If the environment is reasonably cool, get a fan with ball bearings. Replaced again with .15A fans and alarm went away. One amp drawn by a ceiling fan is equivalent to about 120 watts. 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. If a generic fan throws errors, you should be able to find the exact same fan model online and order a replacement. I would try to get as close to the original current draw as possible. Further increasing the input voltage increases the amperage, increasing the rpm slightly. In fact your wall wart could run up to four fans at once. Amperage used to measure how much load an electrical device draws when in operation. In the attempt to align the fields, the motor produces torque, which gives an impetus to rotate. If the fan is offered for general computer use, you are probably OK. The fan motor description means that at 12VDC the motor will draw. Automotive fans … The sense mechanism (yellow wire), if present can differ from one type of fan to another. According to Home Guides, a ceiling fan uses somewhere between 0.5 and 1 amp. I need to figure how many amps they draw to get the right controller. This means that their power consumption will be determined by the speed the fan is currently operating at, as fan speed follows CPU temperature. I once taught my uni's robotics club some basic electronics, using DC computer case fans and transistors etc. a) 12 & 24V MINI EXTRACTOR FANS: These are small 120mm fans similar to cooling fans on desk top computer cabinets.They use around 6W and are effective within about 1m. Yes, then I would get the same exact fan. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. A fan … That's the one. 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. 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. With a cooling fan, the greater the airflow, the better that fan's ability to cool a radiator. 12V, 0.33A are the voltage and amperage ratings of the fan, it draws 4W (watts). The 0.5 A motor may be a little more powerful at the expense of a slight negligible increase in overall power consumption. So my power hungry smartphone’s charger has an output of 5V @ 1.2 amps, I got a power bank for it that has a matching voltage, but the output is 1 amp, or 2.1 amps. I hooked the ground to the battery. Further increasing the input voltage increases the amperage… That fan is probably a BLDC. Some don't care what fan is attached as long as it can read the RPMs. The main specification of a power supply is in watts. Our DC 5 volt fans are a small investment, but your hardware isn’t. Voltage, amperage, and wattage are all related. Add single unicode (euro symbol) character to font under Xe(La)TeX. Current con sumption on a fan varies from the spec by how much air it is actually moving. Depending on how your computer is configured, it might need enough fans to cool off several different components (e.g. 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. 4.4 out of 5 stars 521. Read on if you’re interested in learning more about these electrical terms and how they work together. Best to assume that you cannot go over the rating. Can PWM affect a brushless DC fan given sufficient time? That is analogous to amperage. Here are the main factors to keep in mind when you're shopping: Dimensions/size. The stated current rating is not to determine cooling performance. Wattage is the measure of power used. I wouldn't go with a higher-draw fan unless you know the mobo can handle it. I took both hot wires and tied them together, as well as the ground wires. I really wish manufacturer's would just use stock adapters and plugs. The few dollars invested in a fan can pay off big by supporting the functionality, reliability, and lifespan of your equipment. Dec 28, 2016 at 14:22 UTC. It's likely it can take a higher wattage fan but I wouldn't risk it unless I knew the specific specs. I measured the current with a multimeter connected in series. Since DC motors are also generators, the reverse voltage raises proportional with the RPM. For the same FOV and f-stop, will total luminous flux increase linearly with sensor area? Sorry if my description isn't 100% accurate. At a fixed voltage, the current draw of the fan determines how much power it uses (volts x amps) … Many thanks. Brushless motors in chassis cooling fans use PWM amplifiers, DC inverters, hall effect sensors, or other positional sensors; to continuously keep the magnetic fields of stator and rotor out of alignment. How would I reliably detect the amount of RAM, including Fast RAM? This topic has been locked by an administrator and is no longer open for commenting. Yes! by To subscribe to this RSS feed, copy and paste this URL into your RSS reader. * Is it cost prohibitive? This explains why the lower voltages are a higher power use, then it hits a sweet spot, most likely the motors most efficient speed. SilverStone Technology 5.25" Display with USB 3.1, Multi Card Reader, Fan Speed, and Voltage/Amperage LCD (FP59B) Fits in any 5.25" external drive bay; Integrated display for monitoring voltage and current; … Making statements based on opinion; back them up with references or personal experience. I would never chance anything like electricity. that depends of the fan. I agree with Robert5205​'s statement - the wiring for the house circuits can handle 15 amps max, so that's what the circuit breakers are protecting. Hi @KyranF and Camil Staps thanks for the advice. At first glance, you may think, “It’s just a fan”. Why is Buddhism a venture of limited few? They are rated to move 2 to 3 cubic metres of air per minute. I suspect you could put a more aggressive or heavier fan blade on the motor and still be within spec. It seems to me that the motherboard would regulate this more than the fan would  I'd still try and make it close, but if anything, I'd error on the lower side. Which of the following retains the information it's storing when the system power is turned off? For example that fan seems to have either 3-phase brushless, or it has a tacometer and something else. Cheers, Tips to stay focused and finish your hobby project, Podcast 292: Goodbye to Flash, we’ll see you in Rust, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…, 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. What should I look for when choosing a computer fan? Remember that the fan is PWM controlled, so the current is not a DC current. Why isn't there a proportionate increase in current with every increase in voltage? A quiet fan will generally use more current to move the same amount of air than a noisier fan will. I wouldn't risk it. A watt is the product of the … The resistance of a motors coils may only be a few ohms while stationary, but while spinning its resistance is proportional to its rpm. Otherwise, choose something really close to the original. That small increase in current will not affect matters. ask a new question. Here are the results: Interesting results. I think I got the wires correct - ie not using PWM and Tacho. if not, see if you can find the specs for the fan online. Don't just replace the circuit breaker with a higher-capacity one though without verifying the wiring in the wall is rated for the breaker you want to install. 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. If the old fan is 12Vdc, your new one should be, too. Asking for help, clarification, or responding to other answers. As an estimate, if the power adapter is rated for 90 watts, divide by voltage (120 volts) to calculate amperage (0.75 Amps). So, if I were to guess, and I am because in the commercial electrical industry we don't use pc fans and the motors we use have very descriptive nameplates as per NEMA (national electrical manufacturers association) I would say that maybe the current rating stated is the starting current. Other designs cause full-speed operation with the control lead dangling. Are there any gambits where I HAVE to decline? Why complicate something so simple. With a fan, it is far more important to have a fan that moves a sufficient amount of air than that draws a specified amount of current. Yes, then then I would look for it on the internet. on Under-voltage, or a heavier load will cause the motor to slow down, a slower rpm means less resistance and increased amperage. As far as I know, the voltage must be the same, but a higher amperage will not cause problems. 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. This statement may be true for most typical applications, but applications that are sensitive to noise and power, this option adds value! The system is already created to run that specified fan. If the laptop needs 1.6 amps but your using a 4 amp adapter, the laptop should only draw 1.6 amps (again, that's for amps, the voltage … Current is the thing that makes components heat up. Also, I think the label represents average current consumption. Wattage, Amperage, and Voltage are all part of the same thing. Maybe you are actually measuring the DC level of the fan? Frequently, as was mentioned above, small fan motors use only a fraction of the rated current, to decrease noise and increase service life. Strong Quiet 12025 Fan 120x120x25mm 12cm 120mm Computer Case Fan DC 12V Cooling Fan for Computer case 2Pin 2 Wire 1600RPM 2-Pack. It only takes a minute to sign up. Power = current x voltage, Current = power/voltage Current will vary based on the workload. That's a tough question in my opinion. Give MCT Denver (http://www.microcomputertechnology.com/index.html) a call. You can be fairly certain that the system was designed to supply the power the fan required. 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. 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. Most chassis fans run on 12v power. ), and that moves as much, or more air. No, then I would get something similar and make it work. Anyway, I supplied the fan with various voltages using my power supply starting from 5V all the way to 12V. They will all … perhaps your multimeter is choking the current to ~50mA Max. 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 3.3- and 5-volts are typically used by digital circuits, while the 12-volt is used to run motors in disk drives and fans. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. You do not want to damage things further by  drawing too much current through a circuit. Motors are inductive loads and work differently than resistant loads. fan setup in my 1970. Amperage . Could be damaged, with a high resistance? MathJax reference. Low settings use less amperage while higher settings use more. The current spec is an average determined by the manufacturer, at a certain voltage, ambient temperature, and no air resistance. Also the ambient temperature is most probably not stable, which leads to fluctuating current measurement results. In fact, after 10V, the current goes up as voltage goes up! 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. I have wired a PC fan to a power supply. … I've used them in the past and they've found fans and power supplies for me. Why was the mail-in ballot rejection rate (seemingly) 100% in two counties in Texas in 2016? Current rating and air movement are not a 1:1 correlation except within the same line of a manufacturer. I used my meter, pictured below, to check amps… 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. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The voltage needs to be the same. If the old fan is 12Vdc, your new one should be, too. Solid-state switching, microprocessor control, PWM, or inveterter modulation control speed and torque, making the current rating printed on the dc fan meaningless in terms of inline DMM current measurement. Can a fluid approach the speed of light according to the equation of continuity? Also was this the NAS mentioned with the fan and the funky looking plug? Amperage is the measure of Current drawn, and voltage … Lo and behold, every single one of them pulled almost exactly 120mA from the bench power supply when given 12V (directly, or when MOSFET used as low side power switch). If it's three or more it's likely controlled using a tacho in which case the exact current draw isn't too critical. After all, it’s just another component to deal with and anything extra adds additional cost to the system. As for brads, if you are lucky enough to find a Nidec or NMB fan, those are the best fans in my experience, but they are hard to find. The fan is 12 volts and my power supply is 12 volts. 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. The important part of any replacement spec is the mounting screw locations and dimensions. Why would hawk moth evolve long tongues for Darwin's Star Orchid when there are other flowers around. Voltage is easy because there's not that much variety in the systems. (Last one unlikely as that still doesn't explain the drop to 40mA.). I'll play around with it a bit more. The faster the motor spins, the more magnetic flux is generated, and the higher the electrical resistance becomes. This causes an equilibrium speed to be reached; the motor's final amperage is equal to input voltage divided by resistance. Thanks for contributing an answer to Electrical Engineering Stack Exchange! What is the physical effect of sifting dry ingredients for a cake? http://www.microcomputertechnology.com/index.html. $14.69 $ 14. Then, find a fan with the equivalent mounting (most fans in computers are common sizes-- example, 70 mm, 80 mm, 120 mm, etc. to me it would all depend on the following: * Is it under warranty? 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. 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. If the line voltage sags to 90 volts, it is … Lastly verify that the current draw (amperage) is either lower or not much higher than the original. It ranges from 4-6 watts so look at how much your fan draws...usually on the sticker.. and if it's below that you should be fine. One of the wires is for PWM control, one is perhaps RPM output, and the other two are power and ground.. play around with it more and see what happens. Are you using a true RMS multimeter? If the fan has an easy path of air flow, it may not draw as much current as expected. Sometimes specs are loose, sometimes not. Are the natural weapon attacks of a druid in Wild Shape magical? In this case, if possible, go with an OEM fan. Go with the same or closest to original specs as you possibly can. Order direct from … Get the same if you can. CPU fan, power supply fan, etc.). Use MathJax to format equations. I would stick with the original brand and model if possible. Also, as Keelan mentioned, it vary very much depending on external measures. If not, and you don't have specs on the original fan, you may end up having to guess what mechanism the sense lead is using. If the wire is 15A rated, you will need to pull new wire rated for 30A. The G1000 Air Data Computer and Attitude Heading Reference System are protected by a 10-amp … More current, more heating. Depending on the size of the fan the type of barrings used in the fan etc. As far as current consumption, as long as you are reasonably close to the original spec you will be fine. Is it illegal to carry someone else's ID or credit card? Is there a general solution to the problem of "sudden unexpected bursts of errors" in software? CFM is the most pertinent factor in cooling performance, and this has 'almost' nothing to do with current rating, except under conditions determined by the manufacturer. I am trying to measure the current of a DC computer cooling fan (Intel E18764-001) at various voltages. Anything in the .4 to .6A range would be fine. IWR Consultancy is an IT service provider. However, such designs will increase current draw to maintain speed as resistance to airflow increases due to dust accumulation, air-filter resistance, or placement with inadequate clearance from walls. A fan with .2A draw will probably not move enough air. You won't hurt anything (in my non-electrical opinion) by adapting the L5-30P to a 15A receptacle - it'll either work or trip the circuit breaker if the load draw is too high. It should provide some information as to the manufacturer, the size of the fan and the direction of airflow. Is this going to cause a … No, then I would try to get the exact same fan. It's going to be 115Vac, 12Vdc, or 5Vdc. The maximum power consumption ratings of CPU and chassis fans … I think this is rather speculative. Follow the manufacturers recommendation for the fan. The fans were 12V, and showed 120mA on the datasheet. I'll have a play around with it a bit more with your advice. It depends on how intelligent the NAS unit is. tpbf 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]. In the event that power is not available to AVN BUS 1, the PFD and cooling fans can get power via an identical circuit breaker on the ESS BUS. ( Use ) 440 ma. For example, an average ceiling fan set on low speed uses … If you send the model number, I can see if we have an exact replacement for you. 69 $17.99 $17.99. Thanks for the clues. The supply ( wall wort ) needs to be able to deliver 440 ma. rev 2020.12.3.38123, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. I have no doubt that your system could supply 1A for the fan without an issue, but that fan would probably sound like a jet engine. Check it out here. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. I am pretty sure that I have done something wrong with the setup but just trying to diagnose it. In most cases, the exact amp usage of a ceiling fan will be known by the fan's … How can I pay respect for a recently deceased team member without seeming intrusive? This explains why the lower voltages are a higher power use, then it hits a sweet spot, most likely the motors most efficient speed. It doesn't need to be an exact match. Charging from the 1 amp … the amperage on the adapter is the maximum current it can produce. It's very frustrating when it's basically a 70-120mm fan that goes in every other computer case but it has a funky end on it... good luck man! Building a source of passive income: How can I start? If additional CFM is needed, an increase in noise and power will also be the result. In this world there is n… My company stocks over 171,000 SKUs of OEM parts. and that it can since it could supply way more current . Here are my questions: Why are the current readings nowhere near the power rating of 0.2A? 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 … A fan with a restricted airflow actually draws less power than a fan with an unrestricted airflow. How can a company reduce my number of shares? I would go with something as close as possible to the original, 12V for sure with the Amps going at 0.4A to a max of 0.6A. the fan on the exhaust is the most important and should be … Amps: Amperes, commonly known as amps, measure the … To continue this discussion, please Used to be a very common occurrence to burn out fan headers on motherboards when people hooked up larger fans to them. Under-voltage, or a heavier load will cause the motor to slow down, a slower rpm means less resistance and increased amperage. LaserValley Technologies is an IT service provider. If you go too low it may not have enough power to keep it cool, or if the fan requires too much then there is a chance that it will not run at all. When compared to other cooling methods, such as air conditioning, ceiling fans use significantly less power. I assume the NAS device is out of warranty and the manufacturer no longer carries parts for it. Its rated specs are: 12V 0.20A. The current draw I would be less concerned about as long as the new fan does not draw more than 25-50% of the original. To learn more, see our tips on writing great answers. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. * Is it still available? The easiest way to determine what fan you need to replace your existing chassis fan is to remove it and check the markings on it. Replacement fan: does current/amps matter? But if this server runs hot or is in a warm environment, a sleeve bearing fan may actually last longer. ), it is using 120 watts of power. Does the replacement fan need to be the exact same amperage or can it be higher or lower? So I am suspecting that this is telling me: "give it 12V and you should get 200mA of current" - Am I right?

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