Table of Contents
Why does a motor have 12 wires?
They can simply be wired to accept higher or lower voltage, but the fact remains that for these motors, wye is always wye and delta is always delta. The electrician has access to both ends of all six coils, giving 12 total wire leads coming from the motor.
How are the windings of a 12 lead motor connected in high voltage configuration?
The extra windings are connected in series for the motor to operate at the higher voltage, and they are connected in parallel for the lower voltage. The higher voltage in these applications is usually 440 or 480 volts, while the low voltage is usually 208 or 220 volts.
What does P1 and P2 mean on a motor?
P1 is the total induced power to the pump system. P2 is the power coming from the motor (shaft effect). P2 is the nominal power of the motor. The difference between P1 and P2 indicates either: The efficiency of the motor (ηmot.)
What happens if you wire a motor wrong?
If two phases are connected incorrectly (L1 to M2 and L2 to M1, for example) – the motor will rotate opposite to the desired direction. If one phase has the polarity changed, then the magnetic field distribution within the motor winding becomes uneven, and the output torque will “pulse”.
Should I have continuity between motor leads?
If the reading is infinite, your motor should be fine. If you get a zero reading or any continuity reading, you have either a motor problem or a cable problem. Assuming you did not get an infinite reading, disconnect the motor from the cable and test each separately.
What is a 12 lead motor?
12 Leads. If leads are numbered 1 to 12, the motor is typically rated for two voltages and could be used with a wye-delta starter at either voltage, or a part-winding starter for low voltage only. Twelve-lead induction motors will almost always run connected delta.
Can you wire a 3 phase motor wrong?
If a 3-phase motor rotates in the wrong direction, you can swap any two leads to change to the desired direction. One way to test motor direction is to take your best guess on how to connect the leads, then run the motor and note the direction it spins. If you’re wrong, you undo two leads and swap the wires.