VLT ® 2900 Series VLT 2900 Operating Instructions Software version: 1.0x These Operating Instructions can be used for all VLT 2900 Series frequency converters with software version 1.0x. The software version number can be seen from parameter 640 Software version no . Introduction to VLT 2900 MG.29.A3.02 - VLT ® is a registered Danfoss trademark 5