Re: Solution repository
- From: "David Corliss" <dcorliss@xxxxxxxx>
- Date: Mon, 8 May 2006 06:34:40 -0500
You should be able to achieve a closed loop position controller if you only
have a position sensor. Think in terms of a scaled step input, a unity
feedback loop, and the position output reaching the desired location
according to the dominant system time constant. I'm not certain that a PLC
would be useful here. You would have to know some basic characteristics of
the hyddraulic actuator. However, your overall performance would improve.You
should be able to achieve zero position error, in much less time.
"Lee Russell" <me@xxxxxxxxxxxxxxxx> wrote in message
news:douj529k4ja94ag2kilsr6gurodbi0df5o@xxxxxxxxxx
Hello Everyone
I have recently been given a relatively simple control problem to deal
with. It could be summed up as a problem where a rotary hydraulic
motor was moving something into position and I had feedback from a
rotary encoder as to that position. The motor and encoder I/O was fed
from and into a Wago PLC. I ended up using an open loop type
solution, where the speed of the motor depended on the distance I was
from the position setpoint and then eventually stopped the motor at a
specified distance away from the setpoint. I have called this OL
because I am not reading back the motor speed, I just change the speed
and wait for the system to reach the next position for a speed change.
This method has worked every time I have run it. I would be grateful
for comments on this solution, but this is not really the purpose of
this post.
While trying to solve this, I started thinking "I can't be the first
person to do this". So I searched for an online repository of
standard solutions to simple problems. Or simple control methods
based around kinds of equipment used. Does anything like this exist
or would it be impossible?
Thanks, looking forward to some interesting discussion
Lee Russell
.
- References:
- Solution repository
- From: Lee Russell
- Solution repository
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