close to zero, if the resistance value is too large, it means that the connection may have poor contact problems, need to be reconnected.
3, relay contacts and load circuit wire connection
(A) Determine the load circuit wires
According to the type and location of the load controlled by the relay, determine the load circuit wires connected to it. Also use wire strippers to strip the insulating sheath at both ends of the wire.
(B) Connecting the contact pins
Connect the load circuit wires to the contact pins of the relay. For normally open contacts, when the relay is not energized, the contacts are in the open state, when the relay is energized, the contacts are closed and the load circuit is turned on; for normally closed contacts, the opposite is true. When connecting, pay attention to the distinction between normally open and normally closed contacts to ensure that the connection is correct to achieve accurate control of the load circuit. Connection method is similar to the coil pin connection, welding or screw fastening can be used.
(C) Insulation treatment
After the connection is completed, insulate the connection point, use insulating tape or heat-shrinkable tubing to wrap the connection point tightly to prevent short-circuit and electric shock accidents. Ensure that the insulating material completely covers the connection point, leaving no metal wires exposed.
4, Check and test after connection
(A) Appearance check
After the connection is completed, first carry out an appearance check. Check whether the relay is firmly installed, whether the wires are neatly connected, and whether the insulation treatment is in place. Make sure that there are no wires crossed, tangled or loose, and that there is no debris around the relay.
(B) Power-on test
After ensuring that the appearance of the inspection is correct, carry out power test. Turn on the power to the control circuit and observe whether the relay operates normally and whether a clear “click” sound can be heard. At the same time, observe whether the load circuit works as expected, such as whether the connected motor rotates, whether the light bulb lights up, etc. If any abnormality is found during the test, please contact us. If any abnormality is found during the test, such as relay inactivity, smoke, odor, etc., immediately cut off the power supply and investigate the cause of the malfunction.
At MobikeChip, we provide high quality relay products and professional technical support. Mastering how to use relays to connect wires is a critical step in building stable and reliable electronic circuits. If you have any questions about relay connection, selection or other electronic components, please feel free to visit MobikeChip website, our professional team will be happy to serve you.
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