High Operating Current of Screw Air Compressor – Troubleshooting Guide When the operating current of an screw air compressor is high, troubleshoot as follows:1. Voltage Too High or Too LowThe normal voltage is 380V, with an error within 10%.2. Contactor Fails to Close TightlyFor a 50Hz - powered compressor, check if the contact points of the contactor are normal.3. Set