Downdraft design questions

tommylight wrote:

VIN should not be used as it can be disconnected with the jumper, use the 8-32V pins on TB1 for powering the board.

Like this? Or does the -24 need to go somewhere else?

Ok, just for the record: There is no -24V here.
I get that you refer to the negative terminal of the 24V DC supply but lets call the positive terminal 24V and the negative terminal 0V or GND.

Now you're missing the power for the FPGA. So go back to the schematics before and just move the 24V from the "VIN" Pin to one of the "8-32V" Pins below that and bob's your uncle.

[edit]
In other words:
TB1 : Pin8 < GND, Pin4 < 24V
TB3 : Pin23 < GND, Pin22 < 24V

Aciera wrote:

Ok, just for the record: There is no -24V here.
I get that you refer to the negative terminal of the 24V DC supply but lets call the positive terminal 24V and the negative terminal 0V or GND.

Now you're missing the power for the FPGA. So go back to the schematics before and just move the 24V from the "VIN" Pin to one of the "8-32V" Pins below that and bob's your uncle.

[edit]
In other words:
TB1 : Pin8 < GND, Pin4 < 24V
TB3 : Pin23 < GND, Pin22 < 24V

So exactly like Norbert's schematic, except TB1 Pin5 should be Pin4 (or 3,2,1)?

How does this look?

Yes, that looks good to me.

Thanks for holding my hand through that!

Do I have the diode polarity correct at the solenoid?

Yes diode is fine like that.

Aciera wrote:

Yes diode is fine like that.

Thanks again! Hopefully I can get the blast gates working over the holidays.

This is how I have the diodes wired across the solenoid terminals. Does this look correct? I did not connect the 'drain' wire to the solenoid, but I will connect it to a common bus, which will be connected to the cabinet ground.

Sanity check before I go live.

This is the 7i76e, powered by 24v, attached to eight solenoids via digital outputs, with a diode across the terminals at each solenoid. I used two negative terminal blocks in the schematic to make this easier to look at. I am only using one in the cabinet.

From what I can see, you should be good to go.
Wire in the power and check you have 5 volts on a stepgen (eg between TB2-1 and TB2-6)
I think I would get the motion side up and running if you have not already.
Then I would install the ddraft component and connect the outputs to them in hal.
Check with halshow its working like in the screen dump I shared.
Check with a multimeter that the pin goes high +24V (between the output pin and GND - TB1-8) in sync with Halshow.
So when you get that far you know all is good on the 7i76e side
So then power off the 7i76e and connect one solenoid to one output pin. Power up again and confirm that shutter fires in that segment.
Once happy, wire up the remaining solenoids and watch on with big grin while making music with jog wheel and air rams!