Hi there,
i want to control a U51DL-012KK-4 radial blower with a arduino mega. According to the data sheet of the blower, the supply voltage is at 12 V and the control voltage for the speed control is between 2 v and 4.4 V. Unfortunately the setup does not work if I apply a voltage via PWM signal to the control line. I also tried it with an IRF9540N COM-MOSFET but the control line of the blower itself seems to output a voltage. I can regulate the Mosfet down to a suitable voltage with an LED at the output. Unfortunately, when I connect the blower, a voltage of of 5 V to 6 V is present (apparantly from the control voltage). With a separate power supply, the setup works as desired. However, it is to be controlled via the Arduino. Does anyone have any ideas?
According to this data sheet there needs to be a 4.7K pulldown on the input voltage. Do you have that?
Have you tried with a low pass filter on the pwm output to get a dc voltage. Alternatively, something like an MCP4725 i2c DAC can be used.
Thank you for the quick reply. I have already tried with the resistor. Then the blower doesn't run at all. But i haven't tried the low pass filter yet.
Is it possible that the current from the arduino is too low?
I don 't see anything in the data sheet that talks about a current requirement for the input voltage.
With a separate power supply, the setup works as desired.
What does a multimeter say about the current being drawn in that situation?
Me neither. The current is about 2 - 3 mA.
You can use this to conrol the speed:
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