Automatic DC switching

[Sominus]

SO elsewhere in the forum I've posted regarding how to set up an automatic switch for a DC when turning on a tool.

My question is: That automatic switching mechanism doesn't work so well in the presence of a magnetic switch on the DC. Any thoughts on how to implement something like that?

[Stick486]

what did you just attempt to say???

[Sominus]

The automatic switching of a dust collector outlined here works if you don't have a dust collector that is actuated by a magnetic switch (like mine is). I was wondering if there was a magic way of doing that in the presence of a magnetic switch, or if the removal of said switch is advisable (I would think not).

In other words, I want my dust collector to come on when I turn on one of the tools, a la this again. I would also like to be able to turn on the dust collector manually without a tool being turned on.

[Sominus]

....and I just read an archive somewhere about the "short cycling" of large(r) DC motors - they don't like it (predictably) so a timer (for say, 10 minutes) to delay shutoff would likely need to be thrown in the mix.

[Herb Stoops]

I am not an electrician so I can't explain how the electrician did it,but mine is on a remote lapel switch. I have this small push button,(Garage door type fob) switch hanging from my lapel. I can either click it before,or after I switch my tool on. It works for all tools or no tools. As an alternate if I forgot to bring the lapel switch to the shop, I have manual switches on the 2 side walls located in the center of the walls and on the end wall where the mains switchbox is ,there is a manual switch there also. I can also switch on the DC in the closet outside the shop where the Fan-cyclone and filters are located,with a hard wired switch.
I know he installed a remote controlled mag switch on the motor, a 3 hp. 240v. motor.
Herb

[Cherryville Chuck]

Mag switches are necessary on tools like saws, jointers, and shapers where injury could occur if there was a power outage or tripped breaker and the cutter suddenly started up without warning once the circuit became re-energized. A dust vac poses very little danger, if any, should it suddenly re-energize. There are no moving parts you could come in contact with. The sudden suction isn’t likely an issue except for maybe scaring the poop out of you.

[sunnybob]

Magnetic switches (NVR) are really good safety devices. I add them to my stuff, not remove them.
But what you can do in this instance is wire your auto switch between the NVR and the motor. That means you would need to operate the NVR when you first walk into the workshop, but the DC wont start until you use the remote. If there is a power cut, then NVR will operate as its supposed to and isolate the machine. You would then just need to press the NVR again.

[Stick486]

Any thoughts on how to implement something like that?

consult your Ugly's....