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Overriding fan speed with tach/voltage leads
I have a 12V 0.8A Nidec TA450DC fan in some equipment and I need to slow the
fan down to about 75% of its speed. It has four leads: red, black, yellow, and green. I guess that yellow is the RPM sensor and green is the high/low voltage sensor. I tried using a 5-ohm resistor as well as a zener diode on the red lead. This did not work because the equipment senses something is wrong, and the fan won't spin. To try another strategy, is there something I can place on the green or yellow lead to trick the system into reducing the fan speed? |
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