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Thread: Frick Screw Control?
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23-05-2012, 02:53 AM #1
Frick Screw Control?
I work at a large industrial facility with 5 Frick RWF 11 270 ammonia compressors. We have various loads depending on product runs and sometimes we might have a couple of compressors only loading 20 or 30 percent. These compressors are connected for sequencing but you have very little control over minimum slide position and therefore we are not loading up evenly. Anyone have any advice on this control or using PLC logic?
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23-05-2012, 04:41 AM #2
Re: Frick Screw Control?
What kind of PLC do you have? Usually, all compressors should operate at 100% load except last one in the sequence. Last compressor should load and unload to handle fluctuation of the refrigeration loads. Actually, Frick compressors have set point of minimum load. You can choose whatever you what.
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23-05-2012, 09:16 AM #3
Re: Frick Screw Control?
Doesn't the Quantum's unit controls allow to manage the compressor sequencing? It seems weird if not...maybe it is not properly configured.
I'm not familiar with Quantum but rather with the UNISAB. The UNISAB allow it.To make progress is never good enough, I want to do better and better and better
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23-05-2012, 11:27 AM #4
Re: Frick Screw Control?
We have Allen Bradley PLC but it is not configured to control the compressors. I will look at the book today but was not familiar with the sequencer.
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23-05-2012, 11:42 AM #5
Re: Frick Screw Control?
So the compressor aren't eqquiped with the Quantum unit controler?
To make progress is never good enough, I want to do better and better and better
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07-06-2012, 12:18 PM #6
Re: Frick Screw Control?
hello david..see if the set points of these compressors are the same..if so try to stagger them meaning that keep the set points apart from eachother in an ascending manner..
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07-06-2012, 08:29 PM #7
Re: Frick Screw Control?
Hi, daviddsims
This is the problem with PLC's which are not designed and configured to operate refrigeration compressors ... it is quite cheap PLC control with high electric bill ....
This is very good advice, each compressor will start or went off independently and you will have less compressors running simultaneously at small load ... anyhow, you must play with timers to obtain slow capacity change i.e. avoid hunting ...
Best regards, Josip
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08-06-2012, 12:12 AM #8
Re: Frick Screw Control?
We control our Fricks with an Allen Bradley Compact Logix PLC. It works very well. Does anyone know anything about a Frick alarm "False Running Inp"?
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08-06-2012, 02:34 AM #9