kit for variable speed drive

[Craig Curtin]

Guys,

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to a
Variable speed controller.

Anyone know how this is done or have access to plans ??

Craig

 

[Phil Allison]

"Craig Curtin"

Guys,

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to a
Variable speed controller.

** Using an electronic variable frequency drive has to be the most absurdly
expensive option possible for a water pump.

The smallest model in the Farnell cat costs nearly $1000.




.............. Phil

 

[Craig Curtin]

Sorry maybe i have written this incorrectly then.

My understanding is that for a standard 240v ac centrifugal pump that
by varying the frequency of the cycle will vary the speed of the pump.

I have found reference on the net to a number of solutions for this,
all of which seemed to be "relatively" simple (i am a Newbie to
electronics). However none of them looked as if they would cost $1000
or more ??

What other way would you do this ??

Craig


"Phil Allison" <philallison@tpg.com.au> wrote in message news:<2r7d5rF15kg2nU1@uni-berlin.de>...

"Craig Curtin"
Guys,

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to a
Variable speed controller.



** Using an electronic variable frequency drive has to be the most absurdly
expensive option possible for a water pump.

The smallest model in the Farnell cat costs nearly $1000.




............. Phil

 

[Phil Allison]

"Craig Curtin"

"Phil Allison"

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to a
Variable speed controller.


** Using an electronic variable frequency drive has to be the most
absurdly
expensive option possible for a water pump.

The smallest model in the Farnell cat costs nearly $1000.

Sorry maybe i have written this incorrectly then.

My understanding is that for a standard 240v ac centrifugal pump that
by varying the frequency of the cycle will vary the speed of the pump.

I have found reference on the net to a number of solutions for this,
all of which seemed to be "relatively" simple (i am a Newbie to
electronics). However none of them looked as if they would cost $1000
or more ??

What other way would you do this ??

** I would love to see your "simple" variable frequency drive for a
fractional horsepower 240 volt AC motor. The only ones I know about are full
of high voltage mosfets, uPs and assorted electronic technology.

BTW 1. An electronic interface has to interface to some particular
hing - seems you have the cart firmly in front of the horse.


BTW 2. Top posting is bad usenet manners and very annoying.



............. Phil

 

[Rheilly Phoull]

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:2r84vjF16drdmU1@uni-berlin.de...

"Craig Curtin"
"Phil Allison"

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to
a
Variable speed controller.


** Using an electronic variable frequency drive has to be the most
absurdly
expensive option possible for a water pump.

The smallest model in the Farnell cat costs nearly $1000.

Sorry maybe i have written this incorrectly then.

My understanding is that for a standard 240v ac centrifugal pump that
by varying the frequency of the cycle will vary the speed of the pump.

I have found reference on the net to a number of solutions for this,
all of which seemed to be "relatively" simple (i am a Newbie to
electronics). However none of them looked as if they would cost $1000
or more ??

What other way would you do this ??



** I would love to see your "simple" variable frequency drive for a
fractional horsepower 240 volt AC motor. The only ones I know about are
full
of high voltage mosfets, uPs and assorted electronic technology.

BTW 1. An electronic interface has to interface to some particular
hing - seems you have the cart firmly in front of the horse.


BTW 2. Top posting is bad usenet manners and very annoying.



............ Phil




Prolly be more practical to drive a variable valve on the output of the pump

but it still wont be cheap.

--
Regards ........... Rheilly Phoull

 

[Bushy]

KISS!

Use 2 smaller pumps and a couple of relays!

Or a couple of house water tank pressure pumps in parallel. Scale it up or
down from there to suit your application. If you use a pressure tank, a
pressure switch and a restriction on the outlet you will maintain a pretty
steady flow.

Is there a reason you need to get a more steady flow?

Hope this helps,
Peter

 

[Craig Curtin]

"Bushy" <please@reply.to.group> wrote in message news:<ciofke$r5c$1@bunyip.cc.uq.edu.au>...

KISS!

Use 2 smaller pumps and a couple of relays!

I want to have a continual variable flow based on temperature sensors

Or a couple of house water tank pressure pumps in parallel. Scale it up or
down from there to suit your application. If you use a pressure tank, a
pressure switch and a restriction on the outlet you will maintain a pretty
steady flow.

Starting and stopping pumps is the worst thing you can do for the life
of them

Is there a reason you need to get a more steady flow?

This is a hydronic heating application and by using a continuous flow
some of the issues of thermal bloom can be reduced together with
improving the longevity of the pump by not continually starting and
stopping.

I have been pointed to a NZ site that has a traic that appears to do
what i want for $65 (so much for Phil Allison and his attitude)

I will report back once i hear form the company

Craig Curtin

Hope this helps,
Peter

 

[Jouni Kaukonen]

Bottom posting is annoying. Why would i want to read again all of the
stuff, that the previous has posted? If you need to read it again (if
your memory doesn't work), then read it. I personally find it pretty
stupid to bottom post, since it only leads to scrolling the damn page
down just to see what the next guy answered, thank you very much.

Phil Allison wrote:

"Craig Curtin"

"Phil Allison"

I have a standard 240v AC cicrulating pump which i want to control
from a PIC - i am looking for a kit or plans to interface the PIC to a
Variable speed controller.


** Using an electronic variable frequency drive has to be the most

absurdly

expensive option possible for a water pump.

The smallest model in the Farnell cat costs nearly $1000.

Sorry maybe i have written this incorrectly then.

My understanding is that for a standard 240v ac centrifugal pump that
by varying the frequency of the cycle will vary the speed of the pump.

I have found reference on the net to a number of solutions for this,
all of which seemed to be "relatively" simple (i am a Newbie to
electronics). However none of them looked as if they would cost $1000
or more ??

What other way would you do this ??




** I would love to see your "simple" variable frequency drive for a
fractional horsepower 240 volt AC motor. The only ones I know about are full
of high voltage mosfets, uPs and assorted electronic technology.

BTW 1. An electronic interface has to interface to some particular
hing - seems you have the cart firmly in front of the horse.


BTW 2. Top posting is bad usenet manners and very annoying.



............ Phil

 

[Phil Allison]

"Craig Curtin"

I have been pointed to a NZ site that has a traic that appears to do
what i want for $65 (so much for Phil Allison and his attitude)

** Triacs do NOT vary the AC frequency but merely chop bits off each half
cycle to vary the average torque produced by a motor. If the motor is
loaded fairly heavily, as with a room fan for example, this will cause the
speed to drop to a lower one. However, you do not have actual *speed*
control as you would with a "variable frequency drive".

Beware, a triac "light dimmer" connected to an induction motor can be
risky - at some setting the triac may decide to operate during one half
cycle only effectively feeding DC current to the motor which will BURN IT
OUT.


BTW The poor attitude is all yours.



............... Phil

 

[Phil Allison]

"Jouni Kaukonen"

Bottom posting is annoying.

** Idiot.

Why would i want to read again all of the

stuff, that the previous has posted?

** One breaks the post up and responds to the individual ideas / comments
with replies.


If you need to read it again (if

your memory doesn't work), then read it. I personally find it pretty
stupid to bottom post, since it only leads to scrolling the damn page
down just to see what the next guy answered, thank you very much.

** Obviously you are someone who DOES NOT reply to other peoples thoughts
and ideas individually.

** YOU** insist on posting pompous, irrelevant speeches instead.

Top posting is not a method - it is an arrogant attitude.





............ Phil

 

[Jouni Kaukonen]

Phil Allison wrote:

"Jouni Kaukonen"

Bottom posting is annoying.


** Idiot.

Fuck you too

** Obviously you are someone who DOES NOT reply to other peoples thoughts
and ideas individually.

** YOU** insist on posting pompous, irrelevant speeches instead.

Top posting is not a method - it is an arrogant attitude.

What if i don't need to reply individually dumbass.
You know, logics ain't forbidden in here.

 

[Jouni Kaukonen]

To make things more clear to you:
As i said, what if i had only one question to answer to?
Craig there replied fully correctly.
Really which is more annoying, to see the answer right there or to
scroll down the previous text just to see the answer?
Use your brains and logic.
As far as i'm conserned, you don't need to reply, just think for a
minute there.

 

[Phil Allison]

"Jouni Kaukonen" <jok.er@roskaa.excite.com> wrote in message
news:sOg4d.237$1U2.111@reader1.news.jippii.net...

Phil Allison wrote:
"Jouni Kaukonen"

Bottom posting is annoying.


** Idiot.

Fuck you too

** Point proven.

** Obviously you are someone who DOES NOT reply to other peoples
thoughts
and ideas individually.

** YOU** insist on posting pompous, irrelevant speeches instead.

Top posting is not a method - it is an arrogant attitude.


What if i don't need to reply individually dumbass.

** So YOU** insist on posting pompous, irrelevant speeches instead ???

You know, logics ain't forbidden in here.

** A foreign idea to you.



............ Phil

 

[Phil Allison]

"Jouni Kaukonen"

To make things more clear to you:
As i said, what if i had only one question to answer to?

** Then post under that question - trim it to its essentials if you like.

Craig there replied fully correctly.

** Nope - he rudely top posted.

Really which is more annoying, to see the answer right there or to
scroll down the previous text just to see the answer?

** Questions come first - answers second.

Horses first - then carts.

Use your brains and logic.

** Time for you to try that sometime.

As far as i'm conserned, you don't need to reply, just think for a
minute there.

** Top posters are mentally defective - they cannot be see that they are
are out of step and so WRONG.





............. Phil