The intermediate relay is a relay protection component. Like the time relay, it is mainly used in relay protection and automatic control systems. Intermediate relays and time relays and some other types of relays are different. It is generally not The main contact is because the overload capability is relatively small. So it uses all the auxiliary contacts, the number is more.
Intermediate relay diagram
The role of the intermediate relay:
1. Isolation. The output signal of the control system is electrically isolated from the load terminal;
2, conversion. For example, the control system output signal is DC24V, but the load is powered by AC220V, which is reversible for input;
3. "Zoom in." The load-carrying capability of the signal output by the controller is often limited. At the mA or number A level, if there is a load that requires more current, it can only be converted by an intermediate relay.
The working principle of the intermediate relay The working principle of the intermediate relay is the same as that of the AC contactor. It consists of a fixed iron core, a moving iron core, a spring, a moving contact, a static contact, a coil, a terminal and a casing. When the coil is energized, the moving iron core moves under the action of electromagnetic force, and the moving contact is actuated to make the normally closed contact separate, and the normally open contact is closed; when the coil is powered off, the moving iron core drives the moving contact under the action of the spring. Reset.
Classification of intermediate relays Electromagnetic type intermediate relay: When the excitation coil is applied with an excitation amount equal to or greater than its action value, the armature is attracted to the magnet, and the armature presses the contact spring to make the contact open, open or switch controlled. Circuit. When the coil of the relay is de-energized or the amount of excitation is reduced below its return value, the armature and the contact piece return to their original positions.
Delay intermediate relay: The delay intermediate relay is divided into power-on delay (ie, power-on delay) and power-off delay. In actual operation, it also becomes adjustable delay action and adjustable delay return; delay intermediate relay With momentary contact, the delay range is generally 0.02-9.99S.
Static intermediate relay: static intermediate relay, integrated circuit type, as an alternative to the old DZ-200 series electromagnetic intermediate relay, its stability and speed are better than the old electromagnetic relay; now it is used for new cabinet construction and renovation projects. The installation method is divided into two forms: the front of the board and the back of the board. For the opening of the cabinet, the way of installing the board is required;
Intermediate relay diagram
The role of the intermediate relay:
1. Isolation. The output signal of the control system is electrically isolated from the load terminal;
2, conversion. For example, the control system output signal is DC24V, but the load is powered by AC220V, which is reversible for input;
3. "Zoom in." The load-carrying capability of the signal output by the controller is often limited. At the mA or number A level, if there is a load that requires more current, it can only be converted by an intermediate relay.
The working principle of the intermediate relay The working principle of the intermediate relay is the same as that of the AC contactor. It consists of a fixed iron core, a moving iron core, a spring, a moving contact, a static contact, a coil, a terminal and a casing. When the coil is energized, the moving iron core moves under the action of electromagnetic force, and the moving contact is actuated to make the normally closed contact separate, and the normally open contact is closed; when the coil is powered off, the moving iron core drives the moving contact under the action of the spring. Reset.
Classification of intermediate relays Electromagnetic type intermediate relay: When the excitation coil is applied with an excitation amount equal to or greater than its action value, the armature is attracted to the magnet, and the armature presses the contact spring to make the contact open, open or switch controlled. Circuit. When the coil of the relay is de-energized or the amount of excitation is reduced below its return value, the armature and the contact piece return to their original positions.
Delay intermediate relay: The delay intermediate relay is divided into power-on delay (ie, power-on delay) and power-off delay. In actual operation, it also becomes adjustable delay action and adjustable delay return; delay intermediate relay With momentary contact, the delay range is generally 0.02-9.99S.
Static intermediate relay: static intermediate relay, integrated circuit type, as an alternative to the old DZ-200 series electromagnetic intermediate relay, its stability and speed are better than the old electromagnetic relay; now it is used for new cabinet construction and renovation projects. The installation method is divided into two forms: the front of the board and the back of the board. For the opening of the cabinet, the way of installing the board is required;
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