Eaton 9E6Ki User Manual

Contents

Page 103.3 Connection3.3.1 I NSTALLATION REQUIREMENTSWarning:Installation must be performed by qualified personnel. The first connection to perform is the protective conductor (earthcable), which must be connected to the screw marketed .The UPS, when inserted in an installation, does not alter the existing neutral (system earthing) arrangements.A differential switch upstream will also be triggered for a fault occurring downstream of the UPS. In calculating reactivity of thisswitch, account must be taken of the leakage current of the UPS (approx. 8 mA) plus that of the load which come together on theUPS’s earth conductor.UPS input Differential switchSingle-phase Type B or Type AThree-phase Type BThe neutral arrangements are altered only if there is an isolating transformer or when the UPS operates with a neutral that isdisconnected upstream.In any case avoid connecting the output neutral with the input neutral or to the earth as this could damage the UPS.Reminder : The UPS needs a neutral connection to work properly. Operation without Neutral may damage the unit.For installation with change in system earthing arrangement or galvanic isolation see below schematicFig.3-1 Change in SEA or Galvanic isolationNotice: It is required to install an external isolating device against current backfeed between Mains input and UPS. After the deviceis installed, it must add a warning label with the following wording or the equivalent on the external AC contactor: RISK OFVOLTAGE BACKFEED. Isolate the UPS before operating on this circuit, then check for hazardous voltage between all terminals.The current rating of T - AC contactor should be more than 1.3 times of UPS capacityFig.3-2 Typical external isolating device installationSingle phase input Three phase input