VLT ® 2900 Series Electrical installation, control cables chassis by means of a clamp. Normally, the screen must also be connected to the chassis of the control- ling unit (use the instructions for the unit in question). In connection with very long control cables and ana- logue signals, in rare cases depending on the instal- lation, 50/60 Hz earth loops may occur because of noise transmitted from mains supply cables. In this connection, it may be necessary to break the screen and possibly insert a 100 nF capacitor between the screen and the chassis. Control cables must be screened/armoured.
The screen must be connected to the frequency converter Installation MG.29.A3.02 - VLT ® is a registered Danfoss trademark 67