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Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: Black_Forest on November 06, 2006, 12:41:39 AM

Title: Digital controller: how to programm it?
Post by: Black_Forest on November 06, 2006, 12:41:39 AM

Hi!

I have to use a Honeywell-Mellen controller UDC 3200.
To heat up to 1000°C with 5°/C min.
I was programming as follwing:
SRAMP
Time:250
EU/HR: 8500
GAIN: 60.0

but is is still fast heating ?
Have you any idea how to do it?

Thank you in advance!

Title: Re: Digital controller: how to programm it?
Post by: Donaldson Tan on November 06, 2006, 07:07:32 AM

Is this a Propotional (P), Proportional-Integral (PI) or a Proportional-Integral-Derrivative (PID) controller?

PID should not be used if your input stream has a lot of fluctuations. PID Controllers tend to maximise the extent of fluctuations.

Title: Re: Digital controller: how to programm it?
Post by: Black_Forest on November 06, 2006, 12:35:32 PM

Still I have a problem because I want to set 5^C/min and is very fast heating,
It seems that does not follow the rapm rate.

I was progamming as following:

ENABLE SPRAMP

250
time min

950
final set point

enable
PSRATE

8500
eu/hr up

8500
eu/hr dn

from tuninng
60.0
gain


Thank you in advance,