2 or 4 quadrant?

[lukin1977]

I need to choose a DC Drive to be installed on a horizontal wire spooler (picture attached for reference. not the actual machine).

The machine will be taking up wire feed from a wire drawing machine and a dancer will be installed between both to regulate spooler´s speed

The question is: DC Drive for spooler should be 2 o 4 quadrant?

Thanks!

 

[Skogsgurra]

Looks like you need to brake that one in a controlled manner. And probably quite fast. Especially when there is a wire break at high speed.

If the machine ramps up and down in tens of seconds, you definitely need a four-quadrant drive so you can keep wire tension (acceleration compensation works both ways) constant.

Those two facts. Plus the fact that a four-quadrant drive isn't much more expensive (if at all) than the alternative braking resistor and also produces less heat makes me vote 4 4. No doubt!

I've done that and other spooling/winding machines for decades. Once in a while someone tries a two-quadrant drive. No ovations...

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[lukin1977]

Machine does not ramp up and down very quickly. In fact, ramp up and down is done manually by the operator with a potentiometer for line speed

When wire breaks: the "movable" dancer´s pulley falls down and press a limit switch that desable the drives and applys neumatic disc brakes on both machines

 

[Skogsgurra]

Not very dynamic, then. Use whatever you feel like.

But if the operator wants to keep production up, I recommend 4-q. Otherwise he will have to turn that potentiometer quite slowly.

What brakes are there? Disk brakes?

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[lukin1977]

Yes. Disk brakes.

My question about 2 or 4Q was done because I thought that the selection depend on the type of load and I was not sure what to choose

 

[Skogsgurra]

Ifyou are absolutely sure that you never need to brake electricaly, then you can go with 2-q. But if you see anythig like fast acceleratonor deceleration, in the order of ten-twenty seconds up or down, coming your way, I still say that you are a lot better off with 4-q. And, as I said, it doesnt cost that much and you avoid heat from brakes or braking resistors.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[lukin1977]

ok Skogsgurra
Thank you!