Thread: Remote start for Dust extractor

Originally Posted by Sawhack

Yep, running 6 inch PVC as we speak, but having to step down to 4 inch PVC with flex hose as close as I can to the tools.

I’m having trouble posting pictures, but this is the link to the unit:

https://www.timbecon.com.au/sherwood...dust-extractor

In that it says:
“ At 750CFM (cubic feet per minute) the 2200W (3HP) motor provides exceptional suction whilst being able to be run on a standard 10A house plug. This unit has more than enough power to handle 2 machines at once through its two 100mm intakes or 125mm single intake. Unlike single stage dust extractors, these are high static pressure/low volume. This means though the CFM is lower than a single stage machine, this unit provides more than enough dust collection to handle multiple machines simultaneously.”

Give them a call and ask how big the impeller is, HP as long as it is enough to drive the impeller means nothing at all. A 14" impeller when driven by a 3HP motor or a 5HP motor will move exactly the same amount of air at the same impeller speed. Please disregard all information that refers to air volume in any sales literature, most of it is wishful thinking and all of it refers to the US where dust extractors operate at far greater speeds. Selling dust extractors is a con game run by retailers to make the customer feel good.

Originally Posted by jack620

They won't cope with the loads imposed by a 3HP motor. I'm aware that 3HP is leass than 2400W, but the inrush current on start and the voltage spike on shutdown will fry the relay contacts in short order.

I use an Arlec remote to trigger a 25A contactor - see this thread and post for more info.

Originally Posted by mpot

I use an Arlec remote to trigger a 25A contactor

That's the way to go.