Firstly, check if the screw air compressor machine automatically stops working properly; Then check if the automatic switch and thermal relay are working, if they cause the cooling fan motor to stop, or if the exhaust temperature is too high or the pressure is too high, and if the motor voltage is normal.
[pdf] Checkout Current Transformers (CTs) and check resistance across each one while it is disconnected. All resistances should be within 10% of one another. Also do a diode test on the CT inputs on each compressor module. (The diode test is described in RTAA-SVB10B-EN.)
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