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How to reverse rotation on type k4120 3 phase motor?

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Hello

make note of positions of wires and colors before moving and wires so can be put back if need to

in general 3 phase motors can be reversed by reversing only one of the phases that come in

as far as i know forward rotation sequence would be red, yellow, blue , (these are the 3 phase wires and could also have a black wire nuetral if the motor is a unbalanced load motor

but think that phase color blue is now white according to electricity regs for 3 phase motors

if the motor is a balanced load motor it may not have a black wire
.
(the function of the nuetral conductor is to to carry the out of balance current if the loads on each of the 3 phases is diffenent ) and of course has a earth wire as well ( which is yellow/ green )

you should reverse either red and yellow position only or yellow and white position only

but if in doubt check with your local electrcian to confirm
always check electrcity regs before altering

cheers






Posted on May 29, 2011

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How to Reverse the Rotation of Single Phase Capacitor-Start Electric Motors


Reversing the rotation of electric motors can be done easily with 3-phase motors. This can be easily achieved by swapping the connection of any two motor leads. But 3-phase motors are usually found and used for industrial purposes. The ones found and used in our homes, from water pumps to electric fans, are single phase capacitor-start type motors. Unlike 3-phase motors, reversing the rotation of single phase electric motors is no easy task. Swapping any two motor leads will not result in the reversal of the motor rotation. Analysis of the motor windings and connections are necessary before any modification can be done to achieve the desired result. Let's take a 3-speed single phase capacitor-start electric motor with electrical diagram shown below as an example. Make sure the motor is disconnected from the power supply before attempting to follow this tip. This tip is intended only for individuals with electrical knowledge, necessary tools, and understand the risks associated with handling electrical equipments and devices.

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The first step in the process is determining the start winding which is connected to the line (AC white) and to one side of the start capacitor. To accurately determine the start winding, disconnect all motor leads from the start capacitor and the speed switch for multi-speed motors and then setting your ohmmeter to the lowest scale (R x 1), measure the resistances between the AC white line and each of the motor leads connecting to the start capacitor. The one with the least resistance is the starting winding lead.

Once the start winding lead going to the capacitor is determined, reconnect the capacitor then connect the black AC line to the found start winding lead (marked X). Connect the white AC line to L of speed switch, the motor lead formerly connected to AC white to 3, red to 2, and white to 1 as shown below. Leave the green/yellow ground wire connection as is.

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Below are the wiring modifications for 2-speed and single speed single phase capacitor-start electric motors.

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