Connect the ground wire from the switch to the ground terminal in the wiring box. Basic cheap plug-in breakers are “slash” rated, meaning 240/120V; they are rated 240V phase to phase, but 120V phase to ground. Phase B, the “high” leg, is not. As shown in the fig below, connect a a single pole circuit breaker to any hot busbars i. Figure 1. Essential Components of a 240 Volt Single Phase Motor Wiring Diagram Before wiring your 240 Volt single phase motor, it's important to understand the core elements of the this type of motor wiring diagram. Set the multimeter to check continuity. On a 240V 3 phase grounded delta system, the voltage to ground is 240V from 2 of the poles. The three phase power supply consists of three individual lines power supply, each with its own voltage and current capacity. First thing to say, is WOW, not much out there when talking about the basics of the 3 phase power, and how to balance the system. Solved A 3 Phase Electrical Motor Wiring Diagram With Chegg Com. Single phase uses phase voltage, 2 phase uses line voltage, split phase uses 2 lines, a neutral and usually a capacitor to simulate a third phase (it's a method of motor wiring) It is possible to use more than 3ø, it's easiest to think of phases like the piston and con rods on the crank shaft of an engine. Next, you will need to find the correct wire size for the motor per your local electrical code. What Is A Contactor Library Automationdirect Com. NEMA frame 142T – 324T. Based on that diagram and the fact that the motor will be operated at 230 V, I gather that wires 9 and 3, 8 and 2, 7 and. a) The maximum motor sizes permitted for starting across the line shall be: i) Single phase, 7. If the motor has screw posts in the wiring box, there will be an extra screw post, not connected to anything, for connecting leads 2,3,5 together. Since there is a voltage drop between the power source and the electric motor, the single phase motors are rated either 115 volt or 230 volt. Wiring a 3 phase 480 V motor may. Check DetailsMost 3-phase motors can be wired to work in either a high or a low-voltage circuit. [2] It is a type of polyphase system employing three wires (or. This video discusses a 120/240V Three-Phase Four-Wire Delta System. D/V Alpha/Beta Series D-4/6. UPDATE (31st Jan): From the information provided by pingswept and bt2 in their answers, I think I've come up with a simulation of the. 7 A Class Ceiling Fan Connection Diagram. Make sure the replacement motor may be wired for 220 volt single phase, the same as the existing air compressor circuit, paying close attention to the voltage and amperage which must be within the specs of the. Components in a Baldor 5hp Single Phase Motor Wiring Diagram. The voltage you are seeing on the high leg should be closer to 208 (120 X 1. 480v 3 phase motor wiring diagram. Check Details. Features. Probably. Here is a website that explains the operation of different types of electric motors without single-phase electric motor diagrams. Normally, it is found under the right hand aspect from the instrument panel. When dealing with an electric motor, understanding the wiring diagram is essential. A 120/240 volt single phase panel found at a home or shop can only provide up to two separate lines of power, therefore this type of electrical service could not provide the necessary power for a 3 phase motor. Dispenser. The manual indicates: The equipment is designed for 3 phase 230V power supply (Between each hot wire, 220 volts can be measured) when 2 phases are connected. 1. The 480 Volt 3 Phase Wiring Diagram For Lights will likely have every one of the fuses and circuit breakers. Your phase wires are as follows - brown(A phase), orange(B phase), yellow(C phase)) should be to wires labeled 1, 2, 3 respectively; with 4 to 7, 5 to 8, 6 to 9 wired together. It is easy to build 3-phase dual voltage motors for 240/480 V. I am trying to understand how the different wiring is changing the way the windings get current. Two-Speed, Two-Direction Operation. Click on the product code. To reverse rotation on a single phase capacitor start motor, you will need to reverse the polarity of the starter winding. Think of it like a triangle. However, it will not self-start. The net output or efficiency of the motor is reduced 2/3rd of its rated capacity. A 4 wire 240 volt diagram contains four colored wires: black, red, blue, and white. We begin with a comparison of single-phase (1-phase) and three-phase (3-phase) voltage applications but then illustrate the many ways in which 3-phase motors can be wired to accept high or low voltages, depending on the type of. Model : 4H07M22/A. This type of motor consists of two separate windings. Yes, you can run a 240v single phase motor on two legs of a 240v three phase service. My links to wiring diagrams for bathroom fans, ceiling fans, switched outlets, 2-way, 3-way, and 4-way switches, and telephones can be seen here. Motor control wiring diagram. For example: L1 and L2 indicate that the motor voltage may be 240 volts. 1/2 - 25 hp. . Likewise, for Phase 3, W ----- Z. Step 3. Recognized as a technical leader in its products and services, Franklin Electric serves customers around the world in residential, commercial, agricultural, industrial, municipal, and fueling applications. 240 Volt Single Phase Motor Wiring Diagram. The exact voltage depends on tolerance, geographical standards, and the supply transformer configuration. 3 Phase For The Vs 1 Power Making With Metal. Step 3. short answer: it's because the two, 180 degrees out of phase, feed wires essentially take turns being the return wire every time the phase switches. Depending on how the circuit has been installed, these might be two black wires, a black and a red wire, or a black wire plus a white wire marked with black tape to identify it as a hot wire. AC80, AC90, AC100 single phase motors; 4 wire reversible PSC motor; AS-183 wiring diagram with switch. Direct-On-Line (DOL) Starter. Two circuits were used, with voltage phases differing by one-quarter of a cycle, 90°. Control 3-Phase Motor from more than Two buttons – Power & Control. You can run three phase motors (240 or 480) from upsized VFD's like you mentioned, or run single phase motors @ 240 volts. When this approach is taken, the motor. 2 Kva Transformer Primary 240x480 Secondary 120 240 Jefferson 411 0091 000. Some motors will require a dedicated circuit and specific amperage rating. phase DE1. The motor has a split stator coil that allows for 120V or 240V connection. Connection Diagram: Description: 3226:. RPM 1725/1140. For circuit ampacity motors require 125% of the fla so you need a 20 amp circuit and receptacle also. . No one seems to recall that set up. Complete the wiring for your electric motor (115V or 230V). This application. Green or Green with Yellow stripes = Bare Conductor as Ground wire. Wiring a 120/240 volt motor for 240 volts is as follows: A balanced electrical load which may save on electricity compared to an unbalanced electrical load. They show the relative location of the components. Below is how to wire a split phase motor. Thermal contacts (TB) white M 1~ Z2 - Yellow Z1 - Blue U2 - Black U1 - Red Bridge L1 and L2 if speed controller (S/C) is not required M 1~. Transformer 480v 240v 120v 110v single photocell hubs diagrams stepup wyeWiring 240v 480v 208 230v 208v compressor wellread 240volt capacitor bookingritzcarlton resources breaker corrente indotta leeson 2020cadillac sponsored Square d 75 kva transformer wiring diagram120 to 240. According to NEMA, 460V three-phase is a “Utilization Voltage”, while 480V is a “Distribution Voltage”. Step 3. Fig. Doing voltage drop at 480V appeals to me. 480 volt single phase motors are pretty rare and most I have seen are more or less OEM type motors for. Three-phase motors use coils of wire to create magnetic fields and produce rotation. (3- phase) Machinery Wiring Diagram for motor loads that total up to 3 times the maximum converter rated current. The main winding is split into two sections. Load unbalance can still occur on thisI removed the wiring cover, and the wiring didn't match either diagram on the motor. Single-phase motors tend to be more sensitive to overvoltage than do 3-phase motors. Specs. Three-phase electric power (abbreviated 3φ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. ER 6 OEDM. 98 min 2825. Two-speed, two-direction three-phase motors have two distinct speed settings (usually high and low) and can rotate in both clockwise and counterclockwise directions. The user operations manual or an informational sticker should note which voltage the machine's motor comes wired for. Three-Phase, 240 Volt or 480 volt, 3-Wire Ungrounded Delta: In cases where the only load to be supplied is electric motors or similar 3-phase loads, a delta 3-wire electrical system is satisfactory because a neutral conductor is not needed. Wiring 208v 120v 240v nec iec electricaltechnology3 phase plug wiring diagram 480v 3 phase 6 lead motor wiring diagramDigital 3 phase. The motor will supply the same amount of power, but with a different load amperage. Be sure to make it up correctly depending on the amount of voltage you are providing. You will need a diagram to Track down the box. Motors loads are commonly connected to phases A, B, and C, while single-phase loads are connected to either phase A or C and to neutral. AC65, AC80, AC90, AC100 three phase motors; 3 wire, 3 phase motor; AS-193. But please consider your Inverter current (ampere) rating same rated or higher than motor FLA. The structure of the 1-phase motor determines that the reverse rotation is generally completed by hardware. The industry standard for metering 4 wire services call for the high leg to go on the right, or "C" phase while the code calls for the high leg to go on "B" phase on customers equipment. Motors generate the electrical current that powers the equipment, while capacitors and resistors control the. Wiring diagrams, sometimes called “main” or “construc- tion” diagrams, show the actual connection points for the wires to the components and terminals of the controller. Feeds a 3 phase 240v motor that says it draws 11 amps and a cooling fan that draws 1 amp. For instance , if a module will be powered up and it sends out a new signal of 50 percent the voltage and the technician does not know this, he would think he offers a problem, as he would expect a 12V signal. Starting & Stopping of 3-Phase Motor from more than One Place Power & Control diagrams. pump motor, 230 V to dispenser switch. Diagram DD6 Diagram DD7 M 1~ LN E Diagram DD8 LN E L1 L2 L3 S/C Z1 U2 Z2 U1 Cap. I would think start, run, common. A 480v 3 phase motor wiring diagram is made up of 5 major components: conduit, switches, motors, capacitors and resistors. 240V Motor Wiring Diagram Single Phase. In this case, that amount is 480 volts. L1 is Line 1 in and should be connected to one of the "hot" wires, L2 is Line 2 in and should be connected to the other "hot" wire. 6 wires are from the motor, 1 for grounding if provided, and 3 (L1-3) from the power supply. Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. Note: For single-phase connections and three-phase open delta connections, inputs and outputs may be reversed. The question I have relates to the capacitor wiring when there are 3 out of the motor and only 2 post on the cap. File Type: JPG. I am trying to understand how the different wiring is changing the way the windings get current. It is a type of polyphase system and is the most common method used by electric grids worldwide to transfer power. All wiring and electrical connections should comply with the National Electrical Code (NEC) and with local codes and practices. (3- phase) Machinery (3- phase) Machinery 230 volt (three- phase panel) Off On NOTE: All wiring must be done by a licensed electrician. In order to achieve this, you can swap the connections on either end of the winding. Basic electrical components to wire a s. You must supply a disconnect switch, proper sized wire, enclosures, terminal blocks and any other devices needed to complete your circuit. d) Wye-delta open transition 3-phase motors. Industrial Switch Types | Toggle, Push Button, Selector Switch, Etc. MultiMotors System. Longer life may be found due to a stronger motor, where as 120 volt motors may heat up more. Single Coil of a Single Phase MotorA common 3-phase Delta is the 4-wire Delta. 240/415 3 Phase 4 Wire. Rotor is usually made as squirrel-cage, and it is inserted in stators hole. The motor is a 1 HP, 3-phase, 208-230/460 volts, and I'm wiring a 120 VAC supply voltage into the VFD, which steps that up to 3-phase 230 V. Three Phase Connections: Part Winding Start: 6 Leads NEMA Nomenclature: WYE or Delta Connected. e. With Solved Example. bure961 Senior Member. A capacitor start capacitor run motor is also known as a two value capacitor motor. Even a 40 year industrial maintenance mech. Check all six wires for continuity. Choose one of the two configurations (star or delta) and connect the wires to the terminals accordingly. 5129 Login or Sign Up; 0. Next, use a red wire to connect the switch to the low-speed terminal of the motor. For 240 volts, connect one start winding wire to the junction of T3 and T2 (the start winding is always operated on 120 volts, even if the motor is 120/240 volts), and the other wire to a remaining drum switch terminal. Sigma. The line terminals are specified for black as well as red wires. The black wire is a mains lead, and has a thermal overload switch on it (the weird symbol on the third wire down. Now connect Hot 1 (red color) from the breaker to the A2 terminal of the switch and again, connect the L2 terminal to the water. Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. All you are doing here is, ignoring the two phases in your 3-phase system and using only one of them. 73) than 240. Then, use a black wire to connect the switch to the high-speed terminal of the motor. For 480V Wye connection, phase voltage would be 277. If this motor is installed as part of a motor control drive system, connect and protect the motor according to the control manufacturers diagrams. Incoming DE1 wiring configuration Table 1. See moreThis video will show you how to wire up a 9 wire 3 phase motor to a 3 phase 240 volt system. 240V outlets use two 120V wires simultaneously plus a neutral wire to power a single receptacle older homes and appliances may use three prong 240 volt outle. total power in a Three Phase. and the diagram on the side of the pump is : simulate this circuit – Schematic created using CircuitLab. T1 T2 T3 T4 T5 Motor Lead Wires. The neutral is paired to each of the single phase load. If performing on site, be sure. If the motor has screw posts in the wiring box, there will be an extra screw post, not connected to anything, for connecting leads 2,3,5 together. I want to wire into a single phase supply using a three prong plug. The utility lists the service as a 75 kVA 240V grounded B phase. The wiring diagram for this application is number 5. The wiring diagram connects this to L1 and L2 of the three-phase supply, so. Motor Wiring Diagram 12 Lead, Dual Voltage, Wye Start - Delta Run or Part Winding Start Motors designed by US Motors for Part-Winding Start may also be used for across the line starting using only the full winding connection. All service calls, no matter how minor, should include a complete wiring check, beginning with the building breaker. motor load (hp) single phase 3 phase 120 v. The diagram will also usually show each individual. ER 11 A-32 OGRE. The remaining phase-to-neutral voltage will be √ 3 /2 the phase-to-phase voltage. 05 KB. Room Air Cooler Wiring Diagram # 1. 10A 230 Volt single speed spa motor/pump has 3 wires out Brown, Orange, and yellow. 1. 144 KW Kilowatts. To properly read a cabling diagram, one has to learn how the components within the method operate. In single-phase motors one single thermal switch is used. Photo 4This Magnetic Starter is a 3 phase, full voltage across the line starter with the coil factory wired for 208-240 volts (Figure B). 2A. Three Phase motors require 3 pole starters and each of the "hot" lines must be switched through the. Thermal Magnetic Trip Rating: 80 Amps. Black and red wires are both hot wires, meaning they carry power. This directs the current through from L2 and directs it through the 3 rd phase on the contactor and overload (L3 & T3). Diagram DD6 Diagram DD7 M 1~ LN E Diagram DD8 LN E L1 L2 L3 S/C Z1 U2 Z2 U1 Cap. b) Full-voltage reversing 3-phase motors. Wiring diagram for two speed moto explained. Download Article. Sizing of copper wire and transformers for three phase 230 & 460V electrical motors. The hot wire H1 and H3 are spliced. 1. Inspect the three-phase motor's wiring diagram. The advice I received was to twist the three live wires together and wire them all to the one live prong. The way you make up the motor will be dependent upon the voltage. With the U, V, W pairs that looks more like a three-phase motor modified to run on single phase. A contactor is a device that is used to switch electrical circuits on and off. Single Phase, Single Voltage, 3 Lead, CW or CCW Rotation: 904983 : Single Phase, 115/230V, 7 Lead,. Baldor Motor Wiring Diagram 3 Phase Source: static-resources. Always reverse the wires that lead to the starter winding. Circuit 480v baldor 240v capacitor mikroraPhase wiring diagram transformer 480v panel wire 120v breaker distribution. Other Wiring Diagrams Available: Accessory Connection. The power available is 3 phase, 240 volts line to neutral. Connect the two top terminals on the switch to the L1 and L2 connections in the motor's electrical enclosure. g. Look for the largest deflection between lead #3 and the other two wires. We begin with a comparison of single-phase (1-phase) and three-phase (3-phase) voltage applications but then illustrate the many ways in which 3-phase motors can be wired to accept high or low voltages, depending on the. Dimension: 800 x 629. This diagram helps electricians and maintenance personnel understand the overall. Use a capacitor rated for motor run use, or power factor correction capacitor (s). You. Single Phase supply 240 Volt Coil - see wiring diagram. 73 1000 Single-Phase kVA = Load Volts x Load Amperes 1000 kVA = 120 V x 16. The simplest three-phase system is the 3-wire Delta configuration, normally used for transmission of power in the intermediate voltage class from approximately 15,000 volts to 600 volts. Achieving this level of control requires the use of specialized control techniques. 2-White 6-No color assigned P2-Brown. The starting sequence for the motor is as follows: 1. Set rated frequency of motor ( P1-04) and rated speed ( P1-05 ). Wiring 220-volt boxes and motors is serious business. g. The disconnect box will have terminals labeled "L1," "L2" and "L3. . The standard connection is a three-phase connection,. Simply put, 480V is what the power source supplies, but the equipment within the system is designed to operate at 460V due to power losses. Less frequently, three wires were used, with a common wire with a larger-diameter. Voltage between two Hot Phases = 120V x 2 = 240V (1-Φ). In some arrangements, two capacitors are. 240 volt, 1 phase motors should use a 2 pole starter. In this article, we will discuss the basics of how a 240 Volt 3 Phase Wiring Diagram works, its components, and how to correctly read and interpret it. Table 1. Testing: If at all possible, measure the current when you first turn it on and compare with the rated current. Also check direction of rotation. It has quite good efficacy and low manufacture and preserves costs. [Click to enlarge any image]. I attempted to wire it for 115. 6 Single Phase Motor Connection Diagram. 2+3+8 wire nutted together attached to nothing 7 wire nutted by itself For some reason there is no wire #4. 1 Three Wire Ceiling Fan Connection Diagram With Capactitor. All wiring and electrical connections should comply with the National Electrical Code (NEC) and with local codes and practices. A water heater can be toggled between 240V and 120V supply using a double pole, double throw switch. The neutral wire is shared by all currents returning from the customers’ premises to the supply transformer. 240v Ac Single Phase To 120 240 Split Victron Community. Hi Nasir, You can try to use VFD or inverter to drive your submersible pump. 43Hi Andy, There is a pair of black wires from U2 and V2, and Red (W2), White (W1) and Blue (V1) wires that go into the motor casing. How the wires are interconnected dictates the voltage being supplied to the motor. A split-phase or single-phase three-wire system is a type of single-phase electric power distribution. 23. 3 Phase Motor Starters and Control Circuits. Single Phase Terminal Markings Identified By Color: (NEMA Standards) 1-Blue 5-Black P1-No color assigned. Also, there is no mention on the diagram for a yellow, and an orange wire. The single phase induction motor is similar. It may also show any necessary circuit protection devices, such as fuses or. To solve the problem an auxiliary, usually weaker, winding is added to the motor and it is offset from the main coil by, say, 30°. 3 Phase Motor Winding Diagram. Currently the Motor has two sets of 3 wires feeding it. Identify the black power supply wire and connect it to the center terminal on the switch. . Single Phase Terminal Markings Identified By Color: (NEMA Standards) 1-Blue 5-Black P1-No color assigned. That is 3-phase motors for the 120/208-volt power systems. 4,5,6 are buried down in the peckerhead, all jumpered together. pdf. This means the data plate may show 208-240 volts for low voltage, or it may show 440-480 for high voltage — but these motors will never be compatible with both voltages. It may be hand started in either direction, coming up to speed in a few seconds. The wire with the largest deflection will be lead #6. All the videos I upload is to assist any individual with some thing they might of not know until watching one of these vid. Six wire three-phase electric motors are dual voltage motors. Single Phase, Single Voltage, 3 Lead, CW or CCW Rotation: 904983 : Single Phase, 115/230V, 7 Lead, w/ Thermal Protection, CW Rotation: 906066 : Wye Connection, Dual. Location. Load – This is the device or devices that. Also check direction of rotation. This diagram will also include all of the safety measures and switches that should be in place to help protect the circuit and its components from damage. eps Orange Red Blue Blue Black T1 L123 Motor-Lead Connections. Many 3-phase motors allow for two possible line voltages, for example 230/460. Phase Perfect® digital phase converter uses modern solid-state electronics to create utility-quality three-phase power anywhere. Alternate motor suppliers may be used. The voltage is applied directly to one hot wire and the other hot is joined together with the neutral wire. These appliances include ovens and ranges, dryers, water heaters, air. This type of diagram includes detailed information about the wiring of the motor and the components it is connected to. This is the easiest and quickest method for converting a 3-phase system to a single-phase system. When wiring a 120/240 volt motor, there are two different types of connections. The motor has 3 wires coming out of it, then there are 3 I guess you would call them jumper wires. wiring. A capacitor for starting up the motor. Single-phase installations will normally be 120/240V AC, 3 wire systems. WIRING Connect the motor as shown in the connection diagrams. Input Power Wiring Diagrams (Option D) Input Power Wiring Diagrams (Option D) Smart Series ® B L O C K T E R M IN A L Above diagram depicts two different wiring configurations. As the drawing shows lower right. As Loren notes, the ground should be attached to a ground terminal screw somewhere inside the wiring box. If you have single phase 220 volts, there are phase converters (Google is your friend) to convert to 220 three phase. Maximum 1 Phase Power per Phase = 200 x 240. . And disconnect lines. Step 1: Basic Wiring. 48,000 Volt Amps (VA) per Phase or. In a 240 volt 3 phase system, there are three separate phases, or. Refer to Figure 1 for a detailed internal wiring diagram. Manufacturer’s nameplate for Delta connected 9-lead motor According to the table above, for a high-voltage connection, the electrician would connect L1 to lead #1, L2 to lead #2, L3 to lead #3, wire-nut 4 & 7 together, wire-nut 5 & 8 together, and wire-nut 6 & 9 together. When supplying voltage to motors, stay away from the "outer limits. Each line carries a different voltage and current, which is necessary for the proper operation of the various electrical components in the. MultiMotors System. 48 Kilowatts (KW) per Phase. A dedicated circuit containing 3 wires, two will be the 240 volt lines and one will be the ground wire. It will only develop 2/3 of the 3-φ power rating because one winding is not used. It also shows the difference between Delta and Star connect. Although uncommon you may still find these systems in existence. Three-phase motors will almost always have a bundle of wires coming out the side, meant for connections to both incoming line power as well as establishing. . It is still a three phase output device to control the three phase motors. 240V Motor Wiring Diagram Single Phase. Faster starting power. Three Phase Motor Connection Star/Delta (Y-Δ) Reverse / Forward with – Timer Power & Control Diagram. The switch you have is only rated for 2 Hp. As a memory aid, the three common lines and motor terminal connections create the numbers: 1167, 2248 and 3359. Check Details. Many motor nameplates have 230 volts or 115/230 volts. These are the general setup and may vary and depend on the installation e. 5 C FPZ, Inc. They show the relative location of the components. Search. 115V 60Hz. The B phase is center-tap. connection diagram) is used on the 208-volt pow-. The loads are: one 240V 3 phase 17 amp full load amp air conditioner one 240V 3 phase 32. NEC Color Codes for 240 V And 480 V Wiring in Three-Phase Systems. 4 Four Wires Motor Connection With Capacitor. The electrical riser diagram shows 120/240 volt 3 phase. One other important difference between 3-phase power vs. The motor has three wires coming out of it, and according to Auburn Armature Inc (whose sticker is on the newly rebuilt looking motor), they said if we had three phase 460 volts going in, we could just connect the power and it would be fine. 5kW (10HP) in domestic areas (consumer unit for home). The load will slow the motor down. 480V 3 Phase Motor Wiring Diagram Source: 480V 3 Phase Motor Wiring Diagram Source: i. Each phase carries 120 volts, with a total voltage of 240 volts when all three phases are combined. The transformer actually steps down the voltage to 240 volts, so the two legs are a complete 240 volt circuit. Solved A 3 Phase Electrical Motor Wiring Diagram With Chegg Com. Damage will occur if the motor is operated with. Figure 7: 230-volt operation of a delta-configured dual-voltage 230/460 VAC three-phase AC induction motor. Like, subscribe and don't skip the ads. co. Install a relay with two sets of contacts, one for forward operation and the other for reverse operation. Without them, it’s unlikely you’d be able to troubleshoot any issues that occur or. In case of three phase spa wiring, use 12 or 10 gauge wire size for each line. Over 20 years of development has resulted in a robust and durable phase converter capable of powering any load, from hard-starting motors to equipment. This diagram will also include. Three-phase power can be defined as the common method of alternating current power generation, transmission, and distribution. We would like to show you a description here but the site won’t allow us. neutral wire may be needed for three phase 240V outlets etc. your 3 phase wiring is 440 phase to phase, but 220 phase to ground (green). 3phase Air Compressor Wire Connection,how to wire 3 phase air compressor.