Atlas copco GA75 separator temp raises to 225ºF,few minutes after it start?

by daniel
(el paso, Tx)

screwed air compressor GA75 ,separator temp raises to 225ºF,few minutes after it start; I checked oil level ,Ok,I cleaned "combicooler", Ok; room temp around 80ºF always;I need to know whatelse I have to do to fix it?

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Nov 10, 2012
Thermo valve - fixed!
by: daniel

thank's Carl421 , that was the problem I changed & it's working now.

Nov 09, 2012
Thermo valve?
by: Carls421

You have done everything right so far, the next thing to check is the thermo valve, try replacing that then let me know how it goes. Do you have the user manual or parts manual?
____________
Thanks, Carl

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GA75- tripped on motor overload

by Amusa Asimiyu Olatunde
(Ewekoro Ogun,Nigeria)

ATLAS COPCO COMPRESSOR (GA75) - tripped on motor overload

My compressor sometime tripped on motor overload,what are the likely things you suggest can be causing it.

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May 26, 2016
troubleshoot
by: Sabastine

I have Alas copco GA 708,it goes off after after 30 seconds, what could be the fault, and how do I fix it please?

(Please start a new thread. Thank you. - Moderator)

Dec 19, 2014
GA75 TRIPPED ON MOTOR OVERLOAD
by: Anonymous

check your compressor/motor bearings condition.

Mar 04, 2014
GA 75 overload trip
by: Wayne pps

Check all 3 phases voltage and amps if clipped and close to setting on overload within 5amp the overload may require upping in stages of 5amp , FLC x 0.58 is a starting point,

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atlas copco ga250 - shutdown temperature problem

by hadi esmaeili
(shiraz.fars.iran)

hi
atlas copco ga250 aircooled: the outlet element 1 temp of this comp decrease after starting and recived to the shatdown temp(110 deg centigrade).changed oil filter and cheked the actuator and check all sensors and thermostat all of them have not any problem.what part remain to checking???thx a lot

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Water accumulation in screw compresor?

Atlas Copco Model GA 30 flow diagram

Atlas Copco Model GA 30 flow diagram

Dear Bill, I am writing from an offshore installation in Nigeria.

We have an Oil injected rotary screw air compressor make Atlas Copco, Model GA 30+. It has run for 3700 hours till date without a problem.

Today while performing our daily checks we noticed lot of oil drained from the auto condensate valve. We also noticed that oil level was higher than normal.

We drained the oil and collected more than 5 litres of water mixed with oil.

We are unable to find the reason for this problem. The only reason I can think of is rain water ingress through air intake as it has been raining heavily for the past four weeks. Could you help us on this please? I have attached a picture of the model along with its flow daigram.

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Sep 21, 2012
Water accumulation in screw compressor
by: Prabhakar raju

Carl,

Thanks for your valuable support. This Compressor supplies instrument air for our plant and maintains 110 psi in the header. It cuts in at 108 psi and cuts off at 125 psi.

As you mentioned in your question # 3, the run on period appears to be the root cause for the moisture accumulation. The normal run on period for this Unit is less than 3 minutes. While investigating the problem we just found out that last week the compressor was run with cut in pressure setpoint increased to 118 psi. This caused the already less ‘run on’ time to reduce further while operating between 118 & 125 psi. Temperature of compressed air may not have gone above the desired 160 F during this period causing moisture accumulation.

We have now restored the settings back to 108 psi and kept the Unit in observation. Thank you so much Bill for your support.

Sincerely,

Raju

Sep 21, 2012
Clarification
by: Carls421

Hi,
I have just seen this and thought I would try to help you, I am an air compressor service engineer in England and work on screw compressors from day to day.

I have a few questions for you regarding your problem.

1. How often is your compressor ran for? ie, is it allowed to get up to operating temperature? (Around 75oC - 95oC) If it is only ran for a few minutes before switching off, then the oil may not be allowed to get up to temperature to burn off the ingress of water which happens with any oil lubricated machine (Same as a car which only goes to the shops once a day)

2. How old is your machine? The GA30 has been manufactured since the 80s i believe, and has been updated a few times. The serial number should tell me the age of the machine, so if you have that, then it would be helpful

3. Are all the panels still fitted to the machine? Water is unlikely to be going into the air intake if these are all fitted.

The most likely cause of the excess water issue, judging from what you describe, would be that it may not be getting up to temperature, as stated above. This can be resolved by adjusting the settings and allowing the compressor "Run on" time to be extended, or every week as a temporary measure to see if it resolves the issue, to run the compressor and use the air continuously for about an hour (either by safely keeping open a valve in the line, or working your machines harder than normal, just to keep the compressor working harder.

Do you have a user manual for the machine?

I hope some of the above is helpful to you, If you could comment on this thread as with your answers to the questions, i would love to hear how you get on.

Kind Regards

Carl
_______________
Carl, thanks so much for your input. I hope the original poster will come back with answers for you, as the thread will be useful to all.

Cheers,

Bill


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