Technical descriptionItem no. 10302178, Revision 0212 ( 40 )5 Technical description5.1 Connections of HF spindle7 1 31 Electrical connection3 Sealing air G 1/8"7 Pneumatic system for tool change G 1/8"5.2 Electrical connectionThe HF spindle may only be operated with a frequency converter (FC).Ü Check whether the current, voltage, and frequency data of the HF spindlematch the raw data for the frequency converter.Ü Use a motor supply line that is as short as possible.Ü Adjust the speed of the HF spindle using the FC.Ü Refer to the frequency converter manual for further information.The FC detects the following operating states of the HF spindle, depending onthe version:q HF spindle rotating.q HF spindle too hot.q HF spindle at a standstill, etc.The FC forwards the operating states of the HF spindle to the machine con-troller.