Downdraft design questions

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23 Dec 2020 17:04 #192988 by txtrone
Replied by txtrone on topic Downdraft design questions
Just to make sure I am not doing anything redundant... are the LED and resistor, which come installed on these solenoids serving the same purpose? Or are the for something completely different?

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23 Dec 2020 17:34 - 23 Dec 2020 17:35 #192989 by PCW
Replied by PCW on topic Downdraft design questions
Do you have the solenoid data sheet?
its odd that it has 3 terminals

The LED/resistor is just an indicator, a flyback diode is still needed
(if its not built in, which is where a data sheet would help)
Last edit: 23 Dec 2020 17:35 by PCW.
The following user(s) said Thank You: txtrone

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23 Dec 2020 18:11 - 23 Dec 2020 18:13 #192992 by txtrone
Replied by txtrone on topic Downdraft design questions

Do you have the solenoid data sheet?
its odd that it has 3 terminals

The LED/resistor is just an indicator, a flyback diode is still needed
(if its not built in, which is where a data sheet would help)


It did not come with any data sheet, these are some cheap amazon parts. I did unplug the front piece and was able to tell the bottom terminal is a ground lug connection. ETA: These are 5/2 solenoids, if that makes a difference. Thanks again for your help.
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Last edit: 23 Dec 2020 18:13 by txtrone. Reason: More information

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23 Dec 2020 18:18 #192993 by txtrone
Replied by txtrone on topic Downdraft design questions
Here is a link to this model on Amazon... these are the 24VDC version. It shows, in the photos, that polarity does not matter to power the device.

Link

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23 Dec 2020 18:39 #192999 by PCW
Replied by PCW on topic Downdraft design questions
Looks like the connection close to the LED is positive
(if you want the LED to illuminate)

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23 Dec 2020 22:56 #193036 by txtrone
Replied by txtrone on topic Downdraft design questions
Ok, here is the updated drawing. Obviously the diode is still missing. Before I get to that, does this drawing look correct?
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23 Dec 2020 23:36 #193043 by PCW
Replied by PCW on topic Downdraft design questions
Nothing should connect to TB1 pin 5 (VIN)

VFIELD (TB1 pins 1..4) is where +24V power goes

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23 Dec 2020 23:39 #193044 by tommylight

Nothing should connect to TB1 pin 5 (VIN)

VFIELD (TB1 pins 1..4) is where +24V power goes

Sorry PCW, did not notice that in the other topic, or this one or ...

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24 Dec 2020 00:25 #193047 by txtrone
Replied by txtrone on topic Downdraft design questions

Nothing should connect to TB1 pin 5 (VIN)

VFIELD (TB1 pins 1..4) is where +24V power goes


Now I am really confused. I connected the power based on this schematic. Is this not correct?
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24 Dec 2020 01:07 #193050 by txtrone
Replied by txtrone on topic Downdraft design questions

Nothing should connect to TB1 pin 5 (VIN)

VFIELD (TB1 pins 1..4) is where +24V power goes

Sorry PCW, did not notice that in the other topic, or this one or ...


I am truly confused, what is different on my drawing vs Norbert's... besides the terminal block between the power supply and mesa board?

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