The voltage range is 16v to 30v with 24v being preferred.
You control the speed with a 0v-12v signal. See section 2.1 of you datasheet.
Hi again,
I have some 18V batteries so I think I will try to use that to power the fan. I don't need anywhere close to full power anyway.
Aside from powering the blower, can I use the same 18V battery to control the speed by using voltage division and a potentiometer to get a variable voltage of 0v-12v at the control? I think the current draw will be minimal if I use high resistance resistors and this seems the easiest way for me.
To get the tachometer to work (I've provided relevant images below), it seems I need to supply a voltage (tacho operating voltage) at wire 4 (U_bs) with a voltage <= 30V. Then, I can count the number of pulses at U_s (tacho signal).
I should be able to use the same 18V battery for U_bs, since it's <= 30V.
U_s has a high and a low. The high seems fixed at 30V regardless of U_bs. The low is determined by resistor R_a, which is what I provide. I need to ensure that the sink current is <=20mA with a suitable value for R_a using the equation they provided.
![](https://i.imgur.com/9CCewHA.png)
![](https://i.imgur.com/bBLRFN8.png)
The datasheet also provides the following schematics with the 10k and 15k resistors. But I think those are internal to the drive electronics and is not something I need to worry about.
![](https://i.imgur.com/1RXOmss.png)
Please let me know if I understood it correctly. Appreciate it.
Thanks