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Wiring problem I need a wiring diagram to show me how to control a 3 phase motor 208 volts with two low voltage swithes.

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  • CESAR  QUANT
    CESAR QUANT Mar 09, 2009

    I HAVE THE SAME PROBLEM!!

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I am an electrician and can send you a drawing if you sign up for a free email account with like gmail or hot mail and give me the address I can send you a schematic.

Posted on Nov 19, 2008

  • Scott Jelt
    Scott Jelt Dec 02, 2008

    Did you need a schematic yet? I don't know how you would like me to get you a drawing. I have the drawing I just need a way to get it to you.

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Where can i obtain a wiring diagram


A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

May 04, 2015 | Heating & Cooling

1 Answer

I need to wire up a 3 phase compresser motor, 9 wires wired 480, to change to 240 volt hookup. right now it is wired 3 motor wires to each hot, no nameplate or wiring diagram.


Please verify the existing connections to determine if they fit the "High Voltage" configuration listed below. If they do (and they should), the "Low Voltage" configuration below is then correct for 240.

Jaypug

Low voltage ...

L1---1--6--7

L2---2--4--8

L3---3--5--9


High voltage ...

L1---1 4--7

L2---2 5--8

L3---3 6--9

Dec 04, 2013 | Gb Electrical 100 Amp GE Load Center

1 Answer

Wiring a dimmer switch with 208vac, single pole


208 Volt 2-wire is generally achieved by pulling two hot wires off 3-phase 120/208 Wye or 208 Delta, or Highleg to center tap off high leg delta.
http://waterheatertimer.org/How-to-wire-3-phase-electric.html
http://waterheatertimer.org/images/3-phase-timer-diagram3-T104-208-240.jpg

Since each of these three phase systems also offers 120volt for lights, and a dimmer can be used for lights, then I wonder what you are using dimmer for?

208 volts.can be controlled by turning off one hot of the two hot wires.
Install dimmer on one of the hot wires, and see what happens.
Is the dimmer rated for 208 volts?

Add a comment and say what you discover.

Jan 03, 2013 | Generac HTSN400G 400Amp HTS 3ph 120/208V...

1 Answer

I need to wire up a baldor 3 phase motor 208-230/480 15hp and dont have the wiring diagram to know what wire is what or where to hook it to?


Hi Casey, I'm an electrician and can help you with this problem.

First, a disclaimer. Without the catalog number of the motor you have, or a wiring diagram for it, no one can tell you how to wire this motor with any certainty. With that said...

Nearly all single speed 3 phase motors have 9 leads (numbered 1 thru 9) and can be wired for either "high" or "low" voltage. Most of the time, high is 480 volts and low is 208/240 volts. Given that you posted the amperage as "41-38 / 19", I am 99% confident that 41 amps is at 208 volts, 38 amps is at 240 volts and 19 amps is 480 volts. Further below is the way to wire unless the motor manufacturer or name plate indicates differently. You will need to determine the voltage of the appliance this is going to be installed into. You should be able to find this on a name plate of the appliance - but it may provide a dual voltage spec here, too. If this is the case, you will need to *carefully* measure the voltage with a meter, or find out the voltage of the electric panel that feeds the appliance.

Once you have learned the incoming voltage, you will connect the motor as such when L1, L2 and L3 are the line voltage supply wires and wires 1 thru 9 match the numbers on the nine wires from the motor.

208/240 or "Low" volts:
Motor leads 4, 5 & 6 connected together and wirenut.
Motor leads 1 & 7 to L1 and wirenut.;
Motor leads 2 & 8 to L2 and and wirenut and lastly,
Motor leads 3 & 9 to L3 and wirenut.

480 or "High" volts:
Motor lead 1 to L1 and wirenut,
Motor lead 2 to L2 and wirenut,
Motor lead 3 to L3 and wirenut,
Motor leads 4 to 7 and wirenut,
Motor leads 5 to 8 and wirenut and lastly,
Motor leads 6 to 9 and wirenut.

The motor should be operated briefly or "jogged" to determine the direction the motor turns. If the motor rotation needs to be changed, simply swap any two "L" wires (swap L1 and L2, or L1 and L3, or L2 and L3). Test once more to verify rotation and when correct close the wiring compartment and complete the installation. Swapping the L wires will likely be much quicker and easier to do at the magnetic contactor instead of the the motor's wiring compartment. Either location is acceptable.

You should try to obtain the name plate data for this motor - if at all possible to to make sure of the voltage and wiring method. I hope this helps & good luck!

May 13, 2012 | Gb Electrical 100 Amp GE Load Center

1 Answer

Dayton heater mod 2yu59 is not heating up?


Need to check the low voltage circuit for 24 volts, the 480 volt to 24 volt transformer may have a circuit protection reset or fuse installed. All the 3 phase electric heaters use a low voltage control circuit for operation of relays (24 volt coils).

Nov 22, 2011 | Dayton 2YU59 Electric Heater

1 Answer

I am looking at a 480v fed chiller. It seems to be wired so they can also drive a 120v pump from the same 480v feed. Is this possible?


From what I found, 480 volt, 3-phase is 480 volts from leg to leg.
It is also 277 volts from each leg to neutral.
One can use a step down transformer to reduce the 480, 3-phase to 208 v, 3-phase and then each leg of the transformed voltage would be 120 volts to neutral. Try to locate the transformer in or near the chiller control cabinet.

Dec 23, 2010 | Mr Steam TRANSFORMER 1/4 KVA 480V/120V

1 Answer

I am working with a Dayton 2YU39. The name plates states that it has to be powered by 208 volt system. There's a 3-phase panel and a single-phase panel. The 3-pahse panel L1 to ground is 118 volts. L2 is a...


Hi,
Here's what I think but you will have to check it out...
The fan motor in the 39 heater is a 120V fan there fore it cannot be hooked to the 240 which potentially could have the high (wild) leg as one of the fan legs...
The 240V 36 unit probably has a 240v fan motor....
Now if you were to make sure that the leg that fed the motor was a 120V to ground leg then you will be okay...
Hope you understand where I was going with this...

heatman101

Oct 27, 2010 | Dayton 2YU44 Electric Heater

2 Answers

I need a wiring diagram for the Hobart H600 which has a multi tap motor on and i would like to change the voltage on the motor to 200volt single phase 120/208 or even 120208 3phase. The wiring diagram is...


You cannot wire a three phase motor for single phase and you cannot wire a single phase motor for three phase. If you have a three phase dual voltage motor your options are 220 or 440 volts. If you have a single phase dual voltage motor your options are 120 or 240 volts. A 208 volt Hobart motor will only function correctly on 208 volts and is not dual voltage.

Aug 05, 2010 | Hobart H600 Stand Mixer

2 Answers

How to connect the 3 phase power supply to a 3 phase synchronous motor with control panel


I assume you have 3 phase power where this is going? The panel has 3 legs, 2 are 110 volt and one is 208 volt, you will need a tester to find out which is which if it is not marked, the motor should have a map on it for the wires to attach to, they go the same way, two, 110 and one, 208, I hope this helps, There will be one wire for a ground or a solid wire separate from the unit.

Feb 13, 2010 | AO Smith Three Phase Swimming Pool Pump...

1 Answer

I have a dayton 1 1/2 h.p electric motor, and need the wiring diagram for 460 volt. the part number is [1] 3n013bb. thanks


Line is L1 L2 L3 to line voltage. wire nut 4-7 together wirenut 5-7 together and wirenut 6-9 together connect 123 to line for low voltage 123 together 456 together 679 together. This works on all dual voltage 3 phase motors. Some of the newer Daytom motors have a plug that you just turn for changing voltage. Rudty

Jun 03, 2009 | Heating & Cooling

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