Hi,

Laser tube is SPT TR90. I have strange problem. When cuting starts everything is ok but then after few minutes less and less laser beam is coming out of tube. None at the end but then out from nowhere it starts to cut again for some seconds and goes off again and so on,..... Current coming to tube is all the time at 18mA. If I stop job with stop on ctrl. panel and start it after a sec then again cuting is ok for sometime. Water temp from chiller(cw-5000) is 20 C. Power supply running ok. Any idea what is going on. Thanx

Best
Mare