Let’s start with the two-digit LED readout on the front panel. Do you need it? Of course not. It’s linked to a PWM fan hub and shows the unit’s duty cycle (power proportion) for values below 100% and “HH” for full speed. Next to it are a Turbo button that simply overrides the PWM input signal to make connected fans operate at 100%, plus a Reset button, a key lock, and a red power button. Power, drive activity, and Turbo LEDs are lined up along the top of the same panel.
The power…

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