Illustration 2.8 represents mains input, motor, and earthgrounding for basic frequency converters. Actual configu-rations vary with unit types and optional equipment.95130BB920.10+DCBR- BM A I N SL1 L2 L391 92 93RELAY 1 RELAY 299- LC -U V WMOTOR99Illustration 2.8 Example of Motor, Mains and Earth Wiring2.4.4 AC Mains Connection• Size wiring based upon the input current of thefrequency converter. For maximum wire sizes see10.1 Power-dependent Specifications.• Comply with local and national electrical codesfor cable sizes.• Connect 3-phase AC input power wiring toterminals L1, L2, and L3 (see Illustration 2.8).• Depending on the configuration of theequipment, input power will be connected to themains input power or the input disconnect.• Ground the cable in accordance with groundinginstructions provided in 2.4.2 Earth (Grounding)Requirements• All frequency converters may be used with anisolated input source as well as with groundreference power lines. When supplied from anisolated mains source (IT mains or floating delta)or TT/TN-S mains with a grounded leg (groundeddelta), set 14-50 RFI Filter to [0] Off. When off, theinternal RFI filter capacitors between the chassisand the intermediate circuit are isolated to avoiddamage to the intermediate circuit and to reduceearth capacity currents in accordance with IEC61800-3.2.4.5 Control Wiring• Isolate control wiring from high powercomponents in the frequency converter.• If the frequency converter is connected to athermistor, for PELV isolation, optional thermistorcontrol wiring must be reinforced/doubleinsulated. A 24 V DC supply voltage isrecommended.2.4.5.1 Access• Remove access cover plate with a screw driver.See Illustration 2.9.• Or remove front cover by loosening attachingscrews. See Illustration 2.10.130BT248.10Illustration 2.9 Control Wiring Access for A2, A3, B3, B4, C3 andC4 Enclosures130BT334.10Illustration 2.10 Control Wiring Access for A4, A5, B1, B2, C1 andC2 EnclosuresSee Table 2.3 before tightening the covers.Installation VLT®AutomationDrive OperatingInstructionsMG33AM02 - VLT® is a registered Danfoss trademark 152 2