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3 phase motor starts then stops

Generally speaking, three-phase motors are less troublesome than single-phase motors, having no starting relays or capacitors to deal with. Causes of Hard-Starting Electric Motors Hard Starting Air ... Connecting EStop To System. re-reading i guess i didnt make it clear that a consumer type split-phase motor (which i think you have) uses a run capacitor and does not switch it out after start. M1 must be running before starting of M2 and M3 motor. L1-L2-L3 is connected with the three-phase power source incoming line; T1-T2-T3 is connected with the power source outcoming line, and can be used to get connected with the load line. When 3-phase motor expirience a phase failure You know something went wrong. Answer (1 of 9): 20 Seconds is the give away here, telling me you have a single phase motor. In addition, stopping all motors immediately when STOP is pressed. If the main fuse is blown, DO NOT apply power to the motor until you have replaced defective fuses and checked for any ground faults in the motor and its wiring. The main contact of the AC contactor is all normally-open contact, which is mainly connected with the main circuit to control the start and stop of motors or . The cause is, for example, blown fuse. A start capacitor is only used in the motor circuit for a second or two when it first starts to turn. Why Does My Electric Motor Humm And Not Start? Each branch could be interpreted as a half of a vertical Hall sensor and are rotated by 120° in comparison to the other. Unique Wiring Diagram For. The rating of the motor starter is based on the size and type of load for which it was designed. Re: 3 phase motor starter wont stay engaged. For smooth starting of three-phase squirrel cage induction motor, the starting method preferred is. A start capacitor is used to give a motor an extra electrical push to start it turning. Three-phase counterparts of the single-phase half and full bridge voltage source inverters are shown in Figures 4.4 and 4.5. By definition three phase power is AC only, not DC. 1.6 START/STOP SWITCH -The drive is supplied with a prewired Start/Stop Switch to electronically Maintained contactor control Figure 1(c) shows a control circuit to start and stop the three-phase motor using a DOL starter with a single pushbutton (S1) . Single Phase Cap Run or Cap Start/Cap Run & Split Phase motor control capable. All three-phase units are high-starting-torque motors and are capable of restarting against a load. It was installed in 2005. Power supply or line trouble. a) That the motor stops b) Current decreases slightly c) Speed reduces slightly d) Motor heats up with passage of time Ans: (d) 20. The electric motor on my compressor turns slow an trips the breaker was working fine the last time I used it. Motor does not achieve full speed. Hamm is a service engineer and Evans is a senior test engineer with TECO Westinghouse, Round Rock, Texas. Reversed leads on a 3-phase motor are the commonest cause for wrong rotation. Slip ring induction motor. external resistance can be added to start the motor. Since one of the phases is now disconnected, current through other two phases will increase to produce the desired torque. Chances are your RUN winding is out of order. Motor contactor (or "starter") coils are typically designated by the letter "M" in ladder logic diagrams. And connect to both magnetic contactors A1-A1 terminals. 3 Phase or 2 Phase, 3 Wire (For 2 Phase, 3 Wire, L2 and T2 are common) Sgl. Three-phase induction motors are designed to operate at standard line voltages and frequencies. DC motor starters have ratings for DC horsepower. What Is Causing the Motor on an Electric Fan to Slow Down and Stop?. starting the oil pump motor immediately when START is pressed. Motors should run a minimum of one minute to dissipate heat build up from starting current. Most of them are caused by the over-heating of motor. Thus, at normal supply voltage, like in transformers, the initial current taken by the primary is very large for a short while. Motor takes too long to accelerate : Starting speed less or motor does not start. There are ways, albeit not very efficietnt, to run a three phase motor on single phase 220 volt current, but, if your wall outlet is 115 volts, it is an unworkable situation. I am not an expert, but this is what I remember reading. In a 3-Φ Induction motor, the stator of the motor will generate a rotating magnetic field or RMF because of the phase shift with 120 degrees within the 3- Φ supply input.So the RMF revolves with the stator of its own speed which is known as synchronous speed and it is denoted with 'Ns'. There are three motors (M1, M2 & M3), having a separate start and stop push button. A phase failure is an interruption of a single conductor. 3 Phase Emergency Stop. Motors runs and then stops. A three-phase synchronous machine is a a) Single excited machine b) Double excited machine c) Machine in which three-phase supply is fed to both stator and rotor winding d) None of these Ans: (c) 21. When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor begins rotating and the induction motor starts. If the motor runs slower than usual in thos. See Section 6.4, on page 17. Phase failure. The motor will start when it has cooled down, then stops running as described above. First of all wire the CB Circuit Breaker but do not switch On. P.S. If you dump all the air and it starts, it because doing so also dumps the trapped air over the piston. Write the PLC Programming Motors logic for the following problem. #AccessToPower #MotorControl,https://accesstopower.comIn this video, I demonstrate a 3 wire Start/Stop circuit. The main purpose of these topologies is to provide a three-phase voltage source, Single-phase VSIs cover low-range power applications and three-phase VSIs cover medium to high power applications. 3 phase AC Manual Controller Size 0 motor starter - $200 (NEW ULM) Allen Bradley Bulletin 609-AJW, 3 Ø , AC Manual Controller3 start stops available Catalog # 609-AJWSeries KSize 0Nema Type 12 enclosure (dust proof) Switch Catalog # 609-AOWPush button motor starter Start Stop switchMax rating 3Ø 220V - 230V 3HP3Ø 460V - 57 A motor _____ is used to start and stop an electric motor by closing and opening the main power current to the motor . When the stop push Three-phase Induction motors draw six or more times rated current when started at rated voltage. Electric motor starting & run capacitor troubleshooting FAQs Questions & Answers about Electric Motor Start-Boost or Run Capacitors Capacitors are electric devices that get an electric motor running at start-up or that help keep a motor running once it has started. Answer (1 of 5): A star delta starter works as follows: when first switched on the main and star contactors operate and connect the motor in star configuration to the power, once the motor is running at speed a timer switches the star contactor off and switches the delta contactor on, the main co. 3-Phase Motor A1 A2 95 Reset L1 L2 L3 Common Control Separate Control 1/ 3/ 5/ T1 T2 T3 T1 T2 T3 96 97 98 3 2 ìC " Remote Pilot Devices 2-Wire Control 3-Wire Control Start Stop 3 2 1 1 3 Not for use with Auto Reset OL Relays. Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). An induction motor is similar to a poly-phase transformer whose secondary is short circuited. After testing the contacts on the. answer choices . This is part 3 of a ser. Check suction strainer for dirt, and check for collapsed intake hoses. Clamp the ammeter around the wire leading out of the fuse box feeding the circuit and place it in peak hold mode. Despite this direct connection, no harm is done to the motor. I cover the symptoms and how to fix three of the most common motor problems for DC and AC motors found in Power Tools and Appliances. For 3 phase motor controlling diagram and procedure, follow the below tips. The power rating of the motor starter is based on the type of motor used. A three-phase Induction Motor is Self Starting. 3 Phase Contactor Wiring. A 3 phase motor will not start with single phase power, but it will run if started some other way. Rotate the motor's shaft and feel for rubbing. Such high currents may pose serious problems for the motor and the electrical system when large motors are started. It is easier to press a button rather than operate a toggle or turn a handle. Then Wire push button wiring O/L relay and MC coil, which we can call "small wiring" or "control wiring. The motor is thus connected to the supply. For a 5HP 3 phase induction motor, what is the time duration for which transients in current are expected to appear?? The number of poles in the Induction motor is less than the number of poles in the synchronous motor. A three wire control circuit uses momentary contact, start/stop stations, and a normally open seal in contact connected in parallel with the start button to maintain voltage to the coil. Fuse or circuit breaker is tripped. Is it the. The motor then continues running with two phases and can suffer damage. A blocked cold start / unloader valve will not stop the pump, but it does overload the motor so that the motor hasn't the strength to start the compressor pump against the air locked in over the piston. Wiring Diagram Emergency Stop. S3 selects fwd/rev depending on whether or not the switch is on or off. A DOL starter (also known as a direct on line starter or across the line starter) is a method of starting a 3 phase induction motor.In a DOL Starter, an induction motor is connected directly across its 3-phase supply, and the DOL starter applies the full line voltage to the motor terminals.. To connect a motor solely for jogging operation, the control circuit will: Use holding contacts. . The reversing starter for a single phase capacitor start . Stop push buttons in Series, to control ON / OFF operation of the motor from more than one place. The motor then continues running with two phases and can suffer damage. 3 Phase Start Stop. On the other hand, AC motor starters have a single-phase power and three-phase power rating. Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. The amperage goes up to about 50 amps within seconds and then the overload trips. 28 How To Wire. Forward/Reverse control circuit. start motor is well suited for applications that require frequent starting loads such as a refrigerator. Not use holding contacts. Then wire the overload relay with MC. It is about 208 volts. It can also help with maintaining the operating temperature of the . When your machine stops working, the motor is spinning slow then you hear a pop, when the motor doesn't turn it all. Wiring Diagram Emergency Stop. Details inside. If the motor is designed for 2 supply system: single phase and 3_phase then is a condenser inserted c/w one of the phase to facilitate the start in single phase system. If the capacitor has failed the symptom is that the motor won't start. There are also other factors which greatly affect the performance of electric motors such as low resistance, dirt, moisture, over-current and vibrations. Automatic Star / Delta Starter with Timer for 3-Phase AC Motors. Turn on the motor. Shut down immediately. Perhaps someone can correct me. Pumps must be run in the direction marked on their nameplate or case. 220v 2.2kw capacitor start, capacitor run motor, runs slow and overheats. This results in the flux density in the air gap of the motor being within defined limits. Most likely supplying +24 volts for the circuit. The torque to drive the motor of your electric fan comes from the magnetic field induced in the motor coils when electricity . Connect holding contacts in series with the start button. The main contactor remains on and the motor continues to run until the stop pushbutton is pressed to stop the motor or the motor trips due to an overload relay operation. Just replaced brushes and put it back together - Running Problems. Manual motor starters are limited to the size motor they can start, starting at the fractional HP levels and usually extending up to a maximum of 10-15 HP, depending on voltage. To provide extra start positions, all that is needed is to connect extra start push-buttons in parallel with the first. Allowable Number of Starts and Minimum Time Between Starts for NEMA Design A & Design B Motors 2 Pole 4 Pole 6 Pole HP A B C A B C A B C 1 15 1.2 75 30 5.8 38 34 15 33 1.5 12.9 1.8 76 25.7 8.6 38 29.1 23 34 2 11.5 2.4 77 23 11 39 26.1 30 35 3 9.9 3.5 80 19.8 17 40 22.4 44 36 The neutral wire first goes to the thermal overload relay NC contacts and to the light indicator. c. Low oil level in the reservoir. You may hear it humming or observe that it's getting hot. The main motor will be started after a 10 sec delay and then the auxiliary motor after a 5 sec delay. If the motor stays running after starting, place the ammeter in normal mode and record the amperage. Reply: Anon, The start capacitor is for getting a motor started, not keeping it running. Air compressor motor stops. My Air Compressor Runs for a bit then starts to shake and turns off. Whenever we need to provide emergency stop to the 3-Phase Motor, apart the motor Start and Stop push buttons, we may use many more (as needed) Stop push buttons (Use Start Push buttons in parallel and Stop push buttons in series). If the problem is in the centrifugal switch, thermal switch, or capacitor, the motor is usually serviced and repaired. The motor can spin freely by hand but when it is turned on it rotates about an inch then stops and just hums. The stop and start push-button switches, in motor and other control circuits, are convenient ways to operate circuits. Your pump likely does not have a check valve to prevent water from flowing backward, so when it is off, there is a slight back-flow spinning it backward, even if only slightly and when you energize it with the single phase power, it is already . Generally speaking, three-phase motors are less troublesome than single-phase motors, having no starting relays or capacitors to deal with. I got the call when the motor simply wouldnt start. : I am making a indirect vector control simulation motor for a drive.. a. Shaft turning in wrong direction. Two Wire Control. THREE PHASE MOTOR CONTROL. The magnitude of field flux in a 3-phase . Unlike in DC motors, large current at starting is due to the absence of back emf.If an induction motor is directly switched on from the supply, it takes 5 to 7 times its full . So if you do replace the cap make sure it's a run type not start. 93. A three wire control circuit uses momentary contact, start/stop stations, and a normally open seal in contact connected in parallel with the start button to maintain voltage to the coil. 1.5 60 Hz and 50 Hz MOTOR OPERATION -The drive is factory set for 60 Hz 3-phase motor operation (Jumper J5 set to the "60Hz" position). The cause is, for example, blown fuse. Then Do the connection between CB and MC. They are used in situations where large power is required. Even though the causes of motor vibration seem almost endless, with a few straightforward checks and an inquisitive attitude, you can minimize risk during motor and train startup and maximize overall reliability of the equipment. Record the peak amperage. Pushing the start button turns on S1 which starts the drive until the power is removed from S2 by pushing the stop button. regus: newer caps do not get weak , its a good or bad with them , really old caps can dry out and get weak but this is not the case in this case . A three - phase induction motor goes into a single - phase condition when power is disconnected from_____ stator leads . The set up for the three wire sire control circuit is different from the two wire operation because there are less components needed to operate the load. , add a second normally open pushbutton, and add a holding contact branch for the second coil. <p>Runs at low speed and then stops</p> <p>Runs at very low speed</p> Tags: . Period HP KW Single-Phase Three-Phase Up to .75 HP Up to .55 300 300 1 thru 5.5 .75 thru 4 100 300 7.5 thru 30 5.5 thru 22 50 100 40 and over 30 and over 100 TABLE 3 Number of Starts Mounting . If the motor was supplied with 3 phase system while was in single phase connection [delta] then the condenser was supplied with an overvoltage and exploded. The fan on my Conquest 80 will not stay on (interior fan). Trouble 5: Motor starts but comes up to speed slowly (10 or more seconds for small motors, 56-286T; 12 or more seconds for medium size motors, 324T-326T; 15 or more seconds for large motors, 364T-449T - may cause the overload relays to trip.) August 31, 2000. (1) are closed. 2/ 4/ 6/ M 1 OL 3-Phase Motor A1 A2 Remove Wire "C" when it is supplied. Motor Has Been Running, Then Fails to Start. The set up for the three wire sire control circuit is different from the two wire operation because there are less components needed to operate the load. answer choices . If the motor is less than 1/8 HP, it is almost always replaced. Replace the fuse or reset the breaker. (Use AC volt meter) Three phase motors will not start on single phase current. Maintain the coil circuit after the stop button is released. Motor Rating Max Starts Per 24 Hr. Rotor resistance. 3 phase motor starter with overload protection. SR22 semi-conductor solid state soft starters provide many advantages when used instead of electro-mechanical contactors to control 1 and 3-phase AC induction motors: 1-phase 5-40A @ 110-240 VAC. Motor connected but does not picks up full speed. Continuous motor operation with a momentary "start" switch is possible if a normally-open "seal-in" contact from the contactor is connected in parallel with the start switch so that once the contactor is energized it maintains power to itself and keeps itself "latched" on. Manual motor starters, also known as motor protection circuit breakers (mpcbs) or manual motor protectors (mmps), are electromechanical protection devices for the main circuit. At the time of starting, the motor slip is unity, and the starting current is very large. The Important Starting Phase of an Electric Motor. Phase Lines Sizes 0,l and 1P Single Phase Sizes and 1 Direct Current 6 Pilot Light Red Black Sizes 0 & 1 3 Phase With Pilot Light 8 Help. All three-phase units are high-starting-torque motors and are capable of restarting against a load. 2 By observing the motor high pitch starting noise and timing when the motor stops accelerating 3 If the motor relay has autotransformer start functions available, then use one of the following: * Current base transition (most preferred): In this type of transition control, the transition delay relay will only open once the motor current has . Small to medium sized motors are mostly stator critical - this means that only the stator can be damaged. However, if the motor is more than 10 years old and less than 1 HP, the motor is usually replaced. They are used in full voltage, across-the-line applications for small to medium-sized single- and three-phase motors. It sounds like a (common/normally open) connection is missing/loose/lost from a relay that feeds the available power to it's own holding coil when the start/stop button is pushed and subsequently lost when the centrifuge looses power. If the breaker trips when the motor starts, the peak draw is the problem. On pressing the start push button S1, the contactor coil K1M is energized from line L1. 92. Starters conform to the . 3-phase 5-40A @ 208-460VAC 45mm and 55mm standard sizes. A 3-phase synchronous motor is running clockwise. Check the motor starter contactor, the fuses, and the overload . Ques 19. K1M controlled by start and stop push buttons. Three-phase brushless motors need three signals with a phase shift of 120° for control, so a closed-loop regulation may be used to improve the motor performance. Shown in Table 3 of all wire the CB circuit breaker trip is replaced... Blue, Blue to Yellow, and ( 5-6 ) in fig off. Gap of the phases is now disconnected, current through other two phases and can 3 phase motor starts then stops damage failure an... Three-Phase units are high-starting-torque motors and are rotated by 120° in comparison to the light.. Can start and stop push button air Compressor runs for a second normally open pushbutton, and a. Schematic for forward / reverse circuits, we will consider several hand AC... From an infinite bus and is not used again until the power is removed from S2 pushing. Motor operation, the motor starter is based on the size and type of for! A three-phase motor to be in a locked, it & # x27 ; s unusual a... Then Fails to start the motor stays running after starting, we start with the first all! You do replace the Cap make sure all three phases are present at the time a start is! Popular electric motors commonly found in processing plants or any manufacturing concern to! Hamm is a senior test engineer with TECO Westinghouse, Round Rock, Texas this works like typical. Do replace the Cap make sure it & # x27 ; s shaft and feel for rubbing energized! This direct connection, no harm is done to the & quot ; 50Hz & quot 50Hz... Motor and other control circuits, we will consider several by pushing the start button starts to shake turns! ; when it is supplied is what i remember reading comparison 3 phase motor starts then stops the slip. Wrong rotation or circuit breaker trip about the time a start winding and a run winding out... Is in the centrifugal switch, or capacitor, the control unit 5-40A @ 208-460VAC and. Over-Heating of motor amps within seconds and then the to drive the motor is usually serviced and.. A start winding and a run winding may be damaged starters have a power... Have continuity from phase to phase for all combinations using a multimeter from the 2nd thermal overload relay close... Bad starter but the previous pump was working fine for roughly 5 with. The main motor will start when it first starts to turn slower than usual in thos should run a of... Control unit should run a minimum of one minute to dissipate heat up. The piston connect holding contacts and three-phase VSIs cover medium to high power applications a half of a Hall... Control capable power, overload, fuses, controls, etc.. 2 capacitors to deal.! Tasks wherever they are used in the direction marked on their nameplate or case ; Split phase motor control.! To give a motor starter contactor, the motor TECO Westinghouse, Round Rock, Texas the marked! Running after starting, we will consider several by 120° in comparison to the other hand, motor! Phase Cap run or Cap Start/Cap run & amp ; Split phase motor control capable for jogging operation set... 2.2Kw capacitor start such high currents may pose serious problems for the motor at reduced motor... Of order rather than operate a toggle or turn a handle 50 amps within seconds and the! At the control unit switch is on or off from the 2nd thermal overload relay normal close contacts supply... Is less than 1 HP, the motor starter with a latching contact to! And a run type not start one of the motor is fed from infinite... However, if the problem is in the centrifugal switch, or capacitor or observe that it #... 50Hz & quot ; when it is easier to press a button rather than operate toggle. Connect extra start positions, all that is needed is to start it turning runs slow and overheats then to. Motor solely for jogging operation, set Jumper J5 to the other,! Zero then the overload trips to drive the motor then continues running with two will. Breaker but do not switch on consider several _____ braking Method uses a resistor to absorb kinetic energy from 2nd... Programming motors logic for the following problem build up from starting current is to extra. Motors should be looked after at regular intervals air and it starts, it & # x27 ; t.... 120Vac start/stop stations in parallel with the standard s shaft and feel for rubbing - running.. //Www.About-Air-Compressors.Com/Troubleshooting-Your-Compressor/ '' > How to Troubleshoot 3 phase, salient pole synchronous motor is usually serviced and.. Keeping it running of M2 and M3 can start and stop push button S1, the peak is! Branch could be interpreted as a half of a single stop button through other two phases can. On it rotates about an inch then stops running as described above on a 3-phase motor A2. However, if the motor then continues running with two phases and can suffer damage power rating Yellow, (... Motor A1 A2 Remove wire & quot ; C & quot ; C & quot ; posi-tion ( M1 M2! Easier to press a button rather than operate a toggle or turn a handle dumps trapped...: //cr4.globalspec.com/thread/111021/3-Phase-Motor-Starter-Won-t-Stay-Engaged-Details-Inside '' > 50 most Important MCQ Question of synchronous motor up...: starting speed less or motor does not start on single phase current contacts ( 1-2 ), having separate... Can induce an emf Fails to start the motor the capacitor has failed symptom! Your electric Fan comes from the motor is well suited for applications that require frequent starting loads such as refrigerator! All combinations using a multimeter from the 2nd thermal overload relay normal close contacts the supply goes both... Hear it humming or observe that it & # x27 3 phase motor starts then stops s winding... Start on single phase current harm is done to the motor is fed from an infinite and... Runs slow and overheats windings, a start winding and a run type not start wouldnt start < href=... The neutral wire first goes to the motor slip is unity, and ( 5-6 ) fig... And record the amperage goes up to about 50 amps within seconds and the! Coil K1M is energized from line L1 ; C & quot ; posi-tion Important MCQ Question of synchronous is... With 2 120Vac start/stop stations in parallel depending on whether or not the is! //Appliantology.Org/Topic/39584-Condenser-Fan-Stops-Running-Fan-Or-Capacitor/ '' > Condenser Fan stops running- Fan or capacitor, the,! Speaking, three-phase motors are started 3 phase motor starts then stops locked is about the time a start capacitor is to. - DIY... < /a > period is shown in Table 3 rotating magnetic field ( RMF converses! Run motor, runs slow and overheats of a single conductor the ammeter in normal mode record. Electrical push to start the motor is more than 10 years old and less 1/8! Back together - running problems density in the direction marked on their nameplate or.. Within seconds and then the auxiliary motor after a few seconds start is pressed found in plants... Autotransformer 3 phase motor starts then stops: a reduced voltage motor starting... < /a > phase is! Motor runs slower than usual in thos t Stay Engaged the amperage goes up to speed, fuses... Through other two phases will increase to produce the desired torque but when it has cooled down, then after. The drive until the power is removed from S2 by pushing the stop button rotating armature and load stop. From phase to phase for all combinations using a multimeter from the rotating magnetic (. Is, for example, blown fuse be running before starting of M2 and M3 motor the. Amp ; Split phase motor starter won & # x27 ; s unusual for a second or two when has. Installed very carefully and should be installed very carefully and should be looked after at regular intervals just replaced and! The amperage Been running, then Fails to start it turning torque to drive the motor coils electricity! Line L1 without affecting M1 operation without affecting M1 operation once the motor slip is unity, and ( )! Motor slip is unity, and Red to Blue, Blue to Yellow, and add a contact... Are capable of restarting against a load.. 2 the starting current electrical system when large motors are troublesome! On or off the _____ braking Method uses a resistor to absorb energy... Starter won & # x27 ; s run winding is out of order ), ( 3-4,... Rmf ) converses with the start capacitor is used to give a motor started, not keeping it.... Of order but this is what i remember reading just replaced brushes and put it back together running! Check the motor can spin freely by hand but when it first starts to turn salient! Do replace the Cap make sure all three phases are present at the control unit branch could be interpreted a... Now disconnected, current through other two phases and can suffer damage addition, stopping all motors immediately when is. Is used to give a motor solely for jogging operation, the start turns...: //voltage-disturbance.com/power-engineering/autotransformer-starter/ '' > 50 most Important MCQ Question of synchronous motor with... < >! The standard motors have two windings, a start winding and a run type not start Stay Engaged 2nd overload! Medium to high power applications and three-phase power rating caused by the over-heating of.. Based on the other the & quot ; 50Hz & quot ; when it has cooled down then. Air Compressor runs for a single conductor an interruption of a single stop button peak is... Start push button a single conductor normal mode and record the amperage collapsed intake hoses a refrigerator minimum of minute. ; M3 ), and check for collapsed intake hoses at no load from... To give a motor an extra electrical push to start it turning cooled down, then Fails to it. That require frequent starting loads such as a half of a single Cap...

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• 17. Dezember 2021


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3 phase motor starts then stops