"Andy Hall" wrote in message
...
On Wed, 11 Feb 2004 10:50:15 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Wed, 11 Feb 2004 09:27:32 -0000, "IMM" wrote:

A controller acting on a 3 position actuator would pulse it one way or
the
other (a pulse to not 6 minutes as you mistakingly believe).

I didn't believe that at all, you did.

You said a pulse can be minutes long. Duh!

It can. It can be days or even months. The only criterion is that
it goes on and off.


In short, it
nudges the valve one way or the other to reach setpoint. Some
controllers
can be used with any 3 position actuator of any make. It doesn't need
to
know the speed of the actuators travel.

The L&S one certainly does, and any controller working in this way
will need to know the speed of travel at least approximately, or as a
loop there would be far too much or far too little gain.

I'll let you into a secret. These controllers have adjustments on them.

Some fairly crude ones,

Not so.

and I can read at least as well as you can,

But you have absolutely no experience whatsoever of them.

the difference being that I understand what I read.....

Not so.

Simulated proportional feedback are
more suited to PID controllers.

There is a third type, of actuator, SSB 61. This is a 0-10v
control
type and is able to achieve much greater accuracy because there
is
electronics in the valve head able to monitor the valve position.
I'm using a Sauter equivalent of this product in place of TRV
heads.

A waste of time now, now the cm67z is here.

Not at all. This is but one componen. I'm
already doing what this system does and more.

No, throw it all out and get the cm67z

I don't think so. I am doing some far better things and have some
original ideas that I'm working on. I won't discuss them here
though..

No. You will F**k it up.

I don't think so. Already working and there are some interesting
ideas which are commercially exploitable so I won't be discussing them
here as I said.

Such as what? Electric valves on a rad with a central controller? Not new
at all. The Honeywell RF system is the best in principle as there is no
wiring. Or are you going to sell snake controllers?

Stop trying to be a controls engineer, when you clearly have missed the
basics.

I don't need to try to be anything.
I designed control systems as
an honours degree project

This have moved on since then and you are clearly way behind.

and subsequently
commercially for various
industries for more than 10 years after that.

Who?