Contactor Circuits - LEKULE

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20 Dec 2015

Contactor Circuits

5. Contactor Circuits


5.1. Types of Excitation of the Control


Self-excitation


Advantage: no-voltage characteristic

Figure
Separate excitation

Figure
The contactor circuits are provided with permanent contact making



Control current locking

Advantage: By means of the control current locking contactor, no-voltage characteristic is attained in separately excited contactor circuits.



5.2. Possibilities of Representing Contactor Circuits


pulse contact making functional diagram


mixed representation - main circuit (single-pole); control circuit (all-pole)


control circuit - shown in the form of a circuit diagram


sequential circuit - functional diagram


Circuit diagram for the control of the sequential circuit



Sequential circuit with rotation monitors and unlocking switches



Circuit diagram for the sequential circuit with rotating monitors and unlocking switches



5.3. Reversing Contactor Circuits


control current - pulse locking


Circuit diagrams for reversing contactor circuits (pulse locking)


To be used for single drives only, circuit is not safe!

Circuit diagrams for reversing contactor circuits (pulse and holding current locking)



reversing contactor circuit - push - button locking



Circuit diagrams for reversing contactor circuits (Push-button locking)



Circuit diagrams for reversing contactor circuits (Push-button locking arranged as rapid change-over circuit; suitable for smaller motors only)



Reversing contactor circuit with star-delta starting main circuit



Circuit diagram for the control of the reversing contactor circuit with star-delta starting



5.4. Arc Extinguishing Circuits


reversing contactor - rapid changing-over



Arc extinguishing circuit for separate excitation




Circuit diagram for the control of the separately escited arc extinguishing circuit



5.5. Three-contactor Star-delta Connection


main circuit



Circuit diagram for the control of the three-contactor star-delta connection



5.6. Squirrel-cage Induction Motor


with effective resistance for starting in the stator and self-monitoring (unsymmetric circuit)




Circuit diagram for the control of the starting action with effective resistance



5.7. Sliping Rotor


with rotor contactor starter



Circuit diagram for the control of the slip-ring rotor with rotor starter



5.8. Interference Suppression


Interference suppression of a universal motor



Interference suppression of a direct-current shunt motor



Interference suppression of switch gears



Interference suppression of electric bells (A)



Interference suppression of electric bells (B)



5.9. Light-current Controlled Power Plant with Impulse Relay


Figure



Figure




Figure 

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