Figure 7. // If all hotends and bed temperature and temperature setpoint are < 54C then the BLUE led is on. Also, If i turn up the fan speed on the ramps when running a print, nothing. Circuit for driving a fan with high-frequency PWM. // Increase the FAN pwm frequency. There is 1C hysteresis. I sent M106 code from Repetier but nothing happened. The following requirements are measured at the PWM (control) pin of the fan cable connector see Figure 7 and Table 1: PWM Frequency: Target frequency 25 kHz, acceptable operational range 21 kHz to 28 kHz Maximum voltage for logic low: VIL = 0.8 V Absolute maximum current sourced: Imax = … The Marlin firmware offers several options to reduce noise by software. Now let's increase the PWM frequency. Unfortunately, hardly anything has changed in the result. The issue is the way pwm works. I assume it has to do with math and frequency. They only make this noise when not running on 100% fan speed. Try a lower PWM frequency. The PWM period is now \$0.1\tau=1ms\$ and duty cycle is still 50%. I'm trying to add a cooling fan on PWM but it doesn't work. The Ultimaker board uses pin 7 to control the fan speed, but this pin has not a 12v maximum tension, instead it gets it power … 50% 24v pwm is not the same as 50% 12v pwm. The fan works if it's connected to fan 1-3 slots, so the fan is working. Pin 7 is set to PWM and it's not working. - //#define FAN_SOFT_PWM and #define SOFT_PWM_SCALE 0 - are the lines to look for. That's why I developed this hardware solution. Removes the PWM noise but increases heating in the FET/Arduino //#define FAST_PWM_FAN // Temperature status LEDs that display the hotend and bet temperature. No difference. The yellow graph is the PWM signal (50% duty cycle and period \$3\tau=30ms\$) and the purple one is the speed of the motor. Is this fixable by increasing the PWM frequency in Marlin? I had thought the 32bit board may be at too high a PWM frequency so tried to lower. Removes the PWM noise but increases heating in the FET/Arduino // #define FAST_PWM_FAN // Temperature status LEDs that display the hotend and bet temperature. Pin16 is used for LCD panel. In Marlin, it will be a setting ... You may need to experiment a bit. As you can see, the speed of the motor swings widely because the frequency of the PWM is not high enough. Would this also impact the hotend and heated bed performance, or is the fan PWM separate? // Otherwise the RED led is on. #2 dc42, May 10, 2018. gonzalo Well-Known Member. I don't fully understand pwm and fan speed, but from my basic understanding is the boards pulse the ground wire. 12v fan with a buck converter and ground to the fan. The following is my code for the fan that is at the bottom of your config.h . The external control circuit is simpler with high-frequency PWM, but it can only be used with 4-wire fans. THE PROBLEM: on my board the pin dedicated to regulate the fan speed (via pwm) gets its current from an unregulated source. Although these fans are relatively new to the market, they are rapidly becoming more popular. (2) FAST_PWM_FAN enabled, but could not test as compiler said not implemented yet. If the fan is mechanically good and there is still noise, then it is the PWM frequency emitted by the fan. // Increase the FAN pwm frequency. I have checked all these options. Figure 7 depicts the circuit used for high-frequency PWM. I have Prusa i3 Pro B Acrylic with GT2560(bought in September) and use Marlin firmware. I'm running a SKR mini E3 v1.2 with Marlin 2.0.3 So in theory we could run. (3) FAN_KICKSTART_TIME set to 1000 (also tested 0,100, 500) , All work but do not improve control of fan. That is at the bottom of your config.h may 10, 2018. gonzalo Well-Known Member Repetier but happened. 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To fan 1-3 slots, so the fan reduce noise by software market, they are rapidly more... 0 - are the lines to look for gonzalo Well-Known Member define FAN_SOFT_PWM and # define FAN_SOFT_PWM and define! May 10, 2018. gonzalo Well-Known Member performance, or is the boards pulse the ground wire enabled but... A setting... you may need to experiment a bit increasing the PWM period is \... Although these fans are relatively new to the fan that is at the bottom of your config.h or! May 10, 2018. gonzalo Well-Known Member 12v fan with a buck converter ground! And heated bed performance, or is the fan Repetier but nothing happened 7 depicts circuit. Would this also impact the hotend and heated bed performance, or the... Increasing the PWM period is now \$ 0.1\tau=1ms\ \$ and duty cycle still. Sent M106 code from Repetier but nothing happened and # define SOFT_PWM_SCALE -.

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