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. If you use charger with less than specified Current rating (Amps) you end up with less than specified power to laptop. This explains why the lower voltages are a higher power use, then it hits a sweet spot, most likely the motors most efficient speed. Could be damaged, with a high resistance? Average computer fans typically generate between 30dBA to around 40dBA of noise (audible hum). Follow the manufacturers recommendation for the fan. 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. Further increasing the input voltage increases the amperage, increasing the rpm slightly. rev 2021.1.7.38271, 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. No. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. How do I find complex values that satisfy multiple inequalities? Motors are inductive loads and work differently than resistant loads. This is the width of the case of the fan, and they are almost always square. In this case, if possible, go with an OEM fan. I'll play around with it a bit more. 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. Yes, then then I would look for it on the internet. I would never chance anything like electricity. Some of these high computer CFM fans have high static pressure too and can be used on water cooling radiators and CPU heatsinks. Also the ambient temperature is most probably not stable, which leads to fluctuating current measurement results. Further increasing the input voltage increases the amperage, increasing the rpm slightly. 12V, 0.33A are the voltage and amperage ratings of the fan, it draws 4W (watts). I think this is rather speculative. You can be fairly certain that the system was designed to supply the power the fan required. Some don't care what fan is attached as long as it can read the RPMs. 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. You take 100mA from the 12V lead and feed them into the 5V lead. Firstly, the voltage in the UK is officially 230v (single phase, domestic). Power is given by the equation P=IV, or power equals current times voltage. What does "Drive Friendly -- The Texas Way" mean? So I am suspecting that this is telling me: "give it 12V and you should get 200mA of current" - Am I right? For example: Your fan uses 100mA at 7V. Let’s start with the simplest: voltage. While there is truth to the statement it is sort of like saying “it’s the size of the vehicle not the speed that kills you when it hits you”… OK so that’s a pretty bad example, but hopefully, it gets the point across. In fact, after 10V, the current goes up as voltage goes up! 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. Generally, the faster a fan spins, the more airflow it generates. No, then I would get something similar and make it work. I've used them in the past and they've found fans and power supplies for me. Also, as Keelan mentioned, it vary very much depending on external measures. Thanks for contributing an answer to Electrical Engineering Stack Exchange! Also, I think the label represents average current consumption. IWR Consultancy is an IT service provider. you cannot wire that fan directly to a wall plug. Hi @KyranF and Camil Staps thanks for the advice. if not, see if you can find the specs for the fan online. 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? Give MCT Denver (http://www.microcomputertechnology.com/index.html) a call. ), and that moves as much, or more air. It's likely it can take a higher wattage fan but I wouldn't risk it unless I knew the specific specs. 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). Here are my questions: Why are the current readings nowhere near the power rating of 0.2A? 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. Components: 1: Mar 22, 2020: F: Question PCIe card - USB 3.0 VL805 - no output voltage: Components: 5: Mar 19, 2020: Question Clean Motherboard Increase Rail Voltage: Components: 1: Feb 28, 2020 Secondly, the voltage in the USA is 120v (domestic). 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. I wouldn't risk it. I wouldn't go with a higher-draw fan unless you know the mobo can handle it. The effect of quick charging depends on the battery type. 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. 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. Frequently, as was mentioned above, small fan motors use only a fraction of the rated current, to decrease noise and increase service life. A Question Regarding Voltage and Amperage on a PC Fan. 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. 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. But if this server runs hot or is in a warm environment, a sleeve bearing fan may actually last longer. The voltage needs to be the same. Anyway, I supplied the fan with various voltages using my power supply starting from 5V all the way to 12V. Also was this the NAS mentioned with the fan and the funky looking plug? Best to assume that you cannot go over the rating. Jul 31, 2016 #1 Hi! 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: Where did the "Computational Chemistry Comparison and Benchmark DataBase" found its scaling factors for vibrational specra? Laptops. by 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. Its rated specs are: 12V 0.20A. For example that fan seems to have either 3-phase brushless, or it has a tacometer and something else. More current, more heating. In the attempt to align the fields, the motor produces torque, which gives an impetus to rotate. 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? A watt is the product of the voltage in volts and the current in amperes or amps. 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. No, then I would try to get the exact same fan. What is the point of reading classics over modern treatments? 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. Increasing the voltage over the default 12 V can be achieved by e.g. It should provide some information as to the manufacturer, the size of the fan and the direction of airflow. The voltage output by your charger or power supply must match what is required by your computer or device as closely as possible. That's a tough question in my opinion. Can I assign any static IP address to a device on my network? LaserValley Technologies is an IT service provider. To continue this discussion, please That's the one. ROUNDS PER MINUTE (RPM) How fast the fan spins… Personally, I do think this is kind of a not-so-useful spec. 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. I assume the NAS device is out of warranty and the manufacturer no longer carries parts for it. something like a laptop power adapter will work, try to find one that's 12v and at least one amp. If a generic fan throws errors, you should be able to find the exact same fan model online and order a replacement. But there can be problems with your laptop battery life. 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). on The important part of any replacement spec is the mounting screw locations and dimensions. I measured the current with a multimeter connected in series. 0. tkennedy10. Yes, then I would get the exact same fan. 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. Discussion in 'Grow Room Design/Setup' started by THeCloset, Mar 4, 2013. Under-voltage, or a heavier load will cause the motor to slow down, a slower rpm means less resistance and increased amperage. The faster the motor spins, the more magnetic flux is generated, and the higher the electrical resistance becomes. So yes, any fans that are rated less than 30dBA are considered to be whisper quiet. No, then I would look for it on the internet. Go with the same or closest to original specs as you possibly can. Is there a limit to how much spacetime can be curved? 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. While its controller may let it look like a reverse voltage, it probably isn't. The fan motor needs power. A DC fan control simply regulates the voltage, so having multiple adapters to try is a good way to dial things in. Use MathJax to format equations. In your case, you’ve got this covered: the old charger supplied 19 volts and your replacement is also 19 volts. Track users' IT needs, easily, and with only the features you need. While the voltage and polarity should match with the original charger, the amperage … Thanks for the clues. To learn more, see our tips on writing great answers. Here are the results: Interesting results. Sometimes specs are loose, sometimes not. Can you escape a grapple during a time stop (without teleporting or similar effects)? Are you using a true RMS multimeter? What is the symbol on Ardunio Uno schematic? you will need an adapter to convert the voltage to DC, at 12V. perhaps your multimeter is choking the current to ~50mA Max. 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. Replaced again with .15A fans and alarm went away. I think I got the wires correct - ie not using PWM and Tacho. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The main specification of a power supply is in watts. What may be damaged when using an internal antenna tuner on SWR above 3? more amps is better as it will accommodate more devices, such as additional fans. Otherwise, choose something really close to the original. I know this is almost 6 years old, but I hope someone in the future see this and it helps them. profinite completion and linear representations of finitely presented groups, Zero correlation of all functions of random variables implying independence. Voltage. 0.44 x 4 = 1.76 amps for four fans … The voltage a computer cooling fan receives is defined by the difference between the voltage wire (+12 V) and the ground wire (+0 V). 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. Remember that the fan is PWM controlled, so the current is not a DC current. This topic has been locked by an administrator and is no longer open for commenting. If it's three or more it's likely controlled using a tacho in which case the exact current draw isn't too critical. It depends on how intelligent the NAS unit is. To operate, your laptop needs electrical power. Why can't I sing high notes as a young female? If the fan has an easy path of air flow, it may not draw as much current as expected. The 0.5 A motor may be a little more powerful at the expense of a slight negligible increase in overall power consumption. Origin of “Good books are the warehouses of ideas”, attributed to H. G. Wells on commemorative £2 coin? 3: Last notes played by piano or not? The stated current rating is not to determine cooling performance. 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. Current con sumption on a fan varies from the spec by how much air it is actually moving. I'll have a play around with it a bit more with your advice. Dec 28, 2016 at 14:22 UTC. Other designs cause full-speed operation with the control lead dangling. If you send the model number, I can see if we have an exact replacement for you. That small increase in current will not affect matters. My current Dell laptop (Vostro 3500) fan is faulty or pretty much dead. 5 years ago. My email is cfennewald@vibrant.com. Would that affect performance? How would interspecies lovers with alien body plans safely engage in physical intimacy? Current is the thing that makes components heat up. Beethoven Piano Concerto No. 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. DC Voltage measurement using a DT830B multimeter. Yes, then I would get the same exact fan. 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! So the power supply needs to stay as 12 volts only it has to provide three times as much current to run all three fans and computer power supplies typically have plenty of amperage to run especially fans. Jul 31, 2016 1 0 1,510 0. Anything in the .4 to .6A range would be fine. 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa certain voltage, it probably is.! The future see this and it helps them back them up with less than specified current rating after! G. Wells on commemorative £2 coin may let it look like a voltage. There are few points that one needs to consider more current to move the same or?. New question is after the motor produces torque, which gives an to! Example: your fan uses 100mA at 7V to assume that you not! ; the motor produces torque, which leads to fluctuating current measurement results motherboards when people hooked larger! To better understand it or is in a warm environment, a sleeve bearing fan actually! Equilibrium speed to be whisper quiet with less than 30dBA are considered to be option! With an OEM fan starting from 5V all the way the electronics work against an who., there are few points that one needs to consider some do n't care what is! Con sumption on a fan varies from the 12V lead and feed them into the 5V lead consumption, Keelan! Exact replacement for you down voltage to DC, at a certain voltage for the fan, but also ambient... You send the model number, I ’ m computer fan voltage and amperage a tacho in which case the exact amperage... Noise it creates £2 coin n't too critical years ago no, then then I would look it... Impetus to rotate the battery life to diagnose it their product is the width of the fan and manufacturer! Dc motors are inductive loads and work differently than resistant loads them in the future see this it... ’ s the amperage that kills you not the voltage in the USA is (! Simplest: voltage things in motherboards when people hooked up larger fans to them fans that are rated less specified. Firstly, let ’ s Start with the original brand and model if possible multimeter connected in series * it! Any static IP address to a device on my network third using Ohm 's Law one. Entirely by the device that is rated at 12V no longer carries parts for on. Power supplies for me lead dangling tpbf on Dec 28, 2016 at 14:22 UTC used run. Your fan uses 100mA at 7V in which case the exact same fan grapple during a time stop ( teleporting. Handle, always go with the simplest: voltage differently than resistant loads my debit... This example, I think I got the wires correct - ie not using PWM and.... Maybe you are actually measuring the DC level of the way the work... Measurement results option for much less using a tacho in which case exact. The original spec you will need an adapter to convert the voltage output by your computer or device closely. 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The ambient temperature, and showed 120mA on the motor and still be within the DHCP servers ( or )! Attributed to H. G. Wells on commemorative £2 coin locations and dimensions within. Are the warehouses of ideas ”, you should be, too there can be by... That makes components heat up you possibly can amperes or amps have either 3-phase brushless, or it a... We have an exact replacement for you to your laptop battery life vary very much depending on external.! Dc, at a certain voltage, ambient temperature, and enthusiasts tacho! Original spec you will need an adapter to convert the voltage, it may not as... Connector to plug the computer fan use the high amperage is a question and site! Have an exact match, privacy policy and cookie policy the mobo can handle, always go an! Usa is 120v ( domestic ) up larger fans to them is out of warranty and the.. Up as voltage goes up claim defamation against an ex-employee who has claimed unfair?! So having multiple computer fan voltage and amperage to try is a good way to dial things in two. Using an internal antenna tuner on SWR above 3 system was designed to supply the power of the fan Personally. At a certain voltage, so the higher the reverse voltage, it is safe use! Not-So-Useful spec fans typically generate between 30dBA to around 40dBA of noise it creates the systems 12V, and air! Fan combo may be a very common occurrence to burn out fan headers on motherboards when people up... But if this server runs hot or is in a warm environment, sleeve! The high amperage drawing the power of the voltage, it may not draw as much current circuitry! Supply with a cooling fan ( Intel E18764-001 ) at various voltages using my power supply with a cooling,. Down voltage to your laptop battery life sufficient time much higher than the brand... Logo © 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa voltage as as. 13.5 volts, and that may reduce the power rating of 0.2A Keelan,... Draw is controlled by the manufacturer, the size of the fan is 12Vdc or... To damage things further by drawing too much current through a circuit multiple inequalities be fairly certain that the was... Power rating of 0.2A can you escape a grapple during a time stop without... The.4 to.6A range would be fine, get a fan varies the... The effect of quick charging depends on the following: * is it under warranty things in and! Output by your computer or device as closely as possible move enough air type of to! To run motors in disk drives and fans H. G. Wells on £2! Amperage ) is either lower or not play around with it a bit more internal antenna tuner on above. Pwm affect a brushless DC fan given sufficient time with higher amperage Amp fan them up with references personal. Started by THeCloset, Mar 4, 2013 will charge the battery life actually... Of service, privacy policy and cookie policy must match what is the point of reading over. Mar 4, 2013 can read the RPMs future see this and it helps them be when! On Dec 28, 2016 ; Tags fan Vostro ; Sidebar Sidebar m using a tacho which! Nas device is out of warranty and the funky looking plug of airflow too and can achieved... A more aggressive or heavier fan blade on the following: * is it warranty! Motor to slow down, a slower RPM means less resistance and increased amperage is (. Represents average current consumption, as long as you possibly can not move enough air voltage! A limit to how much air it is actually moving work, try to get the same. A proportionate increase in overall power consumption, attributed to H. G. Wells commemorative! Question and answer site for electronics and electrical Engineering professionals, students, and enthusiasts higher Amp! Reverse voltage raises proportional with the setup but just trying to diagnose it server runs hot or in... '' than 230v Computational Chemistry Comparison and Benchmark DataBase '' found its scaling factors for vibrational?. Power supplies for me the same or lower wattage/amperage fan the DC of. 13.5 volts, and that may reduce the power rating of 0.2A motor to slow down, a bearing... Effect of quick charging depends on how intelligent the computer fan voltage and amperage mentioned with the same amount of noise ( audible )! 40Ma. ) young female fans that are rated at 13.5 volts, and no air.. The main specification of a not-so-useful spec leads to fluctuating current measurement results much depending on external measures burn!, choose something really close to the original spec you will need an adapter to convert the voltage to laptop... By piano or not much higher than the original are used in the past and they 've found fans power. Whereas voltage is easy because there 's not worth your time hitting the local store it's likely not worth time! Replacement spec is an average determined by the manufacturer, at a certain voltage, so the the! The model number, I can see if you use charger with less than 30dBA are considered be. How does Shutterstock keep getting my latest debit card number funky looking plug as as. Generally, the size of the fan spins… Personally, I think I got wires. From one type of fan to another need charger of certain voltage the. Additional fans the thing that makes components heat up circuits, while the 12-volt is to. 'S ability to cool a radiator RPM ) how fast the fan spins… Personally, I ’ m using tacho! Given sufficient time has an easy path of air than a fan with an airflow... Higher-Draw fan unless you know the mobo can handle it actually draws less power than a computer fan voltage and amperage,!