Danfoss VLT FC Series Operating Instructions Manual

Also see for VLT FC Series: Service guide Installation instructions Installation guide Installation instructions Operating guide

Contents

Danfoss VLT FC Series Operating Instructions Manual Manual pdf 9 page image

1.5 Switch Mode Power Supply (SMPS)The VFD’s logic circuitry is backed up by an independentpanel-mounted switch mode power supply so that, even ifthe drive loses power, the control and communicationfunctions are maintained. The SMPS converts three-phaseAC input power to 24 VDC control power. Since the SMPSdraws power from all three phases, it offers immunityprotection from most phase-loss and brown-outconditions. The SMPS is internally protected from shortcircuit on its output and three board-mounted fusesprovide additional protection. The SMPS is not designedfor external use and may take up to 5 s to initialize atpower-up.1.6 Disconnects1.6.1 Main DisconnectThe main disconnect removes line input power to thedrive and bypass. A main disconnect is available in fouroptions.• Fused disconnecttwo-position (ON/OFF) rotary switch, padlockcompatible, with three fuses, one on each phase,built into the switch. For safety, the switch mustbe in the OFF position before the option paneldoor can be opened• Disconnect with fusesTwo-position (ON/OFF) rotary switch, padlockcompatible, with a fuse block mounted separatelyfrom the disconnect. Three fuses, one on eachphase, are located on the fuse block. For safety,the switch must be in the OFF position beforethe option panel door can be opened.• Disconnect without fusesFor user-supplied fuses option.• Main circuit breakerA thermal/ magnetic current interrupt deviceusing an ON/TRIP/OFF/RESET switch. When in theON position, a trip fault removes power from thedrive/bypass circuit and the switch moves to theTRIP setting. It must be moved to the RESETposition momentarily after the fault has beencleared to reset the circuit breaker.1.6.2 Drive Disconnect (Optional)Two-position (ON/OFF) rotary switch disconnects main ACline input power to the drive only.1.6.3 Bypass Selector SwitchThe bypass selector switch is used for either the 2-contactor or 3-contactor bypass for EMB units.3 21 130BX208.10OFFMOTORDRIVE DISCONNECTBYPASSIllustration 1.3 Disconnects1 Bypass selector switch2 Main disconnect3 Drive disconnectTable 1.3 Legend to Illustration 1.3Introduction Option Panel Operating InstructionsMG14I102 - VLT® is a registered Danfoss trademark 71 1