How to safely change motor rotation for 3 phase and DC motors.

Step 1: MATERIALS

LOCK OUT KIT

METER

MOTOR

Step 2: LOCKING OUT MOTOR

The first and most important step in changing motor rotation is to lock out the motor. This is done by disconnecting the motor at the nearest power source and locking that connection open. It is important to write all information on the lockout tag and include it with the lock on the disconnect. The key to the lock should not be In any hands other than yours.

Step 3: OPEN COVER AND VERIFY NO POWER

Next open the cover on the motor to access the motor leads. Verify motor is locked out by checking for voltage with a meter. Check between all power wires and between power wires and ground. If no voltage is present proceed with the next step.

Step 4: DETERMINE MOTOR TYPE

Then, determine if the motor is 3 phase or DC. The nameplate on the motor will state what it is. If the nameplate is to worn to read or missing, count the number of wires. An AC motor will have three phases so there will be three power wires. DC motors only have a positive and negative power wire.

Step 5: RE-WIRE

If the motor is 3 phase determine the power wires. These should be labeled T1, T2, and T3. Any other wires are for changing motor voltage and should not be touched. Swap any two of the power wires and the motor will change rotation. Again, be sure not to swap any wires other than these.

Step 6: RETURN POWER TO MOTOR

After switching the wires replace the cover and return power the the motor. It is important to have someone stand by the motor and verify it is turning the correct way as the disconnect is turned back on.