B Sutherland
Plastic
- Joined
- Jan 26, 2006
- Location
- Ontario, Canada
I have a 3 phase motor on a lathe that i've acquired and I'm wiring in a new motor control circuit as it is missing.
It's a open frame, two speed motor (1760/1140), 3hp at both speeds made by British Thomson Houston. It's two separate windings with the leads marked Ha,Hb,Hc and La,Lb,Lc. Before I hooked it up I used a continuity tester to make sure I had the right leads grouped together when wiring at the relay panel as the leads weren't marked at the panel.
When I applied the tester to the low speed leads continuity was indicated by a steady tone and had a reading of 7 ohms between leads. I decided to rotate the shaft and the tone on my tester was beeping and the resistance on my meter was changing.
When I tried the high speed leads the tone was steady and the ohm reading was 7 ohms. When I rotated the shaft during this test the tone stayed steady and the resistance stayed the same.
I've put new bearings in the motor as the old ones weren't in great shape. The motor has been vacuumed out and blown out and there is nothing obvious to me to as what is causing this. Any other tests that I should do before it's taken to a motor shop?
It's a open frame, two speed motor (1760/1140), 3hp at both speeds made by British Thomson Houston. It's two separate windings with the leads marked Ha,Hb,Hc and La,Lb,Lc. Before I hooked it up I used a continuity tester to make sure I had the right leads grouped together when wiring at the relay panel as the leads weren't marked at the panel.
When I applied the tester to the low speed leads continuity was indicated by a steady tone and had a reading of 7 ohms between leads. I decided to rotate the shaft and the tone on my tester was beeping and the resistance on my meter was changing.
When I tried the high speed leads the tone was steady and the ohm reading was 7 ohms. When I rotated the shaft during this test the tone stayed steady and the resistance stayed the same.
I've put new bearings in the motor as the old ones weren't in great shape. The motor has been vacuumed out and blown out and there is nothing obvious to me to as what is causing this. Any other tests that I should do before it's taken to a motor shop?