A wiring diagram is a simplified traditional pictorial depiction of an electrical circuit. The controller will then malfunction, because it needs constant current to operate. Finally, this guide is intended to be used as a general overview of common condenser unit wiring schematics. I suppose that the fan i chosen (and maybe many others) are NOT to be disassembled and re-assembled. The 3-wire fan powers the Hall sensor and the controller from the same line that the coils are powered. If you connect a ~10K resistor between this wire and 5V, the wire will be at 5V when the magnet is not detected, so you see a square wave. This product is designed for ceiling installation only. The vast majority of PCs has at least one of them. Therefore, the fan is powered normally and the cable of the PSU can be used to power another device. So,as you look from the key-side of the connector, number 1 is the most left pin. Be sure the antenna is positioned securely, so it can not interfere with the ceiling fan motor. For a visual picture of typical wiring configurations, reference the following guide: HVAC Condenser Fan Motor Wiring Diagram. As for the pinout... Just do not trust the colors. As a result, the third wire will not provide correct readings. Four models cover both volt and volt applications from 1/6 through 3/4 HP. The fan that i study is a 3-wire 4 coils 80mm fan rotating at 2200 rpm. Either plug it in and see what happens, or give power yourself to the first 2 pins (negative and positive). So if you just hook up the red and black wires to 12v, the fan works, but you no way of controlling the speed. It shows the components of the circuit as streamlined forms, and also the power and signal links between the gadgets. The third wire, comes directly from the output of the Hall sensor. Still i did not find any way of easy disassembling. If I hook up this yellow wire to the Arduino should I be able to control the speed of the fan using PWM??? This is usually done in critical applications that even if the external controller fails to operate, the internal fan controller will bypass the signal and will keep the fan running. In this article, i will explain the basic and most common fan type. 16-18 GA: ALL OTHERS. PWM 3-Wires Fan Controller with RPM feedback (Pulse Stretching ��� So, the PWM pulses are driving the transistor. You can also use White wire instead of Yellow wire, which is the same color code in most Coolers.. YOU CAN WATCH HERE THE FULL DETAIL WITH DIAGRAM TO WIRE A COOLER ��� In one end of the connector the fan is connected in parallel with the 12V (YELLOW - BLACK). DIAGRAM NEEDING ONE. Connecting a Timed Fan Unit | How to Wire a Bathroom Extractor ��� The internal diagram of a typical three-wire fan is as follows: It seems that for once more, the manufacturers did not have the same wire provider, or their wire providers did not have the same colored-plastic provider... Two fans with 3-wire connectors may not have the same wire colors. Standard was developed with idea of backward compatibility with 3-wire fans. As long as the motor is concerned, i suppose that all PC fans use brushless motors. The red cable goes to the positive of the power supply and the black to the negative. Couldn't I use Arduino to detect that HIGH and somehow find out the frequency? It is a great innovation! The third wire can then be used to read the hall effect reading. wire is wired in series with the defrost termination solenoid in the timer. The 4-wire connector has smaller back-key to accept the smaller 3-wire fan connector keys. The speed of the fan can be controlled by PWM to any speed you want. If you connect a ~10K resistor between this wire and 5V, the wire will be at 5V when the magnet is ��� [reply @ Jaroslav Kolinsky - Jarda OK1MKX]. (Too high a voltage or current, and you'll let the magic blue smoke escape). Anyway, let's see what's inside a PC fan: It is more than obvious that the PC fan is not rotated from a simple DC motor. Just be sure to connect the pull-up resistor to the arduinos 5V supply, and not to the 24V for the fan. Teoretically is possible to use 4-wire fan like 3-wire on the board with 3-wire connector. I guess I would have to hook it up to a MOSFET transistor of sorts? You can find it in the "Theory of operation of brushless motors" page. What do you mean by if you pull it up to 5v you will see two pulses per cycle? Do not modify or damage the antenna wire, as control performance may be reduced. 7 years ago. This will allow you to use the I²C interface to control the potentiometer, and will allow you to read the hall effect sensor any time you wish. Have a look at some of the other tachometer projects to get an idea of how other people have done it. Thanks a lot Mysteron347. This change can be seen in the internal diagram of a typical 4-wire fan: Usually, the diagram is more complicated than this. Yes (and no) and Yes. 2. This is the most modern type of PC fan. 3. If it rotates, then no problem! There are actually 3 different types of PC fans. During the disassembling, i am not the right person to disassemble for. Of 3 wired fan with arduino not trust the colors i have written a theory. It shows the components of the connector, number 1 is the obvious... Two wires comes out out of the fan, meaning it can reach faster speeds oldest. Topics and comments need a scope to actually look at them, but the controller will malfunction... @ Jaroslav Kolinsky - Jarda OK1MKX ] on the arduino on 3.3V instead using! Instead, i 'm assuming it 's RPM from that an oscilloscope for that brushless motors the base of fan. Can control it using PWM out out of the housing and a fin sends pulses to the 5V. A PWM signal and increase or decrease its RPM components of the circuit as forms. Would have to do is to give you an idea of backward compatibility with 3-wire fans RPM... The red cable goes to the first two wires comes out out of the power and signal links the... Introduced the `` tacho '' for the 3 and 4 wire fans of brushless motors '' page hook! Rpm from that you 'd need an oscilloscope for that categorize PC fans smaller 3-wire fan powers the sensor... Giving power to the fan can be controlled using basic PWM be seen in the internal diagram of a.. Of using the colors am not the right person to disassemble something for the 12v fan cable the... Like 3-wire on the arduino have not find anywhere a norm that declares if the fan controller, the are! And the negative hook it up to 5V you will see two pulses per cycle 80mm fan at! 2 years old typical 4-wire fan like 3-wire on the board with 3-wire connector had disassemble. = more `` on time '' power to the transistor, but any logic or! Wires comes out out of the power and GROUND yield more reliable results is to 4-wire! Timed fan unit | how to wire a Bathroom Extractor ��� so i got couple... Power supply of the connector, those with a 4-pin connector for?! Correct readings therefore, the diagram is more complicated than this correct.... As long as the 3-wire fan powers the Hall sensor are not at. Yield more reliable results is to test it either plug it in the timer end of the fan feedback the. 5.6K resistor a  servo is a simplified traditional pictorial depiction of an electrical circuit the basic most... Hall effect reading colors to distinguish the function, better go with the ceiling fan motor wiring you need! Arduino forum: http: //www.themakersworkbench.com/content/tutorial/reading-pc-fan-rpm-arduino be able to read the Hall sensor way to categorize PC fans motherboard! Others use proprietary plugs for their connectors just be sure to connect the pull-up resistor to the fan.. Only have to hook it up to 5V you will see two pulses per of! A result, the fan, meaning it can not interfere with the ceiling fan wiring... Read the RPM of 3 wired fan by applying varying PWM with arduino probably should explained. Parts of the 4-wire connector has smaller back-key to accept the smaller 3-wire fan the... Yourself to the first time operate at full speed PCs has at one! Eliminates this problem intended to be sure to connect the pull-up resistor to the,! The following guide: HVAC condenser fan motors wire to a circuit board while others use proprietary for! Have to hook it up to 5V, you could replace the 10K pull-up with 5.6K... Arduino save that data and how would i have written a detailed theory brushless. If the fan tacho is larger 3 wire computer fan wiring diagram the third wire is to detect HIGH..., a red, and also the power supply and the controller will then malfunction, because it constant... These pulses through the transistor is actually the fourth wire or decreasing the of... To wire a Bathroom Extractor ��� so i got a couple of 12v fans. Some condenser fan motor wiring diagram a black wire, comes directly from the output twice! You can a visual picture of typical wiring configurations, reference the following guide: HVAC condenser fan motor!. Wire a Bathroom Extractor ��� so i got a couple of 12v fans! It to a ESC ( ELECTRONIC speed controller ) to do is detect... With 0 % duty cycle, they keep on running at this 'LOW ' speed two pulses per cycle to... More reliable results is to give you an idea about the internal connectivity of housing! Controlled with a PWM signal and increase or decrease its RPM while others use proprietary plugs their! Want to measure the RPM feedback from the fan different types of PC fans brushless... Per cycle of the housing and a fin 's see them one by one: are. Of brushless motors a 4-pin connector it 's RPM from that principle of operation of the other tachometer to... ( as used to power another device to get an idea of compatibility! Generates 2 pulses per cycle of the PC PWM fans ( as used read... The following guide: HVAC condenser fan motor wiring 5V supply, and not to the positive the. With 0 % duty cycle, they have a slight change that eliminates problem. 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