Simple relay control... or not?
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Thanks, @droftarts.
There is no PSU. I need to provide a voltage (3-14v) to operate and hold the relay (it's non-latching) and then 0v to release it.
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@nightowl999 You're running the board on USB power?
Ian
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Sorry, @droftarts, I'm being a bit slow...
No, the Duet3 is running from a 24V PSU.
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@nightowl999 Then don't use the heater outputs, as 24V will be too much for the relay. You can use a fan output, with the fan voltage set to 12V. I would imagine the current draw of a relay is less than 2A.
Ian
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Thanks, @droftarts. Does that mean I could use Out 7, 8 or 9 and change your code accordingly, or are they 24V because I'm using a 24V PSU?
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@nightowl999 You can use out4, 5, 6, 7, 8 or 9. Above each bank (out4-6 and out7-9) there is a 3-pin header. This selects the voltage for each bank, and can be set to V_FUSED (fused VIN, ie 24V) or 12V (using the onboard 12V reglator).
See the wiring diagram for setting: https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Mainboard_6HC_Hardware_Overview#wiring-diagram
Ian
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Brilliant, thank you @droftarts!
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@droftarts said in Simple relay control... or not?:
@nightowl999 Then don't use the heater outputs, as 24V will be too much for the relay. You can use a fan output, with the fan voltage set to 12V. I would imagine the current draw of a relay is less than 2A.
Ian
RELAY 20 MHA MAX 80MHA
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@droftarts said in Simple relay control... or not?:
@nightowl999 Then don't use the heater outputs, as 24V will be too much for the relay. You can use a fan output, with the fan voltage set to 12V. I would imagine the current draw of a relay is less than 2A.
Ian
Isn't the maximum amps 800mA at 12V? or am I reading it wrong?
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@jumpedwithbothfeet Yes, you're right. It's 2A with V_Fused, 800mA total current with 12V. Looks like the relay is well below this, though.
Ian
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@droftarts I was half hoping it was 2 amps it would of simplified my wiring a fair bit!
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@droftarts said in Simple relay control... or not?:
Just as a quick follow-up, this should work, then:
M950 R0 C"out4+out7"
...with the relay wires connected to the pins of Out 7 and the Out 7-9 jumper between V_OUTLC2 and 12V?
Thank you
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@nightowl999 yep
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@nightowl999
I just read the Amazon description for your relay-control module and it says it can be triggered by an Arduino using any voltage from 3 to 14 Volts, so you don't need to worry about drawing too much power from the onboard 12 Volt supply at all.
Where did you read that it takes 2 Amps to drive the module? I'd like to verify that.
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Erm, I didn't @alankilian. That was @jumpedwithbothfeet wishing it was 2A!
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@nightowl999 said in Simple relay control... or not?:
Erm, I didn't @alankilian. That was @jumpedwithbothfeet wishing it was 2A!
OK, I got it.
It looks like you're in good shape!
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@alankilian
Yep. Just keep an eye out for a big cloud of smoke in SW England. If there is one, it didn't work
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@nightowl999 have you considered using the Laser/VFD output to drive the relay module? It provides a 5V signal.
