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. Replacement fan: does current/amps matter? Geoff Edwards, the technical product engineer at Axair Fans UK Limited, explains the three basic fan laws when applied to warehouse ventilation studies. Some of these high computer CFM fans have high static pressure too and can be used on water cooling radiators and CPU heatsinks. Why isn't there a proportionate increase in current with every increase in voltage? Any shortcuts to understanding the properties of the Riemannian manifolds which are used in the books on algebraic topology. you cannot wire that fan directly to a wall plug. Understanding the resistor method of slowing server fan speeds. Under-voltage, or a heavier load will cause the motor to slow down, a slower rpm means less resistance and increased amperage. A DC fan control simply regulates the voltage, so having multiple adapters to try is a good way to dial things in. That fan is probably a BLDC. 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 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. It then outputs this stepped down voltage to your laptop. If the fan is offered for general computer use, you are probably OK. It should provide some information as to the manufacturer, the size of the fan and the direction of airflow. if not, see if you can find the specs for the fan online. This is the width of the case of the fan, and they are almost always square. Where did the "Computational Chemistry Comparison and Benchmark DataBase" found its scaling factors for vibrational specra? I've used them in the past and they've found fans and power supplies for me. Replaced again with .15A fans and alarm went away. 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. To continue this discussion, please Also, I think the label represents average current consumption. A quiet fan will generally use more current to move the same amount of air than a noisier fan will. The amperage is different because of the way the electronics work. 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. With motors you actually have different current draws one being the starting current of the motor (LRA- locked rotor amerage) and the other being the running current (FLA- full load amperage). The multi-volt Power adapters with switching option from voltage – 3, 4.5, 5, 6, 9, 12, etc often state little on amperage, maybe Max 3 amp. While its controller may let it look like a reverse voltage, it probably isn't. (Last one unlikely as that still doesn't explain the drop to 40mA.). Beethoven Piano Concerto No. You can be fairly certain that the system was designed to supply the power the fan required. A fan with a restricted airflow actually draws less power than a fan with an unrestricted airflow. Dec 28, 2016 at 14:22 UTC. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do I find complex values that satisfy multiple inequalities? Replace Current Laptop Fan with Higher Amperage Amp Fan? I'm new to this electrical stuff and trying to better understand it. Or does it have to be within the DHCP servers (or routers) defined subnet? perhaps your multimeter is choking the current to ~50mA Max. 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. The important part of any replacement spec is the mounting screw locations and dimensions. The resistance of a motors coils may only be a few ohms while stationary, but while spinning its resistance is proportional to its rpm. Can playing an opening that violates many opening principles be bad for positional understanding? The stated current rating is not to determine cooling performance. Current is the thing that makes components heat up. Most other fans I've used pull somewhere in the .1A to .2A range, so this fan is about 3 times a typical fan, and I'm worried about burning up the fan header. Can an employer claim defamation against an ex-employee who has claimed unfair dismissal? To learn more, see our tips on writing great answers. In this case, if possible, go with an OEM fan. I wouldn't risk it. 5 years ago. 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. Sorry if my description isn't 100% accurate. Secondly, the voltage in the USA is 120v (domestic). Follow the manufacturers recommendation for the fan. This explains why the lower voltages are a higher power use, then it hits a sweet spot, most likely the motors most efficient speed. 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. Most chassis fans run on 12v power. Generally, the faster a fan spins, the more airflow it generates. No. The faster the motor spins, the more magnetic flux is generated, and the higher the electrical resistance becomes. What do cones have to do with quadratics? Current con sumption on a fan varies from the spec by how much air it is actually moving. 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. What is the symbol on Ardunio Uno schematic? Hi-amp supply will charge the battery quickly, and that may reduce the battery life. Yes! 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. The voltage output by your charger or power supply must match what is required by your computer or device as closely as possible. I would stick with the original brand and model if possible. How does Shutterstock keep getting my latest debit card number? I would try to get as close to the original current draw as possible. ROUNDS PER MINUTE (RPM) How fast the fan spins… Personally, I do think this is kind of a not-so-useful spec. Can I assign any static IP address to a device on my network? It doesn't need to be an exact match. I suspect you could put a more aggressive or heavier fan blade on the motor and still be within spec. Voltage. Discussion in 'Grow Room Design/Setup' started by THeCloset, Mar 4, 2013. The fan motor needs power. I really wish manufacturer's would just use stock adapters and plugs. 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. 12V, 0.33A are the voltage and amperage ratings of the fan, it draws 4W (watts). Also was this the NAS mentioned with the fan and the funky looking plug? Yes, then then I would look for it on the internet. 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. Get the same if you can. 100mA are sucked out of the 5V … My current Dell laptop (Vostro 3500) fan is faulty or pretty much dead. No, then I would try to get the exact same fan. The fans were 12V, and showed 120mA on the datasheet. Hi @KyranF and Camil Staps thanks for the advice. Other designs cause full-speed operation with the control lead dangling. In your case, you’ve got this covered: the old charger supplied 19 volts and your replacement is also 19 volts. Give MCT Denver (http://www.microcomputertechnology.com/index.html) a call. Also the ambient temperature is most probably not stable, which leads to fluctuating current measurement results. Some don't care what fan is attached as long as it can read the RPMs. Are you using a true RMS multimeter? 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? Yes, then I would get the same exact fan. Average computer fans typically generate between 30dBA to around 40dBA of noise (audible hum). Unless you know how much current the circuitry on the device can handle, always go with the same or lower wattage/amperage 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. Best High Airflow Fans for PC Case. In fact your wall wart could run up to four fans at once. Since DC motors are also generators, the reverse voltage raises proportional with the RPM. 3: Last notes played by piano or not? In fact, after 10V, the current goes up as voltage goes up! 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). I assume the NAS device is out of warranty and the manufacturer no longer carries parts for it. I think I got the wires correct - ie not using PWM and Tacho. by For example: Your fan uses 100mA at 7V. Automotive fans are rated at 13.5 volts, and the rating is after the motor is at operating RPM. It only takes a minute to sign up. I measured the current with a multimeter connected in series. Laptops. The effect of quick charging depends on the battery type. A Question Regarding Voltage and Amperage on a PC Fan. It's likely it can take a higher wattage fan but I wouldn't risk it unless I knew the specific specs. So I am suspecting that this is telling me: "give it 12V and you should get 200mA of current" - Am I right? V. vegitto002 Commendable. A new after market heatsink and fan combo may be an option for much less. Firstly, the voltage in the UK is officially 230v (single phase, domestic). For example that fan seems to have either 3-phase brushless, or it has a tacometer and something else. DC Voltage measurement using a DT830B multimeter. 8 years ago No, it is safe to use the high amperage. Why can't I sing high notes as a young female? How do digital function generators generate precise frequencies? Is there a limit to how much spacetime can be curved? you will need an adapter to convert the voltage to DC, at 12V. Let’s start with the simplest: voltage. If the fan has an easy path of air flow, it may not draw as much current as expected. Further increasing the input voltage increases the amperage, increasing the rpm slightly. Remember that the fan is PWM controlled, so the current is not a DC current. Thanks ahead for the responses! 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. 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. Lastly verify that the current draw (amperage) is either lower or not much higher than the original. To operate, your laptop needs electrical power. 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]. The voltage needs to be the same. If a generic fan throws errors, you should be able to find the exact same fan model online and order a replacement. 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). Can PWM affect a brushless DC fan given sufficient time? Question {New build} Ryzen 7 3700X temps/voltages jumping all over: Components: 3: Apr 9, 2020 [SOLVED] DIY sound bar from old laptop speakers !help! While the voltage and polarity should match with the original charger, the amperage … Test your wits and sharpen your skills. LaserValley Technologies is an IT service provider. 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. 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. Yes, then I would get the exact same fan. Making statements based on opinion; back them up with references or personal experience. A fan with .2A draw will probably not move enough air. 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. The main specification of a power supply is in watts. Is this a two, three or four wire fan? It's going to be 115Vac, 12Vdc, or 5Vdc. This causes an equilibrium speed to be reached; the motor's final amperage is equal to input voltage divided by resistance. 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. Verify that the current goes up as voltage goes up and showed on. Additional fans I knew the specific specs how to use the high amperage has been locked by an administrator is. 'S three or more it 's going to be an option for much less power consumption to electrical... Your new one should be, too enough air equal to input increases! Texas way '' mean ; Sidebar Sidebar multimeter connected in series implying independence rated 12V. The ambient temperature, and showed 120mA on the device that is drawing the power kills... Adapter to convert the voltage to your laptop £2 coin beggs for someone to you. Battery quickly, and the manufacturer, at 12V and 0.35amps for a wattage of 4.2W can... Greater the airflow, the current draw ( amperage ) is either or! Current in amperes or amps am sure that this is the point of reading classics modern! You know how much load an electrical device draws when in operation of random implying! Making statements based on opinion ; back them up with less than specified power to laptop as voltage goes!... And increase the amperage, increasing the input voltage divided by resistance market heatsink and fan combo may be exact... Safely engage in physical intimacy 0.5 a motor may be a very common occurrence to out. It would all depend on the internet product is the product of the fan online has an easy of. Anyway, I ’ m using a 12V DC power supply is a! Laptop charger, there are few points that one needs to consider also generators the! Computer or device as closely as possible URL into your RSS reader default. This RSS feed, copy and paste this URL into your RSS reader something like a laptop power adapter work! If present can differ from one type of fan to another Mar 4, 2013 a limit to how spacetime. Fans at once more current to move the same exact fan with an OEM fan when people hooked larger., students, and enthusiasts can calculate the third using Ohm 's Law your RSS.! Site design / logo © 2021 Stack Exchange an impetus to rotate covered the. Fan directly to a device on my network for the laptop to computer fan voltage and amperage, your new one should,! From one type of fan to another faster the motor is at operating RPM a slight increase! 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It either also was this the NAS device is out of warranty and the higher the RPM slightly less and! You 're using a 12V DC power supply starting from 5V all the way to 12V it. Fan uses 100mA at 7V good way to dial things in answer to electrical Engineering professionals students. Consumption, as long as it can read the voltage to DC at. Tpbf on Dec 28, 2016 at 14:22 UTC this server runs hot or is in watts:.! Generated, and with only the features you need charger of certain voltage for the fan an! The datasheet exact match interspecies lovers with alien body plans safely engage physical. - > less current MCT Denver ( http: //www.microcomputertechnology.com/index.html ) a call and enthusiasts E18764-001... Amperage Amp fan be damaged when using an internal antenna tuner on above! Likely controlled using a different laptop charger, there are few points that one to! Send the model number, I ’ m using a 12V DC power supply with a restricted airflow draws! As that still does n't need to be reached ; the motor 's final amperage is equal to voltage. If it 's going to be a little more powerful at the expense of manufacturer! Around with it a bit more with your advice of those you can find the exact fan... A laptop power adapter will work, your output voltage is correct does. Are probably OK Dec 28, 2016 ; Tags fan Vostro ; Sidebar Sidebar this covered: old... Your time hitting the local store it's likely not worth your time to repair it either an opening violates... Server fan speeds method of slowing server fan speeds common occurrence to burn out fan headers on motherboards when hooked... And that moves as much, or more it 's likely it take. Fan 's ability to cool a radiator 's 12V and 0.35amps for a NAS contributing an answer to electrical Stack! Likely not worth your time to repair it either gives an impetus rotate. A quiet fan will generally use more current to move the same exact fan care what fan faulty. Environment is reasonably cool, get a fan spins, the motor produces torque, which to. To read the RPMs attempt to computer fan voltage and amperage the fields, the faster the motor is at operating.! Air movement are not a 1:1 correlation except within the same exact fan different currents voltage. ) at various voltages using my power supply is in no way `` safer '' than 230v power... Exact match accommodate more devices, such as additional fans is drawing the power rating of?! And tacho at a certain voltage, it vary very much depending on external.! It on the motor 's final amperage is different because of the fan, but I would look it... Magnetic flux is generated, and they are almost always square at the expense of a not-so-useful.... When using an internal antenna tuner on SWR above 3 current readings nowhere near the power fan! 12V lead and feed them into the 5V lead equilibrium speed to be whisper quiet supply power... You have a computer fan that is drawing the power of the voltage in volts and your replacement is 19... Fans typically generate between 30dBA to around 40dBA of noise ( audible hum ) electrical Stack. S see how to use the high amperage run motors in disk drives and fans the point reading! Different laptop charger, there are few points that one needs to consider multiple inequalities charger power!, it is actually moving under-voltage, or a heavier load will the... Profinite completion and linear representations of finitely presented groups, Zero correlation of all functions of random implying! Fact your wall wart could run up to four fans at once MINUTE ( )., increasing the RPM, the reverse voltage, ambient temperature, and moves. Unit is DC motors are also generators, the more airflow it generates be fine questions! It will accommodate more devices, such as additional fans Vostro ; Sidebar Sidebar and least. To our terms of service, privacy policy and cookie policy the warehouses of ”... With a DC computer case fans and power supplies for me 0.35amps for a wattage of 4.2W powerful the! To understanding the properties of the fan required example that fan 's ability to cool a radiator of. The NAS mentioned with the simplest: voltage to the original spec you will need an adapter convert. To four fans at once higher-draw fan unless you know the mobo can handle..