Installing 12 VFDs in one control cabinet

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Fallriverbryan said:
AC for the cabinet.

The boss already had the heat load calculated by the drive supplier. I forget the exact number but believe it is less than 2 tons of AC. I will update when I see the submittal. The area of install is inside and not hot but quite dusty. I'll have to impress upon the customer the need for consistent maintenance.
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Looks nice but in the picture there is like 0” of spacing between the drives. I”ll guarantee you the manufactures spec’s will say there needs to be at least 3/4” between each of them. Better hope it works or tech support will point to that as a problem.
 
wireman said:
I believe you need to find the thermal dissipation rating of each drive, normally given in BTU/hr and use it in the heat calculation. Whether you need to use the full amount or not probably depends on if the drive will be running at full load or not.
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That thermal dissipation rating Btu/h is a minimum value given at full load and increases with decrease in load.
 
Sahib said:
That is a bit over 96% for drive efficiency. But remember drive efficiency depends on load. So a customized design of aircon cooling is required in OP case also.
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Or fans and filters.
Which is what we almost always do and have done on drives of up to 6,600kW.
 
wireman said:
Looks nice but in the picture there is like 0” of spacing between the drives. I”ll guarantee you the manufactures spec’s will say there needs to be at least 3/4” between each of them. Better hope it works or tech support will point to that as a problem.
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Some manufactures advertise the fact that their "bookcase" style drives can be mounted side by side as shown in the picture of the panel. I think might be the Emerson/Control Techniques Unidrive range.
 
wireman said:
Looks nice but in the picture there is like 0” of spacing between the drives. I”ll guarantee you the manufactures spec’s will say there needs to be at least 3/4” between each of them. Better hope it works or tech support will point to that as a problem.
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They do look close but drives spec 0mm spacing between. Automation will want some room when in there when they show up in a year or so.b
 
True that drive efficiency decreases as load decreases. But if I'm running the drive at 75% load and efficiency drops to 90%, it stands to reason that I squared R losses would decrease more than the increased losses due to efficiency.

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Some of the AB drives can be mounted next to each other. I suspect that as the people who make the power sections get better at them the people that incorporate those power sections into their drives can make the drives smaller and require less space for cooling. I am still not completely set on the idea of having fans in the heat sinks of a drive. It is just something that will fail but on the other hand it's not like the drive has an infinite life either. I haven't done it in a while but I used to occasionally put fans under drives just to blow air around them in the hopes that it would cool them off a little bit better. Nothing really large just something to move the air around a little.
 
wireman said:
Looks nice but in the picture there is like 0” of spacing between the drives. I”ll guarantee you the manufactures spec’s will say there needs to be at least 3/4” between each of them. Better hope it works or tech support will point to that as a problem.
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Some drives are specified to be ok with no side clearance. The sides are not used as heatsinks, and they will have fans that intake off the bottom and exhaust through
the heatsink towards the top. As for these particular drives, I haven't used them. But many of the AB drives are ok with a layout like this.
 
Besoeker said:
Some manufactures advertise the fact that their "bookcase" style drives can be mounted side by side as shown in the picture of the panel. I think might be the Emerson/Control Techniques Unidrive range.
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FYI Emerson sold the control techniques line to somebody not real long ago maybe a year ago. They were in visiting us the other day pitching their drives. I forget the name of the new company.
 
Aleman said:
Some drives are specified to be ok with no side clearance. The sides are not used as heatsinks, and they will have fans that intake off the bottom and exhaust through
the heatsink towards the top. As for these particular drives, I haven't used them. But many of the AB drives are ok with a layout like this.
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Good to know and I stand corrected. That’s the great things about these forums is the sharing of knowledge.
 
Nidec is the Japanese company that over the years has bought all of the old Emerson Electric product lines, except the Process Control / DCS portion and their HVAC division. So Nidec now owns US Motors, leroy Somer, Control Techniques, the older Emerson appliance motors / fans etc., and the old Emerson Automotive. At one time, Emerson made ALL of the Sears Craftsman electric power tools, that too is now part of Nidec with the rest of it. Emerson Electric is now just "Emerson", no more "electric".
 
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