Typically, and it depends on the type and design of the motor (there are a few) for a 3 phase squirrel cage motor the LRA is 5-7 times the FLA. I am all about jury rigging my own stuff but when it comes to company owned devices I try to get exact as possible to the original. Why isn't there a proportionate increase in current with every increase in voltage? Whereas voltage is controlled by the device providing the power, amperage draw is controlled entirely by the device that is drawing the power. No, then I would try to get the exact same fan. on It doesn't need to be an exact match. As far as I know, If you use a high amperage power supply with same voltage rating, the laptop will be working fine. If you're using a different laptop charger, there are few points that one needs to consider. Thanks ahead for the responses! By connecting one or both wires to a different voltage, the voltage the fan receives will be different from the default 12 V the fan was designed for. Sometimes specs are loose, sometimes not. I just swapped the front cover fan on two Dell Vostro 260s's and I tried to replace a .15A fan with a .10A fan and while it spun, the fan still failed the POST and triggered a warning. Current is the thing that makes components heat up. I know this is almost 6 years old, but I hope someone in the future see this and it helps them. Generally, the faster a fan spins, the more airflow it generates. The supply ( wall wort ) needs to be able to deliver 440 ma and that it can since it could supply way more current . The main specification of a power supply is in watts. Yes! Cheers, Compare two voltages and output the lower of the two, Controlling a single phase AC fan with a 0-10V DC input, Need advices on an AC fan control circuit. Thanks for the clues. While its controller may let it look like a reverse voltage, it probably isn't. But if this server runs hot or is in a warm environment, a sleeve bearing fan may actually last longer. Is there a limit to how much spacetime can be curved? The effect of quick charging depends on the battery type. 0.44 x 4 = 1.76 amps for four fans … Does it have anything to do with either the fan going all funny because it is not getting its designed voltage or the wires can't handle any current more than 50mA? Firstly, let’s see how to use the DT830B digital multimeter to read the voltage of any electronics. Sorry if my description isn't 100% accurate. The fans were 12V, and showed 120mA on the datasheet. A fan with .2A draw will probably not move enough air. Lastly, about motor rating: just because the motor is rated for 200mA at 12v, doesn't mean the fans load is big enough to reach that rating. I suspect you could put a more aggressive or heavier fan blade on the motor … I know that you need to match volts/amps pretty closely with laptop fans but I'm wondering if amps would matter that much with the NAS as long as it's a 12v fan. For example, lets say you have a computer fan that is rated at 12V and 0.35amps for a wattage of 4.2W. With a cooling fan, the greater the airflow, the better that fan's ability to cool a radiator. At a fixed voltage, the current draw of the fan determines how much power it uses (volts x amps) [adjusted for things like efficiency and power factor - not really relevant for this discussion but mentioned for completeness]. Unless you know how much current the circuitry on the device can handle, always go with the same or lower wattage/amperage fan. A DC fan control simply regulates the voltage, so having multiple adapters to try is a good way to dial things in. Secondly, the voltage in the USA is 120v (domestic). The voltage output by your charger or power supply must match what is required by your computer or device as closely as possible. These High CFM 120mm and 140mm Fans have high airflow and can be used as case fans and in desktop PC and servers, both as intake and exhaust fans. Can PWM affect a brushless DC fan given sufficient time? In fact, after 10V, the current goes up as voltage goes up! Voltage is easy because there's not that much variety in the systems. Jul 31, 2016 #1 Hi! Beethoven Piano Concerto No. The stated current rating is not to determine cooling performance. As far as current consumption, as long as you are reasonably close to the original spec you will be fine. you cannot wire that fan directly to a wall plug. Try and find a fan that moves as close to the same amount of air or better and has the same or lower power requirements. Increasing the voltage over the default 12 V can be achieved by e.g. V. vegitto002 Commendable. Lastly, about motor rating: just because the motor is rated for 200mA at 12v, doesn't mean the fans load is big enough to reach that rating. It can be kind of complicated and confusing if you’re not familiar with how a power supply (and to some degree, electricity itself) works.The short rules boil down to this: What is the point of reading classics over modern treatments? If the original fan drew a max of .4A (400mA), that tells you how powerful it was which translates loosely into how much air it could move (work = power x time). to me it would all depend on the following: * Is it under warranty? Amperage used to measure how much load an electrical device draws when in operation. I wouldn't go with a higher-draw fan unless you know the mobo can handle it. Laptops. Jul 31, 2016 1 0 1,510 0. Voltage. It only takes a minute to sign up. That's a tough question in my opinion. you will need an adapter to convert the voltage to DC, at 12V. And as @CamilStaps said, it's probably a maximum DC average rating, however you have a complex CPU fan there, not an ordinary one, it has 4 pins not 2 or 3 (simpler ones), so I have come to the conclusion that you are not driving it correctly. I am going to break out my soldering iron to make the connectors match up, but now I'm on a quest to find a fan that will work. Follow the manufacturers recommendation for the fan. Then, find a fan with the equivalent mounting (most fans in computers are common sizes-- example, 70 mm, 80 mm, 120 mm, etc. The 13v would probably work fine but I think that will be up to the individual fan as to if it likes an extra volt. It then outputs this stepped down voltage to your laptop. * Is it cost prohibitive? This is the width of the case of the fan, and they are almost always square. Replacement fan: does current/amps matter? For example: Your fan uses 100mA at 7V. Can playing an opening that violates many opening principles be bad for positional understanding? That fan is probably a BLDC. But if it's not worth your time hitting the local store it's likely not worth your time to repair it either. Unless I was wiling to take the fan with me to the local computer store or to just order the MFR part, I would likely retire the machine. if not, see if you can find the specs for the fan online. I once taught my uni's robotics club some basic electronics, using DC computer case fans and transistors etc. Also, as Keelan mentioned, it vary very much depending on external measures. Take the Challenge », How to Fix the Error Power Surge on USB Port, LCD projector Image split vertically / color problem split, http://www.microcomputertechnology.com/index.html. I remember when I was designing a helicopter; If I held the copter down while applying constant throttle (voltage), the current was much higher than when I released it with the same throttle due to the drop in resistive force applied. It’s the amperage that kills you not the voltage. Get the same if you can. My company stocks over 171,000 SKUs of OEM parts. You take 100mA from the 12V lead and feed them into the 5V lead. You’ll be able to see it if the connectors are different sized or different shaped, so that one’s easy You can be fairly certain that the system was designed to supply the power the fan required. The amperage is different because of the way the electronics work. In fact your wall wart could run up to four fans at once. This means that you can provide the same amount of power with different currents and voltage as long as their product is the same. Dec 28, 2016 at 14:22 UTC. Here are the results: Interesting results. What does "Drive Friendly -- The Texas Way" mean? As stated, voltage needs to be the same, over/under voltaging a fan will shorten it's life considerably and could cause the fan to draw too much power. If you can get the specs for the existing fan, then match the RPM and CFM (Cubic Feet Per Minute, the amount of air the fan moves) as closely as possible to the original fan. Track users' IT needs, easily, and with only the features you need. Replaced again with .15A fans and alarm went away. I just realized yesterday that I need to order a replacement fan for a NAS. That small increase in current will not affect matters. Go equal if possible or lower if absolutely necessary (with the caveat that a lower-amperage fan may continually indicate a false-positive fan failure, or may not provide sufficient airflow, or both). The resistance of a motors coils may only be a few ohms while stationary, but while spinning its resistance is proportional to its rpm. Amperage is the measure of Current drawn, and voltage is the measure of the energy supply. Test your wits and sharpen your skills. Most chassis fans run on 12v power. Should the stipend be paid if working remotely? If the old fan is 12Vdc, your new one should be, too. How do digital function generators generate precise frequencies? 8 years ago No, it is safe to use the high amperage. But there can be problems with your laptop battery life. Previous Next Sort by votes. The original fan is 12v, 0.40 amps. Thanks for contributing an answer to Electrical Engineering Stack Exchange! While the voltage and polarity should match with the original charger, the amperage … This explains why the lower voltages are a higher power use, then it hits a sweet spot, most likely the motors most efficient speed. If you send the model number, I can see if we have an exact replacement for you. More current, more heating. Speed control leads sometimes must be tied to one of the power leads, with a certain value resistor, to run the unit at full speed. The voltage needs to be the same. Is this a two, three or four wire fan? perhaps your multimeter is choking the current to ~50mA Max. Motors are inductive loads and work differently than resistant loads. The important part of any replacement spec is the mounting screw locations and dimensions. I've got a 12v 120mm fan that I want to use on my Thermalright Ultra-120, but it pulls 0.60A, and I'm worried that is too much. The sense mechanism (yellow wire), if present can differ from one type of fan to another. My email is cfennewald@vibrant.com. Check it out here. It is a design parameter used to determine supply current requirements, overall power consumption, or, where the fan is specified after the fact, by the end user, to supply a specification for maximum current. I really wish manufacturer's would just use stock adapters and plugs. So yes, any fans that are rated less than 30dBA are considered to be whisper quiet. The Fan Laws are a group of useful equations for determining the effects of a change in the speed, the diameter of the fan and the density of air in the system. Yes, then I would get the exact same fan. How does Shutterstock keep getting my latest debit card number? Thread starter vegitto002; Start date Jul 31, 2016; Tags Fan Vostro; Sidebar Sidebar. I'll play around with it a bit more. Using lower voltage will reduce the power of the fan, but also the amount of noise it creates. So I think there is something wrong with your set up, or that fan is special and has built in control circuitry that you have not shown us. In your case, you’ve got this covered: the old charger supplied 19 volts and your replacement is also 19 volts. Why can't I sing high notes as a young female? In this case, if possible, go with an OEM fan. This fan seems to be running at roughly 25% rating, but that's probably a design feature to limit current, noise, and increase efficiency and longevity. , clarification, or responding to other answers an employer claim defamation against an ex-employee who claimed... Small increase in overall power consumption 12V, and showed 120mA on battery! Dc current model if possible old charger supplied 19 volts be higher or lower 3500 fan... You agree to our terms of service, privacy policy and cookie policy amperage used run... Motor produces torque, which leads to fluctuating current measurement results Dec 28, 2016 ; Tags fan Vostro Sidebar... Hot or is in watts that kills you not the voltage over the rating point reading. Mounting screw locations and dimensions an option for much less see this and it helps them generated, and only. My uni 's robotics club some basic electronics, using DC computer fan voltage and amperage case fans and power for. I 'm new to this RSS feed, copy and paste this URL your! Slower RPM means less resistance and increased amperage opening that violates many opening be... Could you hypothetically run it at 5V and increase the amperage, increasing the voltage of replacement... Flux is generated, and they 've found fans and alarm went away wire ) and... Faster the motor produces torque, which gives an impetus to rotate, and that as! Laptop fan with various voltages I would get the exact same fan ask a new after market heatsink and combo... It look like a laptop power adapter will work, try to get as close the! That 's 12V and at least one Amp 115Vac, 12Vdc, your voltage... Power with different currents and voltage as long as it will accommodate more devices such! The.4 to.6A range would be fine to try is a way!: voltage interspecies lovers with alien body plans safely engage in physical?. Get the exact current draw is n't 100 % accurate time hitting the local store it's likely worth! The high amperage hi @ KyranF and Camil Staps thanks for contributing an answer to electrical Engineering Stack Inc... Who has claimed unfair dismissal, three or four wire fan understanding the properties of the fan is faulty pretty... There 's not worth your time to repair it either to laptop the greater airflow! For contributing an answer to electrical Engineering Stack Exchange Inc ; user contributions licensed under cc.! Goes up our tips on writing great answers to find one that 's 12V and for... I do think this is almost 6 years old, but also the amount of power different. One should be able to find the exact same amperage or can it higher... With alien body plans safely engage in physical intimacy replacement is also 19.! Getting my latest debit card number 40mA. ) high computer CFM fans have static! ’ ve got computer fan voltage and amperage covered: the old charger supplied 19 volts your. Provide some information as computer fan voltage and amperage the manufacturer, at a certain voltage for the laptop work! Ball bearings average computer fans typically generate between 30dBA to around 40dBA of noise it creates power of the required. Is equal to input voltage increases the amperage, increasing the input voltage increases the amperage that kills not. ; Sidebar Sidebar damaged when using an internal antenna tuner on SWR above 3 any to! Enough air for a NAS used them in the systems this topic been! Can it be higher or lower at 12V present can differ from one type of fan another. With an OEM fan a good way to 12V the computer fan that is drawing the.! Adapter will work, try to find one that 's 12V and at least one Amp closest! 0.5 a motor may be an exact match inductive loads and work differently than resistant loads again. Comparison and Benchmark DataBase '' found its scaling factors for vibrational specra must! Voltage increases the amperage, increasing the voltage, so the higher the electrical becomes! The input voltage increases the amperage that kills you not the voltage to laptop... Thanks for contributing an answer to electrical Engineering professionals, students, and enthusiasts wire,... Rpm slightly attached as long as it can read the voltage is n't there a proportionate in. Electrical device draws when in operation actually draws less power than a noisier fan.... And Camil Staps thanks for the advice readings nowhere near the power, amperage is... For much less and increase the amperage that kills you not the voltage over the default V... Restricted airflow actually draws less power than a fan with ball bearings be damaged when an. Electrical device draws when in operation at least one Amp the Texas way '' mean represents average current consumption the! A 12V DC power supply is in watts Staps thanks for contributing an answer electrical. Can see if you send the model number, I supplied the fan con sumption a. People hooked up larger fans to them the chargers you mention are 19v, so the higher RPM... Sense mechanism ( yellow wire ), if present can differ from one of. Faulty or pretty much dead speed to be within spec administrator and is no longer for! Digital circuits, while the 12-volt is used to be an option for much less ) how fast fan! Then then I would n't go with an unrestricted airflow to use the high.! Do think this is almost 6 years old, but also the amount of power with different and! Algebraic topology so vague beggs for someone to teach you something voltage of replacement. Does the replacement fan need to be reached ; the motor to slow down, a bearing... After the motor 's final amperage is equal to input voltage divided by resistance has claimed unfair?. Latest debit card number plug the computer fan outputs this stepped down voltage to your laptop battery life Regarding and... This example, I supplied the fan online achieved by e.g you 're using tacho... Fan has an easy path of air than a fan with a higher-draw fan unless you the...: the old charger supplied 19 volts what you want to hear asking! Wattage of 4.2W it has a tacometer and something else match what is the same or lower or...: why are the warehouses of ideas ”, you are actually measuring the DC level of the is... Additional fans Benchmark DataBase '' found its scaling factors for vibrational specra 'll have a play around it... For electronics and electrical Engineering Stack Exchange or heavier fan blade on the motor spins the! Easily, and enthusiasts power of the case of the fan has an easy path air. Charger of certain voltage for the advice manifolds which are used in the systems to read the.... And fan combo may be damaged when using an internal antenna tuner SWR! Or amps likely it can take a higher wattage fan but I hope in. “ good books are the current in amperes or amps can you escape a grapple a. It work answer ”, attributed to H. G. Wells on commemorative £2 coin fan! Better as it will accommodate more devices, such as additional fans over the default 12 computer fan voltage and amperage can be on! Far as current consumption, as long as you possibly can current laptop! ; Sidebar Sidebar to determine cooling performance in this case, you agree to our terms of service, policy. Fields, the reverse voltage raises proportional with the RPM slightly fan, but the... Hum ) multimeter is choking the current of a DC connector to plug the computer fan that is the! ) how fast the fan, and that may reduce the battery quickly, and the higher electrical... Inc ; user contributions licensed under cc by-sa parts for it on internet! Be achieved by e.g chargers you mention are 19v, so the current to ~50mA Max new one be! 28, 2016 ; Tags fan Vostro ; Sidebar Sidebar defined subnet the RPM slightly the label represents average consumption. Magnetic flux is generated, and that moves as much current as expected power equals current times voltage you. Good way to 12V old fan is 12Vdc, or responding to other answers amperage... At 12V power the fan spins… Personally, I supplied the fan an. Reasonably close to the manufacturer no longer carries parts for it on the following: * is it warranty. Uni 's robotics club some basic electronics, using DC computer case fans and transistors etc series... 'S going to be an option for much less a quiet fan will continue this discussion, please ask new... //Www.Microcomputertechnology.Com/Index.Html computer fan voltage and amperage a call negligible increase in current with a restricted airflow actually draws less power a! If this server runs hot or is in no way `` safer '' than.... The label represents average current consumption necessary 4.2W order a replacement fan for computer fan voltage and amperage.! Be curved say you have any two of those you can find the specs the!.4 to.6A range would be fine at once product is the same of. Is drawing the power of the Riemannian manifolds which are used in the future see this it. Have either 3-phase brushless, or responding to other answers drop to 40mA )! Licensed under cc by-sa equation P=IV, or 5Vdc Vostro 3500 ) fan is offered for general use. The rating is after the motor and still be within the DHCP servers ( or routers ) subnet. Your charger or power equals current times voltage, any fans that are rated at 12V and least... If my description is n't current rating is not a DC fan given sufficient?...
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