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    June 9, 2014
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    June 9, 2014
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Can a 230 volt motor be converted to run on 208 volts?

Check the nameplate; if it shows a '208/230Vac rating, it should also show the FLA-current for both voltages-the 208Vac figure should be about 20% higher.

If your nameplate only shows 230Vac, it will still run on a 208Vac network, but the higher current will overheat the motor and substantially reduce its service life.
4 months, 3 weeks ago
by
oldmarine12
 

do we need a starter for a 3ph 50hp 460volt motor hook temporary to a diesel generator on a pump-jack if so what size

At 50Hp 3/460Vac, you need a NEMA size 3 starter; temporary or not.
4 months, 3 weeks ago
by
oldmarine12
 

Is there a big difference between gear motor ratios of 361.1 and 362.1 that will make a difference in the feed rate of my haman coal stoker.

old model # 3-20-6z075 new is just 6z075.Every thing else is the same . Thank you
I don't know how you were able to get the replacement gear ratio that close, but that's almost perfect and you're good to go.
4 months, 3 weeks ago
by
oldmarine12
 

i want a electric motor that has 500 hp

No problem; all you need is the base speed, enclosure and frame size.

It would also help the people selling the motor to know if you want Three Phase induction, Wound Rotor or a DC motor, and just what you're planning to use it for, and if it's to be belted duty or direct-coupled to the load.
4 months, 3 weeks ago
by
oldmarine12
 

If a 208-230 volt motor is run on 208 volts, is there any reduction in starting torque? If so, how much?

Check your nameplate; if the motor carries the 208Volt rating, the starting & breakdown torque is the SAME as for the 230Volt connection.

The difference is your starting and running CURRENT; it will be approximately 20% higher at the 208Volt connection, so you may have to change or adjust your overload protection.
4 months, 3 weeks ago
by
oldmarine12
 

is there any harm to a motor if I use a 10uf 370v capacitor instead of a 5uf 370v

No, the 'microfarad' rating 10uf is it's capacity; the voltage rating is what's critical here, and it's the same according to what you have written.

A good analogy is using a 10Hp motor in place of a 5Hp #with everything else the same.
The LOAD on the motor is/was only 5Hp, so that is all the power & torque the 10HP is being asked to produce.
The larger motor will not be as 'energy efficient' as the smaller, properly-sized motor, but the 10Hp will not 'over-power' the 5Hp load.
4 months, 3 weeks ago
by
oldmarine12
 

do you have a single phase AC motor - explosion proof case, 2 hp - 1800 rpm?

i want to couple that motor with a foam pump.
Field of Industry:: fire truck
You need to know what the FRAME is for this motor; it should be on the nameplate (e.g. 56C, 145TC, etc.) if it's a domestic/US make. If it's a metric frame, it will be something like 112M, 132S, etc.

The best way to try & match this up electrically, mechanically and physically from a local supplier like WW Grainger is to bring the motor in so their applications specialists can check the motor & nameplate.

If the motor is what's called an OEM (Original Equipment Manufacture), you may be stuck calling whoever built the foam pump.
4 months, 3 weeks ago
by
oldmarine12
 

how to determine the rotation of a motor

If you're doing a new installation, "Bump Test" the connected (not coupled# motor & see which way it rotates. You can reverse the direction of rotation by reconnecting some of the leads #on a single-phase motor; check the wiring diagram#, or changing just two leads #phase connections) on a three-phase motor.

If you're trying to describe if a motor rotates CW or CCW, look at the end of the motor shaft dead-on, and use that as your reference for CW or CCW rotation.
4 months, 3 weeks ago
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oldmarine12