Either an electrical problem, or the compressor has tripped on a safety device. Check supply power. Check for errors on display. Check emergency stop is out. Check and reset the overload relay. If it's a new installation, check the phase sequence. [pdf]
A two-stage rotary screw compressor takes in atmospheric air but “shares the work” over two separate compression processes and cools it in between. The difference between the two is not the end result,. [pdf]
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