1. Replace small contactors: the contacts of the central relay have a certain ability to carry load, and when the load capacity is relatively small, it can be used to replace the use of small contactors, such as electric roller shutters and the control of some small household appliances. This can not only play the intention of control, but also save space, so that the control part of the electrical appliance is more exquisite.
2. Add the number of contacts: In the circuit control system, adding a central relay to the line will not only not change the control mode, add the number of contacts, but also facilitate repair.
3. Add contact capacity: Although the contact capacity of the central relay is not very large, it also has a certain ability to carry the load, and the current required for its drive is very small, so the contact capacity can be expanded with the central relay. The central relay is used in the control line, and other loads are controlled through the central relay to achieve the intention of expanding the control capacity.
4. Conversion contact type: In the I industry control line, a central relay can be connected in parallel with the original contactor coil. The normally closed contact of the relay is used to control the corresponding components, and the type of connection can be converted to achieve the control intention by using the normally closed contact of the contactor.
5. Used as a switch: In some control lines, the on-off of some electrical components is often controlled by the central relay and the opening and closing of the Qi contact. For example, the automatic degaussing circuit commonly found in color TVs or displays, the triode controls the on/off of the center relay, so as to achieve the effect of controlling the degaussing coil on and off.
6. Conversion voltage: The voltage in the control line of the industrial control line is DC24V, and the coil voltage of the solenoid valve is AC220V.
7, eliminate the disturbance in the circuit: in the I industry control or computer control circuit, although there are all kinds of disturbance suppression methods, but the disturbance phenomenon still exists more or less, in the internal addition of a central relay, can reach the intention of eliminating the disturbance.
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