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 ...
Get Electric Motor Maintenance and Troubleshooting, 2nd Edition, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
