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How can you find motor FLA without the motor nameplate The motor is single phase 120 vac?
Wiki User
∙ 13y ago
use clamp on amp meter
jim brooks
Wiki User
∙ 13y agoSee related links below.
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What is the difference between a one phase and a three phase motor. And if a three phase motor is given a single phase supply will it run or not?
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
Can you wire a 3 phase 690 volt delta star motor to 480 volt 3 phase with out harming the motor?
Depends on the motor and the load on that motor. If the motor is loaded to its capacity, it will draw the same amount of power as it would on 690 volts - which will result in ( 690/480 = ) 144% of normal current, which will thermally damage the motor, or will trip overload protection.
Drawing block diagram of single phase capacitor start motor?
Drawing block diagram of single phase capasitor start motor?
Do all single phase motors have a start and run winding?
No, commutator motors as used in vaccum cleaners for example do not use a starting winding. Single-phase induction motors need a starting winding without which they will start in either direction if given an initial twist.
How many current sensing devices are required by the National Electrical Code to protect a single-phase motor operated on 240 volts?
For a single phase fractional horsepower motor, only one over current device is needed in the motor feeder. This protection can come in the form of a switch which has the overload heater incorporated into it. These switches come in single and double pole configurations. Select the heater for the motors full load current that is taken from the motors nameplate. Search the web for "fractional motor starter switch".
How do you determine a 3 phase motor and each winding?
To see if the motor is three phase or single phase look at the motor's nameplate. There it will tell you what the voltage needs to be and what system phase the motor needs to be connected to operate properly.
What will happen if two phase supply given to the single phase motor?
Two phase is single phase for today's purposes. We generally do not call 240v single phase "two phase" anymore, although technically that's what it is. 240v two phase has power to both lines to the motor versus 120v single phase has one power line and a neutral. Fortunately most single phase motors today are dual voltage. So check your nameplate data of the motor for guidance. The use of proper motor protection will prevent any damage to motors if wrong voltages are inadvertantly applied.CommentA two-phase system is an archic system, in which two phase voltages are displaced from each other by 90 electrical degrees. Like three-phase, it had the advantage of producing a naturally-rotating magnetic field, so could drive induction motors without any need for a starting capacitor.
How do you check single phase motor winding?
Single phase motor winding is often checked just by listening to the noise that the motor is making. An experienced person can tell if the motor is working at single phase or double phase.
What are the advantages of three phase motor over the single phase motor?
A 3-phase motor produces a steady torque that does not pulsate. A 3-phase motor starts turning in the right direction when switched on without the need for a separate starting winding.
Can a 240 volt single phase motor be supplied with one phase until the other phase is closed without harming the motor?
Not a good idea. Use a double pole single throw switch to start and stop the motor if motor HP is small. Use a motor contactor on larger HP motors.
Is 3 phase motor run on 1 phase supply?
No. That would be a single phase motor.
What is the difference between a one phase and a three phase motor. And if a three phase motor is given a single phase supply will it run or not?
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
How do you convert a 0.37kw 4 pole 3 phase motor to single phase?
The motor cannot be altered to work on single phase power. You will either have to put in a new single phase motor or use a phase convertor box. Do a google search for phase convertor - you will find plenty.
How do you calculate the no-load current of a three phase induction motor?
All transformers, single phase or three phase have a "no-load current" rating. That is simply the nameplate rating of the Xformer in VA, (volt-amps) or KVA (1000Volt-amps) for larger Xformers. Simply divide the nameplate rating in VA or KVA by the supply voltage and you'll get the Xformers potential maximum output in ampheres.
Can you wire a 3 phase 690 volt delta star motor to 480 volt 3 phase with out harming the motor?
Depends on the motor and the load on that motor. If the motor is loaded to its capacity, it will draw the same amount of power as it would on 690 volts - which will result in ( 690/480 = ) 144% of normal current, which will thermally damage the motor, or will trip overload protection.
Where can you get a free wiring diagram for a 480 volt reversible motor?
If the motor is 3-phase (it will say so on the nameplate), you don't need a diagram. just hook up all 3 wires in any order. If the motor runs the wrong direction, swap any two of the phases. This is true for all 3-phase motors. Its that simple! Warning: this obviously will only work if you have 480v, 3-phase power available. If you are trying to do this at home, it almost certainly won't work, because homes (in the US) typically have 240v 1-phase power. Trying to run a 3-phase motor directly on single phase power will destroy it. There are various ways to convert single phase power to three phase, but if you are having a hard time just hooking up the motor, they are beyond your ability at this time. Get a qualified electrician to help you! It could save your motor, and quite possibly your life!
You have one hp three phase motor where as available power supply is only single phase how can you run this motor?
You will need to install a phase converter or change the motor to single phase. You can find a licensed electrician at www.contraxtor.com
