Thread: VSD enclosure

Originally Posted by Stustoys

I will be cleaning it up.

I hope so...its looks ruddy awful as it is...lol

Better?

Originally Posted by Stustoys

Better?

ARGH!!!!!!!!!!!
Assume nothing!!
Finished the wiring on the shaper this morning. Upped the Max Freq on the inverter to 60Hz, set the jog speed to 50Hz. Switched from mill(with 60hz displaying on the VSD) to the shaper, 50Hz comes up just like it should. Patting myself on the back, very pleased with myself.
Then I turn the speed pot....... nothing, its overridden by the jog control. This is not what I thought would happen. I'd thought the speed control would still work up to the maximum set by the jog speed. So this set up wont work.

The new plan is this. I only have two wires and they will be switched at the machine. So the diagram of the switches isnt really correct, I'll work on it.
All pots 10k

Ok I think this is more like it.
The replys are in the machine control boxes.
The idea of the parallel pot on the machine is that one can be set to limit the max rpm amd locked, the other is then used to varie the rpm.
Will it work??

Stuart

Originally Posted by Stustoys

Will it work??

Stuart

Ah Ah ...I get it...if it doesnt you'll have some one else to blame and chase up for your loss...gee yor smart...lol

Originally Posted by Stustoys

Will it work??

Stuart

I am assuming that you have drawn the last diag as "live" on the Max Speed circuit (not the variable)......if its not alive its not going to work as when you power it up that relay will switch to what is now the NO contact and you wont have any power at the VSD......

if the former is true...you've drawn it wrong as the circuit should not be drawn as live

Ok I see what you are saying. I've drawn it as it would be if it was pluged in and the machines were on. I'll fix it.


Done. Of course the max speed of machine A can only be lower than machine B.

Originally Posted by eskimo

Ah Ah ...I get it...if it doesnt you'll have some one else to blame and chase up for your loss...gee yor smart...lol

Hi Stuart,

No it won't work, at least not the way you want. You can't just parallel up the pots like that. You have to switch the pot wipers. I think I drew a cct earlier?

I guess eskimo get's the blame, right?

Regards
Ray

PS.. Found it, it was earlier in this thread..

But I am switching the wipers(at least that is my intent, even if the diagram doesn't show it).
I'll draw a simpler version of what I am after.

Hows this?

P.s. I may not have been clear in my earlier post. I only have two spare wires in the cable. Otherwise I would switch all three and be done with it.

Assuming my idea isn't complete rubbish
I've removed one of the poles on each of the relays.
Stuart

Hi Stuart,

I've got to go out for a few hours, I'll draw a circuit for you later tonight, but I'll quickly describe what you need..

First, wire up the max speed pot across the 0-10v supply, that gives you 0-10v on the wiper of that pot. That's your maximum speed. say it's set somewhere at XX volts

Now take that 0- XX v signal and wire it across the second pot, (the wiper from the max speed pot, goes to the top of the speed pot) that gives you an adjustable 0- XX volts signal that goes to the drive...

Regards
Ray

Omg I've assumed again, I thought it was the max resistance I needed to limit. I was wrong its the minimum resistance I need to limit. So here is Version 5 lol

Will this one work? I think this is part of what you mean Ray

I assume the resistance 10V-MVI being a little high wont be a problem?


I've just had another thought. I could forget the "max rpm set" and just limit the rotation of the variable rpm pot to limit rpm. Ver 6

Stuart

p.s. "simpler version of what I am after" this was of course for my benefit!