230v motor
- Thread starter kencoel
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robbietan
Senior Member
- Location
- Antipolo City
where did you get the 230V motor? that is our standard here in the philippines. seriously, if we use the plus/minus 10% voltage thing, the motor should run at 208V. anything lower than 207V will make the motor run hot and probably shorten its life.
Motor Starting
Motor Starting
I believe the reason is there are 200V rated motors and 230/240V motors in theory yes a 230 volt motor will run off of 208V but the problem this is in a perfect environment, realiastillacy the utility is typically allowed 5% voltage drop at their service (depending on your utility) and the customer typically 5% thought their facility (if complying with ASHRE 90.1 I believe it states 5% total voltage drop 2% on feeders and 3% on branches) so this is where the problem comes in for some reason if you operate a 230V motor at 208V and you the voltage drop falls to the 10% line you only have 187.2V at the motor, this means the motor will not be able to start. The low side of a 230V motor is 207V as mentioned above, so as long as your conductors are sized for zero volt drop and the utility does not fluxuicate their voltage to the site you would be operating at the absolute bare minimum, if you were to use a 200V motor it would be able to operate at the maximum low end of the voltage drop on a 208V system where as a 230V motor could not. I guess I would just specify a motor rated at 200V for 208V application. I believe the IEEE red book has some good information about voltage considerations. Hope this helps.
Red Book Definition:
Nominal System Voltage: ?The root-mean-square phase-to-phase voltage by which the system is designated and to which certain operating characteristics of the system are related. (The nominal system voltage is near the voltage level at which the system normally operates. To allow for operating contingencies, systems generally operate at voltage levels about 5-10% below the maximum system voltage for which system components are designed.)?
Motor Starting
I believe the reason is there are 200V rated motors and 230/240V motors in theory yes a 230 volt motor will run off of 208V but the problem this is in a perfect environment, realiastillacy the utility is typically allowed 5% voltage drop at their service (depending on your utility) and the customer typically 5% thought their facility (if complying with ASHRE 90.1 I believe it states 5% total voltage drop 2% on feeders and 3% on branches) so this is where the problem comes in for some reason if you operate a 230V motor at 208V and you the voltage drop falls to the 10% line you only have 187.2V at the motor, this means the motor will not be able to start. The low side of a 230V motor is 207V as mentioned above, so as long as your conductors are sized for zero volt drop and the utility does not fluxuicate their voltage to the site you would be operating at the absolute bare minimum, if you were to use a 200V motor it would be able to operate at the maximum low end of the voltage drop on a 208V system where as a 230V motor could not. I guess I would just specify a motor rated at 200V for 208V application. I believe the IEEE red book has some good information about voltage considerations. Hope this helps.
Red Book Definition:
Nominal System Voltage: ?The root-mean-square phase-to-phase voltage by which the system is designated and to which certain operating characteristics of the system are related. (The nominal system voltage is near the voltage level at which the system normally operates. To allow for operating contingencies, systems generally operate at voltage levels about 5-10% below the maximum system voltage for which system components are designed.)?
motor
motor
you might find your result depends somewhat on the motor load. the heavier the motor is loaded to it's capacity, the more likely that you will have problems operating a 230v motor on 208.
that, and, of course the actual voltage of your system ( not unusual to find 220v on a 208 volt system)
motor
you might find your result depends somewhat on the motor load. the heavier the motor is loaded to it's capacity, the more likely that you will have problems operating a 230v motor on 208.
that, and, of course the actual voltage of your system ( not unusual to find 220v on a 208 volt system)
Sure. It just won't put up the rated torque.kencoel said:
Because that is the voltage it was wound for. A different voltage rating would have a different number of turns and a different size wire.kencoel said:
carl
edit: This is based on assuming you started with a 230V single phase motor.
This site has just shed some light on a problem I had 15 or so years ago. It was a 1HP 208/240 volt single phase motor on a sprinkler compressor. It was running on a 208 volt feed. I would get to the site to investigate it tripping and start the motor and run it successfully several times. The amperage and overloads all seemed to be OK. No looseness and no overheating any time I was there. After several service calls (I was a lot younger and less experienced then) for the same problem the owner asked for the motor to be changed to a 208 volt rated motor. No more trouble. Now after reading here I wonder if the utility voltage had dipped at certain times and if the motor tried to start at those times it tripped?
""""Thanks""""
""""Thanks""""
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