Downdraft design questions

Interesting. I was thinking I needed a filter before each DC power supply (between the mains and the power supply) whether they are on the same branch circuit, separate branch circuits derived from different phases, or separate branch circuits derived from the same phase.

Probably too late now, but just for future reference:
Mounting the motor drives horizontally is not ideal as the lower ones heat up the ones above, much better to put them vertically with some space in between.
Looks good otherwise.

Ah, that makes sense! I may be able to rearrange them.

txtrone wrote: Ah, that makes sense! I may be able to rearrange them.

I nearly said something as I got caught but not with those drives. I had to rearrange mine once they were running 90 volts!

You dimensioned well the cabinet just the board and drivers, need to see if youll crowd with wires
The Aciera advice is one of the points to pay attention when design.

2. Avoid stacking heat producing components one above the other, and allow an unrestricted flow of air behind components whenever possible

Avoid this will help in your wire route too

7. Wiring can also affect enclosure temperature. Properly cabling wires and routing bundles along enclosure corners keeps wires from resting on components and helps minimize airflow restriction.

You have small drivers 80W and at idle 50W, DM542?
I dont think you even need the fans, the big hole for wire i think take off the fan purpose, fan tend to fail and if the design need it to run its something to consider, its okay to run with open door until fix the fan?
If you paint your box will help a lot to reduce heat too.
Check this calculator
www.punchlistzero.com/control-panel-heat...sipation-calculator/


The quotes are from here;

thermal-edge.com/thermal-management-guid...voiding-overheating/

Another calculator;

thermal-edge.com/enclosure-temperature-management-calculator/

Many drives mention in their manuals that they must be de-rated if not mounted in their optimum orientation. (The addition of forced air cooling can also make a difference in ratings.)