1This page shows how I wired up my wood-shop dust collector to work with a wireless remote switch. But first a little background. My dust collector has bee disassembled and mounted to a shelf on the wall. This has decreased its footprint, but it has also made it somewhat difficult to get to the on/off switch. Even were this not the case, I would still like to add a wireless remote, as it will make the system much easier to use.
My first choice to accomplish this was to buy a commercially available wireless remote switch. 120-volt remote switches are a dime a dozen and can be found easily. These remote switches will easily handle low amperage loads especially on resistive circuits (i.e. light bulbs). In fact, you will often see these sold as Christmas light remotes. However, remote switches that will handle 240-volt current, at higher amperages, and on inductive loads (i.e. capacitor start motors) are harder to find and much more expensive.
I found that Grizzly had a newer model 240V Dust Collection Remote. It was about $60 with tax and shipping, by far the cheapest commercial option, so I thought I would give it a try. Don’t buy it… It’s crap! I ordered one and when it arrived plugged in according to the directions. I pressed the on button… nothing. I pressed again, and again, and again. On about the tenth attempt the dust collector finally turned on. I then tried to turn it off. You guessed it, nothing happened. After about five attempts the collector finally turned off. I tried this several times, from various location in the shop, even with the remote 12-inches from the switch, and the situation never improved. I contacted Grizzly and arranged to send the unit back. Instead of asking for a replacement, I decided to build my own.
I decided to build my own remote system after reading a thread on Woodnet.net. The original poster, Dominic Greco from Two Guys In A Garage Toolworks, also wrote a great article on his website showing the steps he took to install this system. You can see his article here: Shop-Built Wireless Dust Collector Remote. The system that I have designed is similar, but has a few changes that you’ll see as we progress.
Before I get started, I suppose I should give a little explanation of what this system is supposed to do. The two main components are a 110v wireless remote (Christmas light) switch and a contactor. A contactor is an electrically controlled switch. Essentially, one electrical circuit is used to switch on/off another separate circuit. It is primarily used to allow a low power circuit to activate a much more powerful one. A good example of this would be the thermostat in your house. In this example, a 24-volt low-power wire runs from your thermostat to either your air conditioner or furnace. When the thermostat senses that it needs to turn on the air-conditioning or heat, it sends a 24-volt signal to a contactor. This contactor then closes the switch on a much higher power 240-volt high amperage circuit. This turns on your heater or air-conditioner. You may ask yourself, why all this hassle? Why not control the air-conditioner directly? But, do you want 240-volt, 50A power running to your thermostat? You touch this all the time, and if it shorts…
So, in my case, I’m going to use a cheap 110-volt wireless remote switch to send an electrical signal to an appropriate sized contactor. This will turn on and off the much more powerful 240-volt circuit that goes to the dust collector. This means that a 120-volt and a 240-volt wall outlet are both needed in the area where the system in installed.
Two other things to consider. When buying a contactor, make sure you get one that takes a 120-volt signal. If you buy a 24-volt controlled contactor, you’re going to fry it. The other thing is checking to see what kind of switch you already have on your dust collector. If it is a simple on/off switch that you can leave in the on position, you’re in business. If it has a magnetic switch, you are going to have to do some googling to see how you can bypass it.
Last thing before we get started! I’m not an electrician. If this makes you nervous, don’t do it. If you’re not sure if this meets code for your area, check. Better yet hire someone. I’m not encouraging you to do this, only showing you what I did. Electricity is no joke. Proceed at your peril!
So, with all that out of the way, let’s get started. I went to a few stores locally to get the best prices on all the relevant parts. I did this over the course of a week while I was out running other errands. I didn’t go driving all around town just to get these parts. I went to my local electrical supply specialists, Home Depot, a local plumbing supply place that also carries a lot of electrical stuff, and a local general store. I purchased the 120-volt remote from Amazon.
Here are the parts that I purchased
- Electrical Junction Box $ 9.00
- Square D 8910DPA33V02U1 Contactor $ 35.00
- 1/2″ Cord Grips (Nylon grommets) – 2@ $1.92 $ 3.84
- 14/3 wire – 5 feet @ $0.63/ft $ 3.15
- 12/3 wire – 5 feet @ $0.97/ft $ 4.85
- 120V 15A Plug $ 3.97
- 250V 20A Plug $ 5.19
- Handy Box $ 0.68
- Handy Box Face Plate $ 0.68
- 250V 20A Receptacle $ 4.97
- Offset Nipple $ 2.05
- Conduit Lock Nuts $ 0.78
- Woods 32555 Remote Control Outlet $ 14.20
Total Spent: $ 87.68 (plus the taxman)
Here’s the remote that I bought from Amazon:
The contactor that I purchased from my local electrical supply specialist is heavy-duty. On a single phase, 240 volt circuit, it will handle 30 amps of inductive load. This means it can handle motors of up to 5 horse power. Way more than I currently need, but unlikely to wear out, and it has plenty of capacity if I ever upgrade the dust collector.
I put the contactor in the junction box and marked where holes were needed (you can just see the black dots below). I then drilled these at the drill press.
I did not want to cut the plug off the dust collector cord. Admittedly, doing so would have made things a little simpler, as I could have run the cord directly inside the junction box. Instead, I added a handy box that will house a 250-volt receptacle. I connected the handy box to the junction box using an offset nipple and some locknuts.
Next I started to run some wiring. 14 AWG for the 120-volt line and 12 AWG for the 240-volt. I used cord grips (nylon grommets) where the wire went through the wall of the junction box.
The 120-volt line comes in the top cord grip and attaches to the contactor. I just realized that the picture below doesn’t show it very well, but it attaches down low where you can’t see it, not to the top screws. The 240-volt line comes in and attached to the bottom screws on the contactor. The top screws on the contactor are the line out to the receptacle.
All of the grounds were linked together and a ground run to the box itself.
Last, I added the plugs to the cables.
When I mounted my dust collector to the wall, I used a plywood backer to support the brackets. I attached the junction box to the plywood using washer-head screws.
The 240-volt wall receptacle is above the shelf and the the 240-volt “line in” plugs in there. The cord from the dust collector plugs into the new 240-volt receptacle in the handy box.
The 120-volt wireless remote switch needs to be placed in between the wall outlet and the 120-volt “line in” on the new junction box. When the wireless remote activates the 120-volt circuit, this fires off the contactor and starts the dust collector. I tested the system before plugging in the dust collector to the new outlet. When you activate the remote, your hear a significant “SNAP” as the contactor activates. I hesitated to use the word “bang” as it is not firecracker loud, but it is definitely more than a click.
I plugged the dust collector in and tested everything once more, and it works great.
I took the wireless remote and hung it on a hook on my band saw. Since this is in the middle of my shop, it’s never far out of reach.
There are a few differences in my system from the one I linked to earlier. Mine has a much heavier duty contactor. Granted, I paid a lot more money for it than others available on amazon, but I think this one should give me many years of use. I was able to off-set some of this extra cost by shopping around for the other parts and getting a pretty good deal on them. The other difference is the addition of the handy box with the 240-volt receptacle.
I still need to tidy up the wires a little and I’ll probably use cable ties to do so. All in all, I’m very happy with this project and I’m convinced it is way better than a commercial 240-volt remote.
A big thank you goes out to Dominic Greco for the inspiration to set my remote system up this way.
– Jonathan White
If you would like to see all of my blog posts about installing my dust collection system, you can find them here:
- Dust Collector Project – Part 1 (mounting the dust collector on the wall)
- Dust Collector Project – Part 2 (installing a shop made wireless remote system)
- Dust Collector Project – Part 3 (designing and making brackets to hang 4″ PVC pipe)
- Dust Collector Project – Part 4 (Cantilevering a section of pipe under the garage door)
- Dust Collector Project – Part 5 (Making blast gates for the dust collection system)
You description of the setup with the contactor is exactly what I need except that I can’t quite make out how the contactor is wired. I can’t see in the pictures where the various wires are attached. If you could identify the connection by the lables (L1, L2, L3 and T1, T2, T3) that would be very helpful indeed.
Thanks for a great article.
It is me, Graham, again.
I think I just figured out why I was confused. The 120v line appears to be connected to the lugs below the terminals shown at the top of the picture. That is what your description states but I was not understanding what “below ” meant. I was thinking that you were referring to the contacts at the bottom of the photo and that clearly is intended for the 240 volt line in.
So if I have it right, and for the benefit of those few who are as dull as me:
– the 240v line in is connected to T1 and T2 contacts at the bottom of the photo
– the 240v line out is connected to L1 and L2 shown at the top of the photo.
– T3 and L3 are not used as this is a three pole contactor but only two poles are being used for a single phase motor.
– the 120 \v line is connected to the lugs near the base of the contactor. In my case they are labled “A1” abd “A2”.
If I am still wrong, please let me know so I don’t mislead others.
Thanks for commenting and clarifying the wiring. I did this 18 months ago, so just went back to review it.
You are correct, by below, I meant at the base of the contactor, not the lower part of the photo. You’re also right that I only used two of the three available poles on the contactor. I only switched the two hot lines. I suppose that I could have used the third pole to switch the neutral line, but didn’t think that made any sense. I just wired the input and output for those lines together with a wire nut. I don’t know what an electrician would say about that, but it has been working well for me.
I really appreciate you taking the time to comment here. You just made this post much better for anyone who comes along and reads it later. Thanks!
All the best,
Thanks Jonathan for the quick response and confirmation of my intended clarifications. I am in the process of wiring my dust collector system following your example. Your post was exactly what I needed to figure out how the contactor needed to be wired.
Can this be altered to accommodate a 110v 1.5hp dust collector
Yes, I suppose that this could be done that way. My system uses a low amperage 120v circuit to turn on/off a higher amperage 240v circuit. I don’t see why you couldn’t use it to turn on/off a higher amperage 120v circuit. That said, the commercially available 120v remote switches are cheap enough that its probably a waste of time to do all this for a 120v tool. At the time I did this, a 240v remote switch capable of the amperage that my 2hp dust collector draws was either not easily available or too expensive.
I’m doing this with mine. The DC takes needs 20 amps and I can’t find a remote for more than fifteen unless I buy the ready made and I have heard bad things about them. So I’m using only one side of the contactor I bought, and no tripped breakers. A little cheaper than store bought and a whole lot beefier.
I agree completely. The commercially available ones are limited in power or very expensive. I think the low power remove paired to a contactor is a much better option.
I didn’t know what a contactor was till I read your article. I have a back ground in electonics and grasped your theory right away. Found a two pole, 120v coil contactor at Carolina Supply and the rest of the parts I needed at Home Depot and Lowes. My remote switch is up and running, just waiting for my Jet DC650BK to arrive (switching to 230v). FYI, I am replacing the 30micron filter with a 1micron Shaker Felt Dust Collection Bag. Thanks again for the idea.
You’re welcome, I’m glad that you found the post helpful.
I am building one of these similar to yours. Dumb question but how do you mount the contactor to the box? Do you just use regular 8-32 screws/nuts/washers/lock washers? If so, do you put the head of the screw inside or outside? And wouldnt that leave a bump on the back of the box? Is that a problem? Or do you just account for that with your plywood backer? Thank you
If I recall correctly, I just put a washer head wood screw through the contactor, through the housing box, and into the plywood behind.
Hope this helps.
Another advantage of this system is that because the remote control works through walls I was able to put my dust collector in the garage. With the collector in the garage I can have an outlet for my vacuum hose there but turn the collector on or off while in the garage even though the switch is in my basement. All I have in the shop is a cyclone.
Another major advantage of having the collector placed in a remote location is that the noise in my shop to a whisper. I also save precious space. I have see where others actually constructed a shed outdoors for the collector. It obviously need to stay dry but cold temperatures is not an issue given that we can have very cold winters in Canada where I live.
When buying the remote switch you might consider getting one that has multiple device capabilities. Mine has switches for three circuits. I use the first with the contactor that drives the dust collector and the second for the air cleaner, which is 120v and does not need a contactor, and I use the third for whatever might be useful – like a light. Being able to turn on the dust collector and the air cleaner at the same time is convenient and thus actually encourages me to use it. The cost of the three outlet set was still very cheap. Mine has been working flawlessly for three years.
Super helpful posting.
You said it perfectly and I don’t disagree with a single thing you said. I would have loved to put my dust collector outside the shop, but with the way mine is setup, that just wasn’t possible. Thanks for your comments.
All the best,