I have a century pump motor, part number 8-152000-02. 2.0 hp. 3450 rpm. the motor is set on 230v and i would to change it to 115v but the wiring daigram on the cover plate is missing.
the motor is wired as:
terminals from the switch to the motor
1 white black and yellow
2 ----- -----
6 white yellow
can you help with this problem
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Re: rewiring mootor from 230v down to 115v
Not amperage draw doubles from 12 amp to 24 amp. A thirty amp circuit 10 gauge wire, will need to be wired from the breaker panel. a single 35 amp. breaker will be needed. Depending on the motor a larger circuit may be needed. Using 40 amp wire (8 guage wire) and a 40 amp circuit breaker may be required.
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The pulley on the compessor only came in one size ~ about 10 inch. The motor size pulley would depend on the speed of the motor. To get a good volume of air, the pump needs to turn about 800 to 1000 rpm(most pumps have max rpm at that range, good idea to check ). Gas engine turns at 3000 ~ 3600 rpm so use about 3" pully or determine by counting the number of turns of motor/engine to make one revolution of the pump. Electric motors will turn 3450 or 1725. Choose pulley to turn pump at desired speed below max pump rpm and capacity of the motor.
6.5 HP is equivalent to about 4.8kw. Now this would be ok if you were powering a resistive load such as a heater, possibly you could get a transformer to step up the voltage .The problem is that the motors on a compressor take a surge of current on startup (about 4 or 5 times the normal running current) so a transformer or generator would have to be oversized to compensate. If you are in the States, I thought there were two voltage supplies in houses, 110 for small appliances and 230 v for high power appliances such as cookers, washing appliances etc ? Perhaps you could have a socket wired for 230 v ? In Europe we use a blue 3 pin socket for industrial appliances, 16A rated for welders etc and 32A for larger devices.
There are quite a few variations of motor and pulley combinations. You can change the motor and pulley based on your needs, however do not over-clock the recommended rpm or the pump. Check the specifications of the pump to determine the max rpm . Usually the pulley on the motor will depend on the rpm of the motor. Check the rpm of the present motor to determing the rpm of the pump with current set-up, and compare to the motor you are considering. Motor rpm vary from around 850 to 3450 so pulley size is quite important. Good holidays
Century / Magnetek motors are used on many compressors but usually is an upgrade to have the option to easily switch from 110 to 220. Dewalt, Rol Air, Jenny, Emglo and others are considered high end compressors and come with switch for selecting voltage. One still must change the cord if selecting 220v setting. One thing in common is that 115v motors are never more than 2-3 HP because the amp draw for anything over 2hp is likely higher than 20 amps and would trip most common outlet breakers. You noted that your motor sticker lists 6.5 hp at 15 amp 220v so it could not work with 110v because it would draw over 30 amps and just not be practical. Magnetek motors are very good quality and most always state on sticker 110/220v and show wiring diagram for proper connection. Your compressor was most likely built to be stationary and be hardwired into an outlet/switchbox with heavy duty wiring or special cord to run such a high hp motor. You made a great buy however, because the motor alone lists for several hundered dollars alone. You could replace the motor with a 110v but you would loose the fast performance / recovery of that 6.5 hp motor. Like replacing a v8 engine with a 4 cyl. but expect to pull same load, not likely. Good luck with your purchase, and post again if you have other question.
I can't blame you for askig, but here's my response. 5 HP is 3750 running watts. or about 35 amps at 110 volts and it would take somewhere around 50 amps to start it provided the motor could even be wired for 110 which I don't believe it can and for that exact reason. I'm sorry, but it's just not practical.