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Turning round 3-phase induction motors (forward / reverse) - 3-phase induction motor is the motor of the most popular or the most widely used in the propulsion machinery in the industrySuch as driving on the pumps,conveyors, compressorsblowers, and othersIt was probably due to the induction motor has several advantages not shared by the motors of other typessuch askontruksinya simpledurableeasy to maintainand have ahigh efficiency. However, this article does not address the overall induction motorThis article will only discuss a little about how to reverse the three-phase induction motor rotation

To reverse the direction of rotation of 3-phase induction motor is by reversing the polarity of one of the incoming voltage to the motortry to look at the picture below.
 Turning round 3-phase induction motors (forward / reverse)

In the picture above shows that the motor will rotate to the right (forwardif theterminal winding / winding motor receives voltage RST with R connected withUS connected to V and T connected with W. And the motor will rotate in the opposite direction (reverseif terminal winding motor receives voltage RSTwith R connected with US connected with the W and T are connected to thevoltage V. in other words RST reversed into RTSReversing the polarityothers can also, like R with S or R to T.

To change or reverse the polarity of the voltage that is typically used RSTcontrol circuit is a series of mechanical and magnetic contactorsAnd asmotorcycle safety also mounted motor protection (thermal overload). Note themain diagram drawing / power forward following reverse.
 Forward reverse power circuit. K1 ON (forward), K2 IN (reverse)

The figure shows that the motor will rotate to the right (forward), if K1 worksCurrently working contactor 1the voltage RST will go to the motorsequentiallyAnd the picture above also explains that the motor will rotate to the left (reverse), if K2 (contactor 2workK2 works when the RST incomingvoltage polarity reversed kemotor will be TSR(See picture above.and what happens is the motor will rotate to the left.

To regulate or control the two contactors are needed forward reverse control circuitAnd below is a control circuit diagram of the forward reverseConsider the following pictureand understand how it works.
 Forward reverse circuit control system

Working voltage contactor coil control circuit in the picture above is 220VAC. So that the picture above to get the power supply phase (R) and zero (N). But usually also used the contactor coil 380VAC working, so it should be given the power supply voltage line (phases). Voltage line here means R-S, R-T or S-T. This voltage depends on the actual granting of the coil can also kontaktornya because the coil working voltage of 100V, 200V and so on. In the picture above shows that the electric current will flow and activate K1 if on1 button is pressed. Although on1 released K1 will remain active, this is because there interlock of NO auxiliary contact (K1) which is mounted parallel to on1. So that the electric current flowing through the contactor coil to NO auxiliary contact (K1) is. K1 active when it means the motor rotates to the right (forward).

From the picture above also seen the NC auxiliary contact (K1) which is mounted in series with the coil K2, and vice versa NC auxiliary contact (K2) mounted series coil K1 premises. NC auxiliary contacts here serves as a safety interlock. For example, if on1 pressed and K1 active (motor rotates forward), although ON2 pressed the electric current will not flow to the coil K2, because NC (K1) has been opened. And for reverse rotation (reverse), then the OFF button must be pressed in advance, so that K1 off and ON2 button can now be pressed to activate the coil K2. So that the motor can rotate to the left (reverse). As well as to restore the motor rotation to the forward.