Eaton Freedom 2100 Installation And Maintenance Manual

Contents

- Page 11 - I.B. 8926-1CONDUITInstall conduit in such a manner as to prevent water fromentering and accumulating in the conduit or the enclo-sure. Eliminate sags in conduit. Have the conduit enterthe motor control center (MCC) in the areas designatedfor conduit entry on the plan views. See pages 30 and31 of this booklet and outline drawings shipped with theMCC. Keeping conduit within the shaded areas shownin the plan views will avoid cable interference with struc-tural members and live bus. (See Part 12.)WIRINGInstall the line and load conductors sized in accordancewith the NEC. Use copper wire only for control ter-minations. Use copper wire only for power termi-nations unless they are marked “CUIAL.” Use con-ductors with a temperature rating of 75°C or higher, butregardless of the insulation temperature rating select thewire size on the basis of 75°C wire ampacity. Using ahigher temperature wire ampacity table often results ina smaller cross-section of copper available for carryingheat away from terminals.Install insulated wire and cable at a temperature suffi-ciently warm to prevent the insulation from cracking orsplitting.When more than one conduit is run from a commonsource or to a common load, be sure to have each con-duit carry conductors from each phase and the samenumber of conductors per phase. If the phase conduc-tors are not distributed uniformly, eddy currents will begenerated in the steel between the conduits.Locate conductors within the MCC to avoid physical dam-age and to avoid overheating. Secure incoming powerlines in a manner adequate to withstand the forces whichwill act to separate the conductors under short-circuitconditions. Use the cable ties furnished in both horizon-tal and vertical wireways to support the load and inter-connection wire. Use a shielded communications cableinside of flexible metal conduit to protect very low volt-age signals transmitted to or from a computer or pro-grammable controller.Lugs furnished with the MCC and its components arefor Class B and Class C stranding. Verify the compatibilityof wire size, type, and stranding with the lugs furnished.Where they are not compatible, change the wire or lugsaccordingly. If crimp lugs are used, crimp with the toolsrecommended by the manufacturer.Use care in stripping insulation to avoid nicking or ring-ing the metal.All field wiring to control units should be made in accord-ance with the wiring drawings that are furnished with thecontrol center. Load and control wiring can be broughtin through the upper and/or lower horizontal wireways.Determine the type of wiring installed in the control center(NEMA Type B or C) and proceed per the appropriateparagraph below.The phase sequence of the power circuit load termi-nals (left-to-right: T1, T2, T3) in units mounted onthe rear side of the MCC is opposite to that of theload terminals in units mounted on the front side ofa back-to-back MCC. To obtain the same directionof rotation for a motor connected to a rear-mountedunit as for one connected to a front-mounted unit,relabel the terminals in the rear-mounted unit: T3,T2, Tl, and wire accordingly. Refer to the warningsticker supplied with rear-side units.When making connections to the load terminals be sureto leave sufficient slack in the wires so that the unit canbe withdrawn to the detent position for maintenance. Seepage 20.NEMA TYPE B WIRINGEach control unit is factory assembled with devicesinterwired within the unit. In addition, all control wiring iscarried to unit terminal blocks mounted on the right-handside of the unit. See Figure 15. Bring the field wiring ofcontrol wires from a horizontal wireway into the verticalwireway on the right-hand side of the applicable controlunit and terminate them at the unit terminal blocks. Bringload wiring from the vertical wireway, under the bottomright-hand side of the unit, to terminations within the unit.See below.ENGAGING PULL-APART TERMINAL BLOCKSThe male portion of the pull-apart terminal block is lo-cated in a plastic bag tied to the pivot rod inside the unit.This terminal block can be wired outside of the verticalwireway. To engage the terminal block, align the fingersof the male connector with the slot at the back of thefemale portion of the terminal block. Then rotate themale portion forward and to the left into the female por-tion of the terminal block.Each male portion of the pull-apart terminal block hastwo cavities adjacent to the. center terminal screw toPART 4INSTALLING CONDUIT AND WIRING