Slow on / off Voltage Regulator - HELP !

[ceolwynn]

Hi,
Here is a circuit I found for a Slow-On , and
my questions for the mods I seek ...

I have a 20Amp 24v DC Motor a : Dayton
Model 6ML03 ,,, and to drive it I have a Dart
Model 65E40 DC Powered Motor Controller.

This motor Controller needs a .5 -to- 10v DC
Signal to run my motor Between 30% and 100%.

Here is the manual for the controller describing
the Variable speed input pins ... Pg 4 , Specs
Chart line 2, and Page 6 Schematic showing
pin P2-2 Pin as the variable voltage input pin,
( The Wiper Pin when Using the TrimPot

The Manual is on the dartcontrols dot cahm
web site... the file is 65EMANUAL.pdf if
interested in helping.

I have used capacitors as short term power
sources once or twice in some hobby kits long
ago but cant find those schematics anymore *sigh*.

so I tried this circuit here, but can't get the 3
seconds right. and...

?? should I use a Mosfet to get a more Linear ramp ?
J-fet ? ???

and I know how to hook up a large cap to short-term
Power the LM317, but what is the reverse of this
"Ramp-Up" circuit ?

The same setup but in place of resistor R2 ? R1 ?

any ideas ?

// Tom \\

 

[Resqueline]

I'm sorry but I'm having a hard time understanding your goal/problem.
What are you trying to do with the motor/controller that it doesn't want to do by itself?
What's this thing about big caps?
What's the LM317 for?

 

[ceolwynn]

I'm sorry but I'm having a hard time understanding your goal/problem.
What are you trying to do with the motor/controller that it doesn't want to do by itself?
What's this thing about big caps?
What's the LM317 for?

The LM317 has always been for "outputing a variable Voltage"
or so I thought ? it could have applications other than that I may
not be aware of though... but in this instance it is for "Outputing
a variable Voltage" ...

I do not understand your question
What's this "thing" about big caps ?

you will have to be more specific than "thing".

I suspect that you didn't look at any of the attachments that my post
mostly refers to. there was lots of information in those attachments I
referred to, that is why I attached them

but here is some text you missed in the attachments.
But this text makes less sense without the schematic next to it.

<<< From Attachment # 1 >>>

I can Supply "this" circuit with 14v DC...
I need the output to swing from very small
.5v DC -to- 10v DC in 3 seconds ??
Will that be possible ?

The 2nd goal is even harder for me to find.
Using a big capacitor for storage, How can I
make this a "Soft-Off" after Power Kill ?
I need botht you see... .5 -to- 10 volts in 3
Seconds, and at Power off, 10v -to- .5 v
in 3 Seconds

I know your heads are shaking but the
output is for a control signal only !! maybe
need about 20 ma ... it is to control a Dart
65E40 Controller.

I think it will take 2 capacitors for the
"Soft-off", 1 for the LM317 , and one for
the reverse of the Transistor / Capacitor
setup in this version for "Soft-on" right ?

< < < that is the text next to the schematic this
post is about, in attachment # 1 > > >

what the controller doesn't want to do by itself,
is run it's own 0 -to- 10v speed control input. so I
have to set that up myself

hope that clears things up a bit ?

I hope not everyone ignores 4 attachments
and then responds to a post ! *grin* if so this
could result in lots of uneccesary repetition ?

regards !!! // Tom \\

 

[Resqueline]

I did look at your attachments in detail, and you include very much detail exept for the most basic; how do you want the motor to behave, what is the intended use.
The way you present it makes it hard though to distinguish between your real issue and your ideas about how to solve it.
The only thing I understand about your needs is a 3 second time constant in motor drive current, and that is already taken care of in the motor driver itself. So, educate me.

 

[neon]

first of all you need a diode across the lm117 otherwise poof. what you are tying to do must come from the input unless or you remove the load there is never going to be a long time shut off how can it be? where does the decay power will come from? there are 5 v caps 1/2 " into the farads add them up to get the voltage charge. or remove the load nothing circuit wise is going to make do that otherwise