VLT ® 2900 Series All about VLT 2900 70 Display readout 71 Warnings/alarm messages 71 Warning words, extended status words and Alarmwords 75 Special conditions 76 Aggressive environments 76 Derating for high switching frequency - VLT 2900 77 Temperature-dependent switch frequency 77 General technical data 78 Technical data, mains supply 3 x 380 - 480 V 83 Available literature 84 Supplied with the unit 84 Index 92 2 MG.29.A3.02 - VLT ® is a registered Danfoss trademark