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Engine not responding in Atlas Copco compressor | Air Compressor Guide
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Engine not responding in Atlas Copco compressor

  • Question Title: Engine not responding in Atlas Copco compressor
  • Asked by: Guest
  • Asked On:
  • Answers: 5

Dear Sir,


We have Atlas Copco compressor XAMS 286 CD , the running hours : 444 , the engine CAT C6.6 ACERT
I need your help to solve my problem which is:
The compressor starts normally and we can load up to 2 bar, but if we increased it more it stops and it gives the below error:


Engine not responding


And I found that once I start without Load , the RPM of the engine is 1300 RPM and once I press the load button, the RPM become 1800 for about 10 seconds then it returns back to 1300 RPM , and when I start increasing the load ,the RPM is fixed to 1300 until I reach 2 bar .once I reach 2 bar ,the RPM goes down immediately .


1- I have checked the line of the fuel completely and changed the fuel and water separator filters but there is no problems inside it, then I run again but the same problem happened again.
2- I have removed the air filters and try to run without it , but still the same problem exists


I bring CAT in Nigeria and they check the engine by computer and the report show that it is very good
I have sent the compressor to Atlac Copco Nigeria but they couldn’t repair it .


So please I need your help


Answers & Replies

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Hi Hany,

Sorry to hear you're having problems with your portable Atlas Copco machine.

I have quite some experience with these machines, as I used to work for Atlas Copco myself.

I've been trying to remember what 'engine not responding' means, and I'm pretty sure it simply means that the engine doesn't reach the correct rpm set point (engine speed) in time.

For example the compressor tells the engine to go to 2000 rpm, but the engine doesn't reach 2000 rpm, or it takes too long, than the error 'engine not responding' is displayed.

This is actually exactly what happens in your case. When you press the load button, the engine should go to maximum rpm, but it doesn't. That's why you get this message.

When the engine stops, or when you load the compressor, does it sound like it tries to work very hard, but can't deliver the power and stalls. Or does it sound like it just idle and stops normally??

Problems like this are always hard to solve. Especially machine equiped with Caterpillar enignes, as everything is electronically controlled and you need special software and passwords for everything!

I know I have dealt with this error before (years ago) and solved it. But I really can't remember anymore.

I searched the manuals and all i could find is that when 'engine not responding' comes up, the machine will shut itself down. So the stopping of the engine is a result of the error message.

It is probably an electrical error, maybe the communication between the Atlas Copco controller and the cat engine is not working anymore (could be a software problem). Sometimes, a software update can fix these kind of issues.

Ask Atlas Copco to contact the guys at the factory (in Antwerp, Belgium). They know how to fix this for sure!!!

What you can try in the mean time is to check all electrical cables and connectors. Try a full reset (disconnect battery, wait a few minutes and reconnect).

Hope you will be able to fix the problems. Let me know how it works out..

Good luck! Sorry I couldn't be of more help.

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After encountering the same problem. And many hours of searching, found wire from turbo to engine computer was broken.

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Thanks, will keep that in mind the next time this problem comes up :)

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Can set point rpm chancge by itself. And were can I get the correct set point of an engine.

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Hi,am having challenge with Atlas copco air compressor,model XAS 756. Power by 3126 CAT. Engine can not reach high RPM. Run at idle and shut down immediately you start from button.If you start from kick starter engine run at idle for long time but will not increase speed. I run diagnosis on engine with cat ET. No active fault code. But on atlas copco monitor I notice ( coolant temperature sensor voltage bellow normal.  I have check the sensor Harness OK. I remove the sensor for replacement. Kindly advice me. 

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