For single-phase motors, all of which are low-voltage, a properly rated wall plug is a code-acceptable disconnect. Single-phase motors tend to be more sensitive to overvoltage than do 3-phase motors. The nameplate said 4. Cleaning and baking the windings may be all that's needed. SEER = (1 EER100% + 42 EER75% + 45 EER50% + 12 EER25%)/100, Total Heat (BTU/hr.) Vashi Integrated Solutions Limited. The motor would run when the starter was reset, but just long enough to trip the heaters in the starter. I see that you have another 3-phase tool--tablesaw. Just convert that wattage to kW; 1000W = 1kW. Contamination from dust, dirt and chemicals is one of the leading causes of motor failure. h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and disconects, even changed out one transformer that was leaking oil out of a bushing and no luck. An operating three phase motor has voltages measured with a voltmeter on each phase of 453, 458, and 461 volts, amperage measured on each phase with an ammeter are 14.1, 13.9, and 13.8 amps, power factor was measured as 0.82. If not that narrows it down to imbalance power supply or high resistance connection or remotely some kind of problem with motor (swap leads at that point and see if the high current follows the motor lead to narrow it down). You also need thermal overloads if not internal to the motor. The total KW of the heater is 15 KW. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. This is an 'unbalanced' 3 phase supply as far as the motor is concerned, and while it WILL work, the motor will develop less staring torque, less full load power, and more noise - and it WILL draw . Use a clamp on the meter to check the amps when the motor is running to identify if there is an overload occurring. If a three-phase motor has been submerged in water but not energized, there's a good chance it won't need rewinding or replacing. Very often, I have to check out used motors before we put them back in service on other machines. Power measurements. how to determine the ampere rating of a 3phase coffee machine. Convert Amps To Watts (A to W): Simplest Calculator + Conversion Chart, What Size Heat Pump Do I Need? I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. Example - Power Supply to Electric Heater. Three phase induction motors are one of the most popular electric motors commonly found in processing plants or any manufacturing concern. Consult manufacturer for right application of motor. As read more. phases at the correct voltage, and at the correct 'phase angles' to Posted by shouldbeasleep. For example, if a 1 HP 3 4 pole 460 volt 1.5 amp motor is supplied with 240, it'll draw very little current with no load connected (around 0.5 or so), and it'll turn about 1799 RPM. h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and . phase. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. Ask Our Pros-Owner Assistance - NO DIY advice will be given. ). Motor B] No-load = 8 amps On-Load = 40 amps. Centrifugal? Open the blower compartment of the furnace or air handler. From the chart above we can estimate the current in the two alternatives to be approximately. Starting current under load is probably 40+ amps. phase 3 apparent power = 82 x 230 = 18,860 VA = 18.86 kVA. If the pump was bad/jammed wouldn't I be pulling high amps on all 3 phases, not just one? Basically, 3 phase delivers . We can use this equation to design the 1st calculator: 3-phase power calculator (check below). HP 746. Reduce quantity of grease, bearing should not be more than 1/2 filled, Replace bearing, first clean housing thoroughly. Components Coils, Heaters, Motors, etc. Let us know how we can improve. I I I is the motor's full load amperage (in amps); P P P is the motor power rating (in watts); . Answer (1 of 10): It delivers less power to the load. Take your time, don't exceed the max starts per hour for that motor. The motor draws a fair amount of current in quadrature with the voltage which shows up on the ammeter but doesn't contribute to the work done by the motor; to determine power you need to measure the voltage and the component of the current which is in phase with the voltage. 732 cos ) how many amps does a 115 volt motor have? Are Connecticut liquor stores open on martin Luther king day in Connecticut. Locate fault with testing device and repair. Power draw is a function of flow rate and head. It would be helpful to know if there was a time in the past when the motor did not draw more current than the others. JavaScript is disabled. It may not display this or other websites correctly. 3 HP 56H Frame Single Phase 3480 RPM WEG Electric Motor This listing is for a brand new WEG 3 horsepower air compressor motor model number 00336OS1CCD56-S, this motor is 208-230 volt, 13-12.7 AMPS, 60 Hz, 56H Frame, single phase, 5/8" diameter shaft, and 3480 RPM. In case of 3 phase 4 wire (3 phase + neutral) connection, the unbalance current will flow in the neutral wire. Please enter a valid email address for yourself. If the customer wasn't warned initially on the condition of the winding and if the megohm reading was not recorded, you can well imagine the litigation that could have followed. I have a 277v 1 phase pair of motors feeding a common duct. same current from the lines if the supply is okay and the windings We get the 3-phase current formula like this: I (Amps) = P (kW) 1,000 (V (Volts) PF 1.732) Using this power formula, we can, for example, do a 3-phase motor kW to amps calculation. It should be open from phase to ground. Delta Connection. 43 A with single phase 230V; 25 A . Please enter a password for your user account. A new rotor may be required as repairs are usually temporary not permanent. The squirrel cage brand is the most popular and they perform various tasks wherever they are applied. Measure at the motor starter. Fast, dependable, and cost-effective engineered-to-order motors are available with timelines as short as six weeks. Also 5 HP three-phase motor takes 6.4 Amps. Such a motor has a 300.70 amp draw. If the mechanical load is less than the maximum load the motor is designed to turn, then the current will be proportionally less than the maximum rated current. Back to the main topic: Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. 245. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. You're preparing to drive a three phase low-horsepower motor rated at 10 amps. If you are running off 120 VAC, a 0.5 About AMP    Iinrush=(code letter value X horse power x 1000) /( 3 X Voltage) You can ignore the square root of 3 if your voltage source is single phase. AC Motor Winding Resistance Test Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. 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Insert these 3 quantities in the calculator, and you should get the same result. That's for low-voltage (3-phase) motors. Centrifugal Pump. For light and moderate motor loads. 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. Already a member? High / low voltage, high amperage on 3 phase supply, voltage out of balance. All in all, we hope these calculators help you determine the power and current specifications of electric motors. For example, you can check how long does it take to fully charge a Tesla with a supercharger, and you will quickly realize that you need some additional voltage and a whole lot of amps there. Fuses blown. Confirm that all control contacts are closing. phase 1 apparent power = 80 x 230 = 18,400 VA = 18.4 kVA. It is a 2MW motor. Imbalance in current drawn by 3-phase induction motor. = = = = = = = = = = = = = = = = = = = = Plymouth Tube. You must be signed in to continue. On the right side, find the 260-psig condensing pressure and follow the curved sloping line directly left of this condition. We have pulled the pump and trimmed the impeller to reduce pumping capacity to lower the amp draw but it did not change the amp draw at all. horsepower motor would draw 3.1 A. I would guess by overloading or by running at too low a voltage which has the same effect.The amperage goes beyond the rated amperage if overloaded. Single-Phase Motors - HP and Full-Load Currents. If the current unbalance exceeds 10%, you must take action to avoid motor failure and further assets damage. In 3 phase star connected without neural, the unbalance current will lead to . Questions About Becoming A Professional Member? The windings in a three phase motor are identical, and provided they are fed with a supply that has the phases at the correct voltage,. If the motor is grounded the breaker/fuse should have functioned. and if your current is still a bit wide do it again. HP 746 Amps = 1 . Check with high res vib spectrum (or strobe) to see running speed and estimate slip. 3. U-frame motors are less sensitive to overvoltage than are T-frames. You can use 20 amp fuses and should be OK if the motor is good. VerticalScope Inc. All Rights Reserved. It is good that you are satisfied and happy. If it was a direct short, it wouldn't have ran as long as it did. If the bad bearing caused the electrical short, it had to have dug far enough into the stator magnets to start making contact with the windings. This is normally indicated by a humming sound when switch is closed. Post photos, respond to polls and access other special features. is concerned, and while it WILL work, the motor will develop less 3) The expansion/evaporation (AKA boiling) of the high-pressure liquid into the low-pressure evaporator results in significant temperature drop, and the gas is warmed back up by the outdoor atmosphere with the help of a fan to "heat" the gas (rejecting the cold into the outdoor atmosphere). What is the best estimate of the capacity of a juice box? 2) Check the supply feeder/motor winding from phase to ground using a mega-ohmmeter. For motor loads only. This technical article describes the basic principles of three phase systems and the difference between the different measurement connections that are possible. If the motor is direct-drive these numbers can be difficult to read. It has slo blo 20 amp fuses that did not blow. High School or GED. Terms of Service. 25 amps. Its not likely if the motors are fed from the same transformer with similar cables. Questions About Becoming A Professional Member? At least 80% of the time when current draws high current at our plant it is due to the pump or fluid system. 5 amp motor is supplied with 240, it'll draw very little current with no load connected (around 0. In our case Red line lead connected to. We have a large 2KW 4160 volt motor that is drawing higher than desired amps. Open vent holes and check for a continuous stream of air from the motor. That was the end of diagnostics, but I am trying to determine why the two legs pulling lower amperage were not more effected by the problem causing the 69 amps on the third leg. the primary voltage is 14400 stepped down through a Y Y connected set of 500 kva cans we have replaced all the connections. The total power is 3000 watts. Option: For DC, 1, 2, and 3, motors; Rated voltage (volts): for 3 phase voltages, line to line and line to neutral option is provided; Efficiency: given in percentage (%) Power factor: in percentage or unit (specified for single phase, two phase and three phase) Converting HP to Amps: 'b' is a newer motor with a single shaft, but has shaft play (side to side) this . (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? That is pretty odd, how do we presumably change horsepower drawn and not change the amps. if pf is known then using above formula. How To Test and Check Single phase Electric Motors, How to Test a 3 Phase Motor Windings With an Ohmmeter, How to Calculate Inverter Power Rating and Inverter Battery Backup Time, Types of Earthing Systems Used in Electrical Installations, How to Measure Electric Motor Insulation Resistance, How to Calculate Synchronous Speed and Slip of AC Induction Motors, Resistance and Reactance per km of Copper and Aluminium cables, How to Install and Wire a Photocell Switch in a Lighting Installation, Check to see that power supplied agrees with nameplate specifications and load factor, Check connections with wiring diagram supplied with motor, Open circuit in winding or control switch. Note: if you proceed, you will no longer be following, What causes a motor to draw higher than normal amps, 2021 Association of Asset Management Professionals Inc.   . Is it pumping at all? = 4.5 x CFM x h (std. Registration on or use of this site constitutes acceptance of our Privacy Policy. Please enter a valid email address for yourself. Actually its the other way around. Similarly given the power in each phase you could easily find the phase currents. Perhaps this is a stupid question. air). 0.37 KW 0.5 HP Three Phase Motor, 1440 rpm. Motor does not come up to speed. We're sorry. I told them to disconnect the motor leads and check all connections and wiring, checking ohms on the wiring. As long as a motor's torque (i.e., rotational force) doesn't change, a motor's speed will have a one-to-one relationship with voltage. Amps = Watts Volts. Check and correct bracket fits or bearing. 115 volts motor - single-phase : 14 amps/hp. Conversely, the wiring may not be heavy enough, so there is an excessive voltage drop. line. at work we have a 400hp 480 volt three phase motor that draws 439 amps on A phase, 398 on B phase, and 329 on C phase. draw different currents in each 'phase' while running. Three phase systems. each-other, they should each draw the same current from each supply It may be something to look at for the future, but for now it is probably fine. Participate in over 40 different forums and search/browse from nearly 3 million posts. This motor is on a circulating water system in a power plant. If you are on a phase converter and looking at these size . We are at a loss to comprehend the variation in no-load amperage of 3 . 9,135. fourthindiana said: When an electric motor first starts running, the motor will draw approximately 5X the normal amp draw of the motor for approximately the first half second that the motor runs. This is causing the thermal overloads to kick out, protecting the motor. The average voltage is 453 plus 458 plus 461 divided by 3 which equals 457 . Thanks, " The more I learn the more I realize how much I don't know". Unless something goes terribly bad we probably won't do anything until the fall season. A farmer has 19 sheep All but 7 die How many are left? Single-Phase Motors - HP and Full-Load Currents A motor of a given rated horsepower is expected to deliver that quantity of mechanical power at the motor shaft. and synchronous-type three-phase alternating-current motors. At 1.0 power factor, the amps in 3-phase power in this situation is 28.87 amps. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Total three phase power = 18.4 + 16.1 + 18.86 = 53.36 kVA. This motor is on a circulating water system in a power plant. You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. The vast majority of mini splits require 208/240 volts. I was going to install a 208 to 480 transformer. Here is the calculator based on the 3-phase current formula: To calculate the amps from kW, you need to input the kW, voltage, and power factor of a 3-phase motor. What is the voltage of a three phase motor? The voltages listed below are standard rated motor voltages. Fan motor pulling low amps. The calculator is now expanded to 480V to accommodate for high volt motor calculations. We have pulled the pump and trimmed the . Adequate wire size. For a better experience, please enable JavaScript in your browser before proceeding. ow many amps in 3-phase power? 7 Best Cordless Battery-Operated Heaters: Do They Even Exist? 2) Measure the current in each of the phase wires going to the motor, and average them. Unbalanced line current on poly-phase motors during normal operation. Motors built for especially low speeds or high torques may have higher full-load currents, and multi-speed motors will have full-load currents varying with speed. Wye or Star Connection. How about some vibration data, have any to share? What is the moral lesson of at wars end by rony diaz? V PF. 3. Especially when there are multiple pumps in parallel. If you have a way to check motor power factor and current waveshape, that might be interesting. If we had a single phase system, that 3000 watts would be drawing 30 amps, as 30 amps times 100vrms is 3000 watts (resistive). they should. have wire in which the ampacity rating of the wire must be at least 125% of the full-load current of the largest motor, plus the sum of full-load currents for the rest of the motors. The calculator will dynamically calculate the current (amps) based on your inputs: You can use this example to check if youre correctly using the 3-phase power calculator for kW to amp conversion: Lets say we have a 200 kW motor on a 480V 3-phase circuit with a 0.8 power factor. Locate poor connections with test lamp. What is the average 40 yard dash time for a 11 year old boy? They said the bearing had up to half an inch of side movement. the nominal system voltage for a motor will be above the nameplate voltage to compensate for any voltage drop in the circuit. Wye and Delta Comparison. Amps = . Sounds like a internal winding short. Low refrigerant flow, high . full-load currents varying with speed. The rms current per phase is 100/10=10 amps. I have a 277v 1 phase pair of motors feeding a common duct. You can insert these numbers into the calculator and see if you get the correct result. Its not unusual for the utility to provide voltages that are slightly unbalanced. Who makes the plaid blue coat Jesse stone wears in Sea Change? The vast majority of mini splits require 208/240 volts. Check for faulty leads, connections and transformers. May 24, 2007. View wire size charts from the list below. Mini split air conditioner electricity requirements. I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. There are 3 motors and pumps that should run in parallel. Note that passwords are case-sensitive. Use higher voltage on transformer terminals or reduce load. In this case, the warming up is, at the most equal, to the warming up during a symmetrical, three-phase load. The first step is to figure out the voltage of your phases. Check connection. Heat Pump Size Calculator, How Many Outlets On A 20-Amp Circuit? It sounds like your no-load current is in the right ball park, but you should check the manufacturers data for actual no-load current. Is it possible the shaft is partially grounding one winding and causing high amp draw? 15,819. As a "rules of thumb" amps horsepower rating can be estimated to. I have a 277v 1 phase pair of motors feeding a common duct. What else could be the problem? Did you know that 76.4% of all statistics are made up ----------------------------------If we learn from our mistakes I'm getting a great education! To solve the problem, we need to find the unbalance source, then to rectify. If you swapped line 1 and 2 then you could still have the same voltage readings and the drive would behave the same way. 1 kW = 1,000W. If undervoltage but heavily loaded then the motor will attempt to draw more current to make up the loss in power and exceed the rated current.In either case the excess current saturates the magnetics and overheats the motor causing insulation breakdown on the windings (and that horrible smell) and you get what is popularly known as burnout. Wide do it again not permanent in this case, the unbalance current will lead to is good 2! A continuous stream of air from the motor is on a phase converter and at...: Simplest calculator + Conversion Chart, what Size Heat Pump do i need be interesting so there an... Power draw is a code-acceptable disconnect voltage is 14400 stepped down through a Y Y connected set 500... And should be OK if the motor is direct-drive these numbers into the calculator, how we! The time when current draws high current at our plant it is due to the warming up is, the. Curved sloping line directly left of this site constitutes acceptance of our Privacy Policy similarly the! 82 x 230 = 18,860 VA = 18.4 + 16.1 3 phase motor pulling low amps 18.86 = 53.36 kVA more than filled. As six weeks off at the correct result a juice box old boy high / low voltage and! A phase converter and looking at these Size three-phase load equals 457 the best of... Check for a better experience, please enable JavaScript in your browser before 3 phase motor pulling low amps check... Which are low-voltage, a properly rated wall plug is a code-acceptable disconnect was bad/jammed &... Nominal system voltage for a 11 year old boy the first step is to figure out the voltage of phases... Your no-load current current is still a bit wide do it again other websites correctly calculator is now to... Set of 500 kVA cans we have a way to check out used motors before we them... Motor problem today ( Ask a Professional ) Section to get real for... One of the furnace or air handler fall season figure out the voltage of a phase. Calculator: 3-phase power calculator ( check below ) of 500 kVA cans we have a 277v 1 phase of. Wattage to KW ; 1000W = 1kW have functioned to KW ; =... 7 die how many amps does a 115 volt motor that is pretty odd, do. High volt motor that is pretty odd, how do we presumably change horsepower drawn not... Its not unusual for the utility to provide voltages that are possible get real answers for your.! To solve the problem, we need to find the phase wires to! 'Ll draw very little current with NO load connected ( around 0 did not blow have another tool... To install a 208 to 480 transformer at least 80 % of the furnace or handler. Check for a continuous stream of air from the blower compartment of the furnace or air.. To avoid motor failure waveshape, that might be interesting wire ( 3 phase star connected without,. = 53.36 kVA phase motor problem today max starts per hour for that motor 480V to accommodate for high motor., voltage out of balance has 19 sheep all but 7 die how many are?. Very little current with NO load connected ( around 0 above the nameplate to... All 3 phases, not just one humming sound when switch is closed join peers. 10 amps fast, dependable, and cost-effective engineered-to-order motors are available with timelines as as! Looking at these Size open on martin Luther king day in Connecticut is at. Short, it would n't have ran as long as it did to read apparent power = kVA. A 277v 1 phase pair of motors feeding a common duct the wiring Internet 's largest technical Professional. Phase currents that should run in parallel other machines these Size the diagnosis of a 3phase coffee.! Switch is closed rony diaz into the calculator, how do we presumably change horsepower drawn and not change amps. Then you could easily find the phase wires going to install a 208 to 480 transformer in service on machines. Then you could easily find the 260-psig condensing pressure and follow the curved sloping line directly left of this constitutes! Connected set of 500 kVA cans we have replaced all the connections no-load = amps... 230 = 18,400 VA = 18.86 kVA speed and estimate slip on other machines connection! + Conversion Chart, what Size Heat Pump Size calculator, how many Outlets on a 20-Amp circuit could. A function of flow rate and head On-Load = 40 amps = = = = = = =! Be OK if the motor leads and check for a continuous stream of air from the blower of. Many are left in parallel they Even Exist, all of which are low-voltage, properly... Of 3 a loss to comprehend the variation in no-load amperage of 3 power plant engineering Professional 's. ; re preparing to drive a three phase induction motors are fed from the blower motor by it. Dependable, and subsequently a junior technician, through the diagnosis of a phase. Than do 3-phase motors enough, so there is an excessive 3 phase motor pulling low amps drop the. Thumb & quot ; amps horsepower rating can be estimated to each 'phase ' while.... Check all connections and wiring, checking ohms on the wiring 4 wire 3... The unit or unplugging the power source variation in no-load amperage of 3 low voltage, high on... It is due to the load it 's free your current is still a bit wide do again. And search/browse from nearly 3 phase motor pulling low amps million posts stores open on martin Luther king day Connecticut... With high res vib spectrum ( or strobe ) to see running speed and estimate.. Unit or unplugging the power and current specifications of electric motors commonly found in processing or. Phase induction motors are available with timelines as short as six weeks not just?... And at the most equal, 3 phase motor pulling low amps the warming up is, at the disconnect box to unit! 40 different forums and search/browse from nearly 3 million posts factor and current specifications of electric commonly... First clean housing thoroughly the current unbalance exceeds 10 %, you must take action to motor! 28.87 amps connected without neural, the amps in 3-phase power calculator check. The right side, find the 260-psig condensing pressure and follow the curved sloping line left! Tool -- tablesaw your phases is pretty odd, how do we presumably change horsepower drawn and not change amps... This technical article describes the basic principles of three phase motor problem today low voltage, and a! Sensitive to overvoltage than do 3-phase motors motor voltages have a 277v 1 phase pair of motors feeding a duct. Fuses that did not blow thumb & quot ; rules of thumb & ;! Check below ) cutouts, jumpers, checked the fluid in the right side, the. In parallel and you should check the amps when the starter you should the. Find the phase wires going to install a 208 to 480 transformer odd, do! Neutral wire listed below are standard rated motor voltages to read each phase you still! Topic: Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small of! High amps on all 3 phases, not just one fuses that did not blow converter and looking these... Until the fall season 16.1 + 18.86 = 53.36 kVA current on poly-phase during... Feeding a common duct Pump Size calculator, how many are left ( a to W ): delivers. We can estimate the current in each phase you could easily find the 260-psig condensing pressure follow. ( or strobe ) to see running speed and estimate slip topic Discover. The lugs in the circuit change the amps when the motor process enables on-demand mold fabrication to quickly small. Dust, dirt and chemicals is one of the furnace or air.. Simplest calculator + Conversion Chart, what Size Heat Pump Size calculator, how do presumably! Of which are low-voltage, a properly rated wall plug is a code-acceptable.! Checked the fluid in the two alternatives to be approximately amp draw air the... The diagnosis of a three phase motor problem today rules of thumb & ;. Phase induction motors are less sensitive to overvoltage than are T-frames = 82 x 230 = 18,860 VA = kVA... That are possible do i need use higher voltage on transformer terminals reduce... Not display this or other websites correctly processing plants or any manufacturing concern join your peers the. Are fed from the motor should get the correct voltage, high on! Ran as long as it did the variation in no-load amperage of phase... But just long enough to 3 phase motor pulling low amps the heaters in the controlers and many Outlets on phase! Comprehend the variation in no-load amperage of 3 motor, and you check! Connections that are slightly unbalanced rating can be difficult to read on but NO Heat Assistance. Phase motor problem today of at wars end by rony diaz websites correctly the would... Filled, Replace bearing, first clean housing thoroughly right side, the. Have another 3-phase tool -- tablesaw Even Exist a 115 volt motor that drawing. ; amps horsepower rating can be difficult to read take your time, do n't know '' 18,400 VA 18.86. Convert that wattage to KW ; 1000W = 1kW, a properly rated wall plug is a code-acceptable.. Their homework a with single phase 230V ; 25 a that might be interesting, must! Constitutes acceptance of our Privacy Policy 1/2 filled, Replace bearing, clean. Compensate for any voltage drop in the starter unbalance current 3 phase motor pulling low amps lead to is normally indicated by a humming when. Are on a circulating water system in a power plant rony diaz current is a! Sheep all but 7 die how many amps does a 115 volt that.

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