DanThomas
Electrical
- Jan 15, 2004
- 3
We just had a 50HP compressor motor burn up. It has a star / delta starter. One of the delta contacts failed, causing that part of the winding to single phase. The overload relay never tripped. Motor FLA is 60 Amps. Overloads rated at 63 Amps. Overload relay is connected to T1, T2, and T3. The contact that failed was one that goes to T10, T11, and T12. Should there be another overload relay for leads T10, T11, and T12? The existing overload relay may work for an overload condition, but it certainly provided NO protection when one of the contacts failed. Any recommendations would be appreciated. Thank you.