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I have a compressor electric motor 3ph I want change to1ph

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You cannot change a motor from 3phase to single phase. You could buy a roto phase, which is a generator that makes 3 phase. You could buy a single phase inverter that creates 3 phase. It would be cheaper to buy a single phase motor.

Posted on Aug 01, 2010

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Posted on Jan 02, 2017

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I have old carrier 50zp060511s Air Conditioners that having voltage details like 3ph 220V 60hz UL Standard But now i have voltage of 400V 3ph & 230V 1ph.. is there any solution for this issue..


If you are reading 400 volts coming into the unit, call electric company. You should only have 220-240 from your power lines. Anything over that will burn out unit. P.S. In my opinion Carrier Units are the best and longest lasting when properly maintained.

May 08, 2016 | Carrier Heating & Cooling

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What size generator do I need to run a 10 hp motor


on the plate attached to the motor you will find several important items
one is the wattage of the motor
this is the maximum wattage that the motor uses when under load
the gen set will need to be at least 30% bigger than that figure
next there will the number of phases that the motor is
it will read as 1 ph or 3ph
If it is 1ph that is a single phase motor and will ru from a single phase gen set
however if it is 3ph you will need a 3ph gen set to run the motor
As most single phase motors are limited to around 5hp I would be very sure that the motor is not 3ph
specialist advice from an accredited electrician or electrical motor shop is recommended before buying a gen set. as if you need 3ph the gen sets become expensive.

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1 Answer

Change cebora prof 55 plasma cutter from 3ph 4oov to 1ph 230v


Sorry but you can't change a prof 55 3ph to monophase. The 3ph transformer is simetric, but the 1ph prof 55 transformer isn't.
You should change transformer and add a bank of capacitors to compensate the lack of power.

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What is the variable frequency drive?


VFD is a device used for speed control of 3ph induction motors & automation process control

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1 Answer

My type 30 slows down when the tank pressure reaches close to 100 psi.. motor is new as this caused old one to burn up,, what can it be?


1. Are you sure the motor is wired for the correct voltage? If you have 230V 3PH,Make sure that you do have 3 hot legs. you should have L1-1+7, L2-2+8, L3-3+9 and 4+5+6 connected together. If it is wired for 480V it will not have enough torque. Check rotation. There should be an arrow on pully (large one on compressor)

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1 Answer

Air compessor wont start under load it is a airking 3 hp 3ph compessor and will not start under load.


was it running before? what ahpened to it? Is it on 3 phase service or a converter? Does it run with no air in it? Is there a trip for 2 or 3 circuits or just one? I would suspect th epower supply first, and then check the motor to see if it is ok. If it is a converter, they are only good for x amount or hours. Check it out.

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1 Answer

Bought A new daton fan motor to replace the old one and it spins backwards now


You didn't give any model numbers so there is little to go on, but typically a motor spinning backwards has been wired incorrectly, particularly if it is a 3ph motor. There could be other causes but in 3ph motors this is the most common.
Good luck!

May 18, 2010 | Heating & Cooling

1 Answer

How do i connect he differenial pressure switch into the 3ph star/delta starter circuit?


Your question is a bit unclear, but I assume you are asking how to wire the pressure switch in a piston compressor.

See the diagram, below.

You should have a wire from the L1 (first incoming main voltage) terminal to the pressure switch, and from the other pressure switch terminal back to the starter coil. You will also have a wire from L2 (second main voltage terminal) to the overload, and from the other overload terminal to the other side of the coil. In this arrangement, the motor starter coil must be rated at the SAME VOLTAGE as your incoming power.

This diagram works the same for single phase machines (they just don't have the third wire coming from the supply through the starter and overload to the motor.

If your machine has other safety controls (like a low oil switch), It can be wired in series with either the pressure switch or the overload.
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1 Answer

How do i connect the differential switch into the 3ph star/delta starter circuit?


Your question is a bit unclear, but I assume you are asking how to wire the pressure switch in a piston compressor.

See the diagram, below.

You should have a wire from the L1 (first incoming main voltage) terminal to the pressure switch, and from the other pressure switch terminal back to the starter coil. You will also have a wire from L2 (second main voltage terminal) to the overload, and from the other overload terminal to the other side of the coil. In this arrangement, the motor starter coil must be rated at the SAME VOLTAGE as your incoming power.

This diagram works the same for single phase machines (they just don't have the third wire coming from the supply through the starter and overload to the motor.

If your machine has other safety controls (like a low oil switch), It can be wired in series with either the pressure switch or the overload.


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2 Answers

Wire up a 3 phase motor to single phase 240v power


3ph motors will only run on 3ph power, trying to single phase will only burn up windings,

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