I have a project coming to an end, where I use a coin hopper in a machine to dispense coins. The hopper has a 24VDC motor that peaks at 3A. The machine will be used 2-3 days a week. Every day that it's used, the motor powers on via the relay board for 2-60 seconds. In one day, there could be 5-15 times that this happens.
My question is, what is the very best relay for a 24VDC motor? I have read that mechanical ones can weld and have other issues as well. If welding happens, it will become very costly as it will empty the machine of coins. I found a chinese SSR that can handle DC, however I also read that these have problems with leakage, can be randomly activated or do not close when they should?
What do you recommend? I have no problem paying a premium, even if the relay cost $50-100 it's well worth it so my machine doesn't get emptied by relay malfunction. The code for the project is the typical HIGH/LOW code turning the relay board on/off.
The "best" would be using a logic level N channel MOSFET transistor switching the low side of the motor.
Motor peaks.... What data is that?
Use stall current data of the motor to make sure the relay will manage.
Thank you for your reply Would I still be able to use the same code as I have while using one of these? Are there any 'MOSFET transistor board' that I can use, for easy connection like the relay boards for arduino?
Did you continue to read and find WHY the welding happens? It is because the relay remains closed to weeks or months. DC current causes metal migration from one contact to the other and will eventually form a metal link that is too strong for the relay spring to break.
You do not have that situation, do you? So, a simple relay for your project will work perfectly.
No, I did not find that information, but thank you that - normal relays will be used for the project
Do you guy have any idea of the quality of the relays on the relay shields that Gravity and the official Arduino shield? They are almost the same price, so want to buy the best one. The official Arduino one draws power directly from the Uno and the Gravity one have separate power supply for extra protection.
I Googled the model numbers of the relays on the boards.
One of the boards seems to be using 2Amp relays, and the other one 10Amp relays.
That makes the choice for a 3Amp motor easy.
Forgetting the kickback diode across the motor is also a sure way to have the relay contacts fused together.
Leo..
