Building a system using current sensors through Arduino to turn on dust collector. Does anyone know of a 220V ~25A DPST relay that would trigger off 5VDC? All the ones I have found are 24V. Suppose I could boost up from 5 to 24V if I had to, but would prefer not to if possible.
TIA,
Paul
plav1959:
Suppose I could boost up from 5 to 24V if I had to, but would prefer not to if possible.
That would never work with a contactor anyhow as the converter would never handle the inrush current.
Assume the dust collector used with other associated equipment.
Quite normal to run the contactor with the same mains potential as the motor.
i.e. motor runs, dust collector runs.
No requirement for any uC.
I see to many possibilities to guess, post a ladder drawing or schematic with links and or descriptions to the electrical hardware devices involved. You appear to be going to way to much work and expense. What are you sensing and how is it controlled?
Use a contactor with 220VAC coil, switch the coil with a 2 Amp SSR with 5VDC trigger.
EDIT: If you are in North America where you have "split phase" 120/240 VAC, you could use a 120VAC coil IF you have a neutral wire at the contactor location.
Also remember to look at the inductive load rating of your contactor.
In your design, do allow for a sufficiently large heat sink of you want to go for a SSR. You have to expect close to 1W per A switched dissipation, so that'd be 20-25W in your case. That requires ventilation. A mechanical contactor will be much smaller, and doesn't need ventilation.
Yes, you really need to consider motor's full load current and horsepower / kW rating. I would include an overload relay in your design.
https://www.amazon.com/Schneider-Starter-Assemble-Overload-1-6-2-5Amp/dp/B081H21NV7/ref=sr_1_44?dchild=1&keywords=240V+overload+relay&qid=1617851336&sr=8-44
Shop Fox W1666 wiring diagram (220V) is on page 36. Arduino to use individual current sensors on four different machines to open the blast gate for that particular tool and for the Arduino to send a 5V signal to dust collector to turn on. Using an Arduino Uno and an Adafruit PWM/Servo shield.
SSR with old PC heatsink and fan.
I think you cannot get anything other than bootleg these days.
Over cool the thing
Already have one of these on hand, just not sure how I would make it work since it's SPST.
Would something like this with signal from the Arduino to both A and B DC inputs? (with suitable heat sink)
plav1959:
Already have one of these on hand, just not sure how I would make it work since it's SPST.
https://www.amazon.com/gp/product/B0087ZTN08/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Then just switch one of the wires (preferably the live one).
There are two hot legs. How about using two of those fed from the same control wiring?
Ask an electrician.
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