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Electric Motor Maintenance and Troubleshooting, 2nd Edition, 2nd Edition by Augie Hand

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Chapter 6

Troubleshooting Three-Phase Motors

The Dual-Voltage Nine-Lead Motor’s Internal Connections

Costly mistakes can be avoided if the technician understands the two types of connections used in the nine-lead motor. Testing can be done accurately and with confidence if the connections are fully understood.

The dual-voltage nine-lead three-phase motor is internally connected wye or delta. Data found between lead numbers are very different in the two connections. Some winding failures in a wye-connected motor will have a different look from those in a delta-connected motor—even when both have the same basic problem. Test results will also be different.

It’s important to identify the cause of burned windings. They will have a different appearance ...

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