a5:remove-fan-pwm-noise
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| a5:remove-fan-pwm-noise [2018/07/06 04:04] – [Connection On MKS GEN_L Mainboard] aeket | a5:remove-fan-pwm-noise [2020/12/25 02:13] (current) – external edit 127.0.0.1 | ||
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| PWM (Pulse-width-modulation) is a technique to control the performance of e.g. a fan (as in the A5). | PWM (Pulse-width-modulation) is a technique to control the performance of e.g. a fan (as in the A5). | ||
| As a side effect, noises can be emitted through the fan due to the pulsating current. This refers to noises that cause the propeller to vibrate due to the electric coils. Noise can also have other causes. Worn bearings are often the cause. The PWM filter does not help against this kind of interference noise. | As a side effect, noises can be emitted through the fan due to the pulsating current. This refers to noises that cause the propeller to vibrate due to the electric coils. Noise can also have other causes. Worn bearings are often the cause. The PWM filter does not help against this kind of interference noise. | ||
| - | If the fan is mechanically good and there is still noise, then it is the PWM frequency emitted by the fan. The Marlin firmware offers several options to reduce noise by software. I have checked all these options. Unfortunately, | + | If the fan is mechanically good and there is still noise, then it is the PWM frequency emitted by the fan. The Marlin firmware offers several options to reduce noise by software. I have checked all these options. Unfortunately, |
| - | //Note:\\ | + | < |
| - | Just as the A5 is delivered from the factory, only the component cooler is PWM controlled. The Cold End Fan is directly connected to 24V. Here the filter can not filter PWM noise. In another | + | Note: |
| + | Just as the A5 is delivered from the factory, only the component cooler | ||
| + | is PWM controlled. The Cold End Fan (A5 upper fan) is directly connected to 24V. | ||
| + | There is no PWM. So the filter can not filter PWM noise. In another | ||
| + | I show how to control | ||
| + | Then the PWM filter helps to prevent PWM noise for the Cold End fan, too. | ||
| + | </code> | ||
| \\ | \\ | ||
| - | **Required Electrical Parts (for one fan)** | + | **Required Electrical Parts** |
| * 1 x Diode **1N 4007** | * 1 x Diode **1N 4007** | ||
| * 1 x Resistor **100 Ohms 3 Watts** | * 1 x Resistor **100 Ohms 3 Watts** | ||
| Line 22: | Line 28: | ||
| * Optional 2-Pin plug and socket for building a plug-in-adapter. | * Optional 2-Pin plug and socket for building a plug-in-adapter. | ||
| * Some cable and heat shrink | * Some cable and heat shrink | ||
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| + | |||
| The hobbyist will most likely have the parts in the tinker box. | The hobbyist will most likely have the parts in the tinker box. | ||
| Line 46: | Line 54: | ||
| ---- | ---- | ||
| - | Status | + | Status |
a5/remove-fan-pwm-noise.1530813849.txt.gz · Last modified: 2020/12/25 02:13 (external edit)
