I have s WW Pro with Redline Spindle and 240v VFD. A little surprised that Redline didn’t consider providing easy method for using a relay to power dust collection system. I understand that what I need is a ‘current sensing’ relay. Can anyone provide a specific recommendation for a particular rel…

Wrong pin. I found it, and found the other gnd pins in the bb tech manual. No need for replies.

I’ve been using an iVac for the last couple of years, and have had no issues with it. The current sensing unit has a switch that allows you to disable the auto-start, or manually turn the vac on, which is handy when I use my Suckit hose to vacuum the machine bed before placing new material on it.

Hi John - I don’t know what you mean by a ‘current sensing relay’. Fundamentally, if the controller knows when the cut starts, then it can enable the dust collector using a simple digital signal. Alternatively, if you really want to “sense” current, then something attached to the spindle controller …

I have done this multiple times using a current sensing switch from Amazon to trigger a relay with my 110v spindle to start a 220v dust collection system and also to turn on a 110v dust collection system whenever one of 4 different 220v 3ph surface grinders start. You have to split only one wire fro…

This is the switch I used Jadeshay AC Current Sensing Switch, SZC23-NO-AL-CH Adjustable 0.2-30A Normally Open Self-Powered Current Sensing Switch: Amazon.com: Industrial & Scientific

Tom, the new Redline VFD cables to the BB Controller using their own custom cable to the DB25 on the BB, and no access to separate start/stop pins like there are on for example a Huanyang VFD.

Rob, I saw that switch from your previous post - what I couldn’t find is what is the output voltage from that switch so I can match it to the proper relay?

[image] jnordyke: is what is the output voltage from that switch so I can match it to the proper relay? You can use a 110v contactor. The switch only closes a circuit what voltage goes in comes out. The switch is normally open and when it senses current it closes. it does not handle a lot of …

John, this is the contactor I used for the 110v dust collection. Amazon.com: SunLee 2 Pole 40 Amp contactor 120v coil UL 2 pole Lighting Load 50 AMP Contactor equivalent to 42CF15AF Condenser Compressor Contactor : Industrial & Scientific I have a total of $120 invested in that system including 50 f…

It’s covered in this thread: [image] Tool Enable - M15 - IOT Relay - & Breakout board (auto turn off/on router) Controller (Buildbotics) Discussion I have been trying to leverage the tool enable and this IoT relay My previous CNC had this and it was a great fe…

Thank you Rob - with my previous OF I had a HY VFD with a convenient 12v signal on start and programmable delay on stop that I used to close a normally open 110 relay to my shop vac. I guess I could find an independent 12v power source and still use that relay. I appreciate the legwork you put in. …

Current Sensing Relay Recommendations

Original/PRO Series (Buildbotics) (Gen 1)

OnefinityCNC (Onefinity CNC Official ✅) October 6, 2025, 1:17pm 10

It’s covered in this thread:

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Upgrade to Redline Spindle Onefinity Spindle Kit by Redline CNC	18	262	March 13, 2026
Please help me understand how to connect my Dust collector to my VFD	1	336	January 5, 2024
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Tool Enable - M15 - IOT Relay - & Breakout board (auto turn off/on router on Buildbotics Controller)) Controller (Buildbotics) Discussion	160	21565	January 7, 2026
Trigger Solid state relay with Redline Spindle Troubleshooting (X35/X50)	5	258	January 25, 2026

Current Sensing Relay Recommendations

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