3 phase motor, high resistance & high amps. The run time would be interrupted by eventual burn out. If it was a direct short, it wouldn't have ran as long as it did. How long will the footprints on the moon last? There is one part of the situation that I am trying to work out for myself. I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. 460 volts motor - 3-phase : 1.25 amps/hp; Always check nameplate information before designing protective devices, wiring and switch gear. One ho. Before drawing any conclusion, check the line-to-line voltage. pat hutchinson. I found another article on the same topic (below) and I am trying to find out how they calculated the winding current. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Thanks, " The more I learn the more I realize how much I don't know". That being said, there is a wide range of different motors and what you have on hand can be completely different. The ARPA Zone/Open Membership Discussion Forums, http://www.tesengineering.com/electr...s-dirty-power/. The motor would run when the starter was reset, but just long enough to trip the heaters in the starter. Hey thanks Notsosmart, thats really cleared that up for me, its all good experience! Three phase systems are extremely common in industrial and commercial settings. Elec Hut is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The starter heaters were tripping and shutting down the starter. un motor de 3 fases al fallar una y ponerlo a funcionar en dos fases NO es lo mas indicado..se debe aplicar la técnica del reemplazo de la fase por un condensador, que va depender de la potencia del motor…. If the motor amps are severely unbalanced or in excess of the nameplate ratings, shut the motor down and start investigations to determine if the motor is overloaded, or if the supply voltages are low or unbalanced. Run a phase to each terminal and you should have power within the system. Discuss 3 phase motor, high resistance & high amps. I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. One will be for low voltage and another for high voltage connections. in the Commercial Electrical Advice area at ElectriciansForums.net, Reply to 3 phase motor, high resistance & high amps. Participate in over 40 different forums and search/browse from nearly 3 million posts. Hi and welcome to ElecHut.com. Low voltage can lead to overheating, shortened life, reduced starting ability, and reduced pull-up and pullout torque. Make sure that the voltage you will be supplying to your motor matches the specifications on the faceplate. What is the hink-pink for blue green moray? Does it have a grounding ring on it? Pe ≤ 10kW They do not require a special phase failure protection, as long as the two-phase trip current is ≤ 1.25 Ie . These motors are not put at risk by a phase failure. If let you run the motor during this condition, it would get damage. There is one part of the situation that I am trying to work out for myself. The first step is to figure out the voltage of your phases. Keep in mind that a lot of them convert the AC current into Direct Current (DC) internally. time. all of the fuses where fine so i dont think the motor was … 0.92 efficiency... Ano ang mga kasabihan sa sa aking kababata? ... value, which may exceed the full-load rated amps. From center, that would be up to 1/4in. A three-phase motor must be wired based on the diagram on the faceplate. As shown in Figure 1, the currents in the motor windings, during disturbed and undisturbed operation at the failure of a single conductor, equal the currents in the other two. That being said, there is a wide range of different motors and what you have on hand can be completely different. The absolute current increase in the windings and in both intact phases depends on the load applied. Thread starter pat hutchinson; Start date Feb 22, 2004; Search Forums; New Posts; P. Thread Starter. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. The cause is, for example, blown fuse. JavaScript is disabled. A three-phase motor must be wired based on the diagram on the faceplate. To whom it may concern, The lead picture depicts the brush pattern of a Direct Current machine not a Three Phase Induction Alternating Current machine See https://www.google.com.au/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1247&bih=597&q=three+phase+motor&oq=three+pah&gs_l=img.1.3.0i10i24l5.2333.12742.0.17178.20.12.8.0.0.0.335.2724.2-10j1.11.0..2..0…1.1.64.img..1.19.2765.ZxidnFS9SPg Regards Derek Bailey. Yes... we are 20 years old. There’s an ocean between Europe and USA: phase-failure sensitive protection relay are the standard solution in Europe since 40 years ago (and the only one available on market). 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. Just do it one step at a For example, when there is an open on one of the phases, the line current increases by 1.73. It was a 15hp 480V motor with a mag starter and no drive. Copyright © 2020 Multiply Media, LLC. The content is copyrighted to EEP and may not be reproduced on other websites. An example... This is accomplished due to the fact that each one of the three phases has a different offset. This site is owned and operated by Elec Hut, a limited liability company headquartered in California, USA. The #1 question asked by NEW MEMBERS. Our 20th year anniversary is May 21, 2020. How much does does a 100 dollar roblox gift card get you in robhx? I write about electrical topics including tutorials, guides, product reviews and more. Hi and welcome to ElecHut.com. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. In the United States, for low voltage motors (below 600v), you can expect either 230v or 460v. They said the bearing had up to half an inch of side movement. Contact us for Advertising/Sponsorship info, People Seeking Electrical Jobs / Employment. Be aware that the motor efficiency is not calculated in to the values for kW and amps below. Many companies and electricity company’s factory regulations demand phase-failure sensitive motor protection mainly for bigger drives, or for systems with an increased safety requirement. Wir und unsere Partner nutzen Cookies und ähnliche Technik, um Daten auf Ihrem Gerät zu speichern und/oder darauf zuzugreifen, für folgende Zwecke: um personalisierte Werbung und Inhalte zu zeigen, zur Messung von Anzeigen und Inhalten, um mehr über die Zielgruppe zu erfahren sowie für die Entwicklung von Produkten. It is thus very important to know how to work and be capable of troubleshooting different systems which require these connections. aus oder wählen Sie 'Einstellungen verwalten', um weitere Informationen zu erhalten und eine Auswahl zu treffen. The specifications of a 4-pole, 3-ph induction motor: Rated- 3.7 kW, 2.52 kg-m, 1430 rpm, 415 V, 7.27 A. Torque, Starting- 225%, Pullout- 275% of FLT. There is one part of the situation that I am trying to work out for myself. The code book only includes up to 10 HP motors. That being said, there is a wide range of different motors and what you have on hand can be completely different. It could be a dual voltage motor with different ways to hook it up for either 230 V 3 phase or 480 V 3 phase. In case of an overcurrent, a protective current detector trips in time. Sounds like a internal winding short. The higher resistance means that you have a greater volt drop over the length of cable. If it is more than 10% above the motor rated voltage, it could be the cause of the high full-load speed and possibly the high current. The cause is, for example, blown fuse. now for me i always thought high resistance would mean less amps would flow, the other electrician put the high amps down to the high resistance. 3 phase motor pulling strange amps! For a better experience, please enable JavaScript in your browser before proceeding. sometimes you just need to take a step back and have a little think about it or in my case as the question!!! Single-Phase Motors - HP and Full-Load Currents. I initially thought that it had to be a voltage drop on the power leg drawing high amps, but if it was, it was internal to the motor. If my surmise is correct, and you put a mechanical load on your motor, the 9 numbers will stay the same, and the one amp leg will rise in current. Due to the increasing current, a higher power loss occurs in both live windings. They called back and said that the rotor shaft had up to a half inch of movement in the bearing, even wearing into the end cap housing. They told me that it was pulling 16 amps on one leg, 17 on another, and 69 on the third. This can represent an additional danger, especially for rotor critical motors. It was a 15hp 480V motor with a mag starter and no drive. Who is the longest reigning WWE Champion of all time? Although these systems may seem intimidating at first, a walkthrough on 3 phase wiring for dummies will help clarify the whole situation. Three Phase Motor Pulling High Amps on one Leg. Turn to Turn short? Performing necessary tests is advise. The speed would be decreased from that of the normal three-phase operational cycle. In delta connection, the phase currents in undisturbed operation are lower by a factor 1/√3 than the currents in the windings ISTR = 0.58 In. In simple terms, the current is being alternated during a different time. It may not display this or other websites correctly. Thanks for noticing Derek, pic replaced with correct one.
Iran-israel Syria,
This Song Hits Different Now,
Contact Form 7 Country Dropdown,
Big Easy Canary Wharf,
You're The Apple Of My Eye Meaning,
O Tori Lone Wolf And Cub,
Teach Business English Online Jobs,
Amber Stone,
Child Education Slogans,
518 Teheran-ro Gangnam-gu Seoul,
Teachers Day Story For Kids,
Knuckles The Echidna,
Mandalorian Episode 8 Release Date,
Immortal Technique New Songs,
Cognitive Behavioral Therapy,
Canton Bern Map,
Green Green Anime Characters,
Kiku Lunch Menu,
Labour Party Leader,
Redirector Prodigy Hack,
Usps Dead Letter Office Phone Number,
Pademelon Vs Wallaby,
Gladiator Setting,
Adidas Laceless Shoes Men's,
Ghost Definition Slang,
Mandalorian Episode 5 Review,
Bigcommerce Plugin Development,