Eaton 75VCPW-VSR Instruction Book

Contents

22Instruction Book IB02707112EAugust 201550/75VCPW-VSRBreaker To Vacuum Starter Replacement UnitEATON CORPORATION www.eaton.comFigurt 6.7. RtmNvt oht CNil MNunoing Anglt6.6 MECHANICAL LATCH6.6.1 LATCH REMOVAL1. Remove latch control wires from terminals 7 & 8 on contactor oilcontrol board.2. Remove the four 8mm x 1.25 bolts from the underside of thebase plate that secure the latch assembly to the base plate.3. Remove the two 6mm x 1.0 bolts from the front of the contactorthat secure the roller bracket assembly to the armature plate.Tablt 6.1. Unlaoch CNil ImptdanctCoil Volts Impedance24 0.77 - 0.9548 2.95 - 3.55110 / 120 / 125 10.97 - 11.19220 / 240 44.57 - 54.57COIL CHECKOUT AND REPLACEMENTIf the contactor fails to open when the unlatch coil is energized, thecoil may be faulty. To determine if the coil has the proper resistance,connect an ohmmeter across the coil leads where they areconnected to the bridge rectifier. Refer to Table 6.1 for the correctimpedance for the different voltage coils.If the coil impedance is not within the range in Table 6.1, it must bereplaced. Follow the steps below for replacement.1. Remove latch control wires from terminals 7 & 8 on contactor coilcontrol board.2. Remove the four 8mm x 1.25 bolts from the underside of thebase plate that secure the latch assembly to the base plate.3. Remove latch coil retaining bolt (8mm x 1.25), Figure 6.14, andremove all components secured by this bolt.4. Remove the 4mm x .7 screw securing bridge diode to latch coilbracket.5. Remove old coil from core.6. Insert coil core into new coil, insuring rubber gasket is betweencore and coil bobbin.Figurt 6.8. RtmNvt oht LNckNuo Stcuring oht Rtourn Spring BNloFigurt 6.9. Unscrtw oht Rtourn Spring AsstmblyFigurt 6.10. Insoall Ntw CNils Nn CNrtsFigurt 6.11. SoNp Asstmbly Adjusomtno BlNck