Automatically starting a dust collector

[gbudke]

That system is realy old

That system is realy old

That is pretty cool!

I saw a system like that when I first started as an apprintice we were tearing it out and replaced it with a 3 phase system, I have not seen one since. The master I worked with said he use to see several, but did not think anymore of them existed anymore. That was 25 years ago.

 

[glene77is]

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Interesting info. We don't see these on the job.

 

[glene77is]

ConMgt,
Interesting!
This is very unusual to my experience.
I certainly could use some diagrams.

 

[quogueelectric]

I designed a dust collector controll that does not need to be wired directly to the shop tool or starter. I used a current sensing switch (see the link below) to energize the coil of an interposing ice-cube relay and energize the coil of a HP rated contactor for the dust collector. The CT is rated up to 100A so you can run multiple tools through the same CT switch. You can also parrallel CT outputs in order to control more than 100A of shop loads. I installed a time delay relay in the contactor control circuit to delay dropping the dust collector a few seconds after the shop tool is turned off so the dust collector evacuates all the saw dust from the collector ducts. I also incorporated a three position switch for on/off/auto control. If the saw and the dust collector circuits are fed from the same panel this is a great way to control the collection system as you don't need to run control wires all over the place. All the parts fit into a 10x8x6 hoffman box with a back plane and hinged door. The can gets located next to the power panel and you put the CT in the power panel on the load wire and run the dust collector feeder through the control can. I installed one in a friends cabinet shop and he loved it. He was able to turn his dust collector on and off automatically each time he used his shop equipment. Be happy to share more details if your interested.........

http://www.crmagnetics.com/newprod/ProductView.asp?ProdName=CR9350

Bingo exactly what I was thinking I used a lot of these working for carrier building control unit. Lots of options here.

 

[conmgt]

I have one: what is the source of this 2ph system? Your own motor-generator?

The 2ph is supplied by the utility company. Later I'll post pics of the pole transformers that serve all of the industrial buildings on the block...some with very large services. Mine is 400A but the building across the street has it's own trans room.

 

[jimday]

My thoughts exactly on the SJO but with a current sensor the point is now moot because there won't be a need for any wiring between the saw and collector...the circuits for both are in the same conduit and terminate within a foot of each other. When I finish the project, I'll post photos, details, and cost.
CR Magnetics has current sensors with Delay on Make timers built in.

Sounds like you want a "time off delay". The CR Magnetics CR4395 and CR5395 series only have a "time on delay" for the controlled relay. Thats why I could not use them for my control. I had to pair up the CR9350 current switch with a timing relay.