CN203054487U - Motor protector expansion system implemented with logic controller - Google Patents

Abstract

The utility model discloses a motor protector expansion system implemented with a logic controller. The motor protector expansion system is characterized in that the logic controller is connected with a control signal source, and is connected with the motor protector through a lead; a power supply is connected with the motor via an alternating current contactor through the lead so as to control the on or off of the alternating current contactor and further control rotation or stop of the motor. In comparison with the prior art, the motor protector expansion system has the advantages that, the logic controller is a smart relay suitable for small automation control, can replace the elements, such as an intermediate relay and a time relay, has the advantages of being flexible to use, reducing wiring and saving installation space, and also can be expanded; and the motor protector works steadily and has comprehensive protection function.

Description

Realize the motor protector expanding system with logic controller

Technical field

The present invention relates to realize the motor protector expanding system with logic controller.

Background technology

At present; the expanding system of motor protector all is to use relay to realize, but uses this scheme trouble spot more, stable and reliable inadequately, and dirigibility is not enough; if control principle has change slightly, then the expanding system of relay will rewiring even increase relay.

The present invention tries hard to use the expanding system of logic controller, even control principle has change, only needs to change software program and gets final product, and need not change wiring and increase components and parts, and is very convenient.

Summary of the invention

The objective of the invention is to solve the problem that prior art exists, provide a kind of and realize the motor protector expanding system with logic controller.Remedy less this deficiency of the chain scheme of motor protector, increase the dirigibility of its control, safety, reliable and stable.

Technical scheme of the present invention: a kind of with logic controller realization motor protector expanding system; it is characterized in that: logic controller links to each other with the control signal source; and link to each other with motor protector by lead; power supply links to each other with motor with lead by A.C. contactor; with control being switched on or switched off of A.C. contactor, thus the rotation of control motor or stop.

The present invention compared with prior art has the following advantages: logic controller is a kind of intelligent relay that is applicable to small automatic control; it can replace elements such as auxiliary reclay, the time relay; has flexible, minimizing wiring easy to use; save the advantage of installing space; can also carry out infinite expanding, the protection of motor protector working stability is complete.

Description of drawings

Fig. 1 is the structural representation of invention.

Fig. 2 is programmed logic figure.

Among the figure, 1-logic controller, 2-motor protector, 3-A.C. contactor, 4-control signal source, 5-power supply, 6-motor.

Embodiment

See Fig. 1; the present invention is a kind of to realize the motor protector expanding system with logic controller; it is characterized in that:logic controller 1 links to each other with control signal source 4; and link to each other withmotor protector 2 by lead; power supply 5 links to each other with motor 6 with lead by A.C. contactor 3; with control being switched on or switched off of A.C. contactor 3, thus the rotation of control motor 6 or stop.

Referring to Fig. 2, logic controller of the present invention gets electric initialization, the external signal that collects is at first carried out discriminatory analysis, thenmotor protector 2 is given an order, if this moment,motor protector 2 protect action, thenmotor protector 2 assigns this order to A.C. contactor 3 and to the signal oflogic controller 1 transmission oneself state; If this moment, motor protector had the protection action, then motor protector will not assigned this order to A.C. contactor, but still transmit the signal of oneself state to logic controller.

Claims (1)

1. realize the motor protector expanding system with logic controller for one kind; it is characterized in that: logic controller links to each other with the control signal source; and link to each other with motor protector by lead; power supply links to each other with motor with lead by A.C. contactor; motor protector links to each other by lead control A.C. contactor; with control being switched on or switched off of A.C. contactor, thus the rotation of control motor or stop.

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