COMBINATION OF DIRECT ONLINE AND JOGGING CIRCUIT

COMBINATION OF DIRECT ONLINE AND JOGGING CIRCUIT

In some industrial applications we need to use both direct online and jogging circuit. It won’t be economical to use the other circuit and then when we need to use another we disconnect the former circuit to connect another, this can be time consuming especially in a busy industry.

Now that’s when the need for combination of both the jogging and direct online circuits arrives.

NOTE THAT WE ASSUME THAT YOU ALREADY KNOW OPERATIONS OF MOTOR CONTROL COMPONENTS IF NOT THEN WAIT FOR OUR SECTION ON MOTOR COMPONENTS DESCRIPTION

 

COMPONENTS

F1-Thermal Overload Relay,      

KM1-Contactor

3phase Induction Motor

S1-Stop push button (NC)

S2-Start push button (NO)

S3-Double acting switch

CB1-3phase circuit breaker

CB2-Single phase circuit breaker

OPERATION

Combination of direct online and jogging can be made by using a double acting push button S3. The normally closed section of the JOG push button is connected in SERIES with the holding contact of KM1 in such a way that when the button is pushed it will deactivate the holding contact from receiving power and prevent it from sealing the circuit. The normally open section of the double acting button completes a circuit to energize the coil of the motor starter. When the button is released, the normally open section breaks the circuits to M coil before the normally closed section get back to its position in the circuit. The double acting switch act as a jogging switch when ever jogging is required, whenever we need the motor to run by itself we press S2 then the motor will run on the direct online mode.

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