# How do you identify motor leads?

Contents

## How do I identify the six unmarked leads of an induction motor?

Re: How To Identify Unmarked 6-Lead Three-Phase Motor Leads

use a 6 volt battery and a center zero galvanometer, connect the galvo to one pair and noting which ends are connected to the + and – of the meter, mark the winding ends as you have connected them to the meter.

## How do you determine the polarity of a motor winding?

Procedure to identify terminals A1, A2 and B1, B2

1. Randomly pick one of the phase winding terminals, say A1 and A2.
2. Attach the positive terminal of the battery to A1 and the negative terminal to A2 through a switch.
3. The meter is attached across one of the other two-phase windings, say B phase randomly.

## What is the number identification of the terminal of a coil?

In the case of a conventional cylinder ignition coil, the electrical connections are designated as terminal 15 (voltage supply), terminal 1 (contact breaker), and terminal 4 (high-voltage connection).

## How do I know if my AC is induction motor?

AC Motor Winding Resistance Test

Check the motor winding resistance or ohms reading using a multimeter or ohmmeter for phase to phase terminal ( U to V,V to W ,W to U ). The ohms reading for each winding must be the same (or nearly the same). Remember that the three phases have identical windings or nearly so!

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## How do I know if I have three phase windings?

A procedure has been adopted by the IEC for identifying three phase winding connections. Letters and numbers are used as follows. The high voltage (HV) terminals have upper-case letters e.g. A-B-C, R-Y-B, U-V-W, L1-L2-L3 and the low voltage (LV) terminals have lower-case letters e.g. a-b-c, r-y-b, u-v-w, l1-l2-l3.

## How can you tell if a motor is delta or star?

In STAR Connection, the starting or finishing ends (similar ends) of three coils are connected together to form the neutral point. A common wire is taken out from the neutral point which is called Neutral. In DELTA Connection, the opposite ends of three coils are connected together.

## How do you know if a motor is Delta or Wye?

If leads are numbered 1-6, the winding can usually be connected wye or delta. On machines rated for two voltages, the wye connection is for the high voltage; the delta connection is for the low voltage.

## How many leads does a motor have?

Each motor will have 9 numbered leads coming out of the motor. The leads are numbered to aid the electrician when connecting the motor. If you look at the manufacturer’s name- plate it will have a table similar to Table 1 that describes how the leads should be connected.

## 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.

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