gjrepesh
Cast Iron
- Joined
- Aug 30, 2002
- Location
- Royse City, TX
What do I do with a straight 200 Volt, 3 phase motor? Where are they used? I couldn't get it to run.
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What do I do with a straight 200 Volt, 3 phase motor? Where are they used? I couldn't get it to run.
Don't plan to use it but wanted to know something about it. Thanks.
The Hz only affects the speed. If a 50 HZ motor is run maxed out on 60 Hz it might have a cooling problem but very few machine tool motors run maxed out for any length of time.It is more likely that a 60 Hz motor on 50 Hz would have a cooling problem since it's fan is 20% slower. For all practical purposes it just means that a 50Hz motor will run 20% faster on 60 Hz.
Out of curiosity....did you ohmmeter it? I looked over the thread and didn't see that.
You should get same resistance between any pairs of the 3 input wires. if not, you can look to see if it has any easy reason, like a thermal protector that went bad. It's common to have a thermal on motors up to 1 HP (in lieu of a "motor controller with protection"), and they often connect the 3 wires at the wye point, because it's easy.
There are two "Classes" of voltages un the US: Distribution Voltage and Utilization Voltage. Distribution is what the utilities deliver: 480, 240, 208 etc. utilization is what the equipment, i.e. motor, manufacturers design to, which allows for a certain amount of expected voltage drop between the distribution connection and the motor termination. The Utilization Voltage is always lower. So for 480V, it is 460V, for 240V it is 230V, and for 208V it is 200V. That's what you have.
Because of the volume of 208V 3 phase distribution systems in commercial installations, many motor mfrs sell a motor rated for anywhere from 200-240V. It's really a compromise, but they don't say that. you would get better motor life on a 208V system using a motor nameplated at 200V.
PS, as others have said, there is nothing about the voltage rating that would make it not work on a 240V 3 phase system (although it would run hot and not last long). So if it failed to start, it was something else.
So if I have 3ph 230v power, I can run a Japanese 3ph 200v with no issues?
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