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208v

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genedog

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i have a saw that is 3 phase 220v at my new job. i have always worked with 240 480 3 phase but my new work has 208 3 phase, all i can get on my meter is 190v on so the saw is running hot, need info please
 
genedog said:
i have a saw that is 3 phase 220v at my new job. i have always worked with 240 480 3 phase but my new work has 208 3 phase, all i can get on my meter is 190v on so the saw is running hot, need info please
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Where are you getting a saw that is rated at 220 Volts? In the U.S., the saw would be rated at 230 V. I've used 220V three phase in Brazil (127 line to neutral), but i've never seen it here. :-?
 
eric stromberg said:
Where are you getting a saw that is rated at 220 Volts?
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I wired up an old offset printing press that was rated at straight 220 on the antique open cage type Westinghouse motor data plates.
 
mdshunk said:
I wired up an old offset printing press that was rated at straight 220 on the antique open cage type Westinghouse motor data plates.
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To what did you connect it? Did you use a buck transformer?

In the same manner, i suppose a boost transformer could be configured to get 220V from 208V. Not a standard voltage, but if the transformer had taps...
 
eric stromberg said:
To what did you connect it? Did you use a buck transformer?
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The place had a delta service with enough VD in the panel nearest the press that it was close enough to 220 for me. Maybe 224. I forget. Wasn't worth fussing about. I'd have used a buck-boost for sure if this voltage drop special circumstance hadn't presented itself to my advantage. I've seen 208 services closer to 217-218, which would have suited me also. That wasn't the case in this event, however.

Consequently, a buck transformer and a boost transformer is usually the same transformer.
 
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mdshunk said:
Consequently, a buck transformer and a boost transformer is usually the same transformer.
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Correct, it's just a connection difference. I was just using the applicable word instead of saying something like "...buck/boost transformer in buck mode..."
 
It's important to remember that buck-boost transformers, as well as auto-transformers, used in boost mode are not a panacea. The energy has to come from somewhere.

Voltage and current ratios come into play just as with standard transformers. If voltage drop is a problem now, boosting at the load will increase the voltage drop.

For boosting, it would be better to place the transformer as close to the supply end of the run as you can. This provides for higher circuit voltage and less voltage drop.
 
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