Eaton Freedom 2100 Installation And Maintenance Manual

Contents

- Page 20 -I.B. 8926-11. Before energizing the motor control center (MCC),conduct a thorough inspection to make certain thatall foreign materials such as tools, scraps of wireand other debris are removed from all units and thestructure. Remove any accumulation of dust anddirt with a vacuum cleaner.2. All circuit connections are tightened at time of as-sembly by power-driven tools with controlled torque.However, the vibrations experienced in transit mayloosen some of these connections. Check at least 10% of the total connections for a tight connection.Should this spot-check reveal some loose con-nections, it will be necessary to check all con-nection points. The connections to be checked in-clude bus hardware, circuit breaker and switch ter-minals, contactor and relay terminals and terminalblocks. Always check the incoming line connections.Tighten to the torque values shown in Tables 8-1and 10-4 (page 27).3. Remove all blocks or other temporary holding meansused for shipment from all component devices in theMCC interior.4. Check the enclosure to see that it has not been dam-aged so as to reduce electrical spacings.5. Compare all circuits for agreement with the wiringdiagrams which accompany the MCC. Be sure thateach motor is connected to its intended starter.6. Make certain that field wiring is clear of live bussesand physically secured to withstand the effects offault current.7. Check to determine that all grounding connectionsare made properly.8. Check all devices for damage. Make all necessaryrepairs or replacements, prior to energizing.9. Manually exercise all switches, circuit breakers, andother operating mechanisms to make certain thatthey are properly aligned and operate freely.10. Test any ground-fault protection systems that werefurnished.11. Set any adjustable current and voltage trip mecha-nisms to the proper values.12. Ensure that overload relay heater elements are in-stalled and selected to the full-load current shownon the nameplate of each motor.13. Install power circuit fuses in the fusible switches inaccordance with NEC application requirements.Make sure that fuses are completely inserted in theclips provided. Do not attempt to defeat the rejec-tion feature on the fuse clip, when provided.14. Do not operate a current transformer with its sec-ondary circuit open. Insure current transformer isPART 8INSPECTION PRIOR TO ENERGIZINGconnected to a load, or a secondary shorting bar isinstalled.15. To prevent possible damage to equipment or injuryto personnel, check to insure that all parts and bar-riers that may have been removed during wiring andinstallation have been properly reinstalled.16. Conduct an electrical insulation resistance test makesure that the MCC and field wiring are free from shortcircuits and grounds. Do this test phase-to-phase,phase-to-ground, and phase-to-neutral with theswitches or circuit breakers opened.17. If the MCC contains a labyrinth vertical bus barriersystem, verify the operation of the automatic shut-ters. See Part 9 for adjustments of this mechanism.18. Install covers, close doors, and make certain thatno wires are pinched and that all enclosure partsare properly aligned and tightened.19. Turn all circuit breakers and fusible switches to theOFF position before energizing the bus.