Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual

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Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual Manual pdf 35 page image

SSC = 3 ×RSCE ×Umains ×Iequ = 3 × 120 × 400 ×Iequat the interface point between the user’s supply and thepublic system (Rsce).It is the responsibility of the installer or user of theequipment to ensure, by consultation with the distributionnetwork operator if necessary, that the equipment isconnected only to a supply with a short-circuit power Sscgreater than or equal to specified above.Other power sizes can be connected to the public supplynetwork by consultation with the distribution networkoperator.Compliance with various system level guidelines:The harmonic current data in the table are given inaccordance with IEC/EN 61000-3-12 with reference to thePower Drive Systems product standard. They may be usedas the basis for calculation of the harmonic currents'influence on the power supply system and for thedocumentation of compliance with relevant regionalguidelines: IEEE 519 -1992; G5/4.2.7.7 Immunity RequirementsThe immunity requirements for frequency convertersdepend on the environment where they are installed. Therequirements for the industrial environment are higherthan the requirements for the home and officeenvironment. All Danfoss frequency converters complywith the requirements for the industrial environment andconsequently comply also with the lower requirements forhome and office environment with a large safety margin.2.8 Galvanic Isolation (PELV)2.8.1 PELV - Protective Extra Low VoltagePELV offers protection by way of extra low voltage.Protection against electric shock is ensured when theelectrical supply is of the PELV type and the installation ismade as described in local/national regulations on PELVsupplies.All control terminals and relay terminals 01-03/04-06comply with PELV (Protective Extra Low Voltage) (Does notapply to grounded Delta leg above 440V).Galvanic (ensured) isolation is obtained by fulfillingrequirements for higher isolation and by providing therelevant creapage/clearance distances. These requirementsare described in the EN 61800-5-1 standard.The components that make up the electrical isolation, asdescribed below, also comply with the requirements forhigher isolation and the relevant test as described in EN61800-5-1.The PELV galvanic isolation can be shown in 5 locations(see illustration):To maintain PELV all connections made to the controlterminals must be PELV, e.g. thermistor must bereinforced/double insulated.0.25-22kW1. Power supply (SMPS)2. Opto-couplers, communication between AOC andBOC3. Custom relaysSMPS130BB896.10123aMThe functional galvanic isolation (a on drawing) is for theRS-485 standard bus interface.CAUTIONInstallation at high altitude:At altitudes above 2km, please contact Danfoss regardingPELV.2.9 Earth Leakage CurrentWARNINGDISCHARGE TIMETouching the electrical parts could be fatal - even after theequipment has been disconnected from mains.Also make sure that other voltage inputs have beendisconnected, such as load sharing (linkage of DCintermediate circuit), as well as the motor connection forkinetic back-up.Before touching any electrical parts, wait at least theamount of time indicated in the Safety Precautions section.Shorter time is allowed only if indicated on the nameplatefor the specific unit.Introduction to VLT HVAC Ba... VLT HVAC Basic Drive Design Guide34 MG.18.C2.02 - VLT® is a registered Danfoss trademark22