Eaton Freedom 2100, Installation And Maintenance Manual

Page: 20 / 34

- Page 20 -
I.B. 8926-1
1. Before energizing the motor control center (MCC),
conduct a thorough inspection to make certain that
all foreign materials such as tools, scraps of wire
and other debris are removed from all units and the
structure. Remove any accumulation of dust and
dirt 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 may
loosen some of these connections. Check at least 1
0% 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 terminal
blocks. Always check the incoming line connections.
Tighten to the torque values shown in Tables 8-1
and 10-4 (page 27).
3. Remove all blocks or other temporary holding means
used for shipment from all component devices in the
MCC 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 wiring
diagrams which accompany the MCC. Be sure that
each motor is connected to its intended starter.
6. Make certain that field wiring is clear of live busses
and physically secured to withstand the effects of
fault current.
7. Check to determine that all grounding connections
are made properly.
8. Check all devices for damage. Make all necessary
repairs or replacements, prior to energizing.
9. Manually exercise all switches, circuit breakers, and
other operating mechanisms to make certain that
they are properly aligned and operate freely.
10. Test any ground-fault protection systems that were
furnished.
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 shown
on the nameplate of each motor.
13. Install power circuit fuses in the fusible switches in
accordance with NEC application requirements.
Make sure that fuses are completely inserted in the
clips 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 is
PART 8
INSPECTION PRIOR TO ENERGIZING
connected to a load, or a secondary shorting bar is
installed.
15. To prevent possible damage to equipment or injury
to personnel, check to insure that all parts and bar-
riers that may have been removed during wiring and
installation have been properly reinstalled.
16. Conduct an electrical insulation resistance test make
sure that the MCC and field wiring are free from short
circuits and grounds. Do this test phase-to-phase,
phase-to-ground, and phase-to-neutral with the
switches or circuit breakers opened.
17. If the MCC contains a labyrinth vertical bus barrier
system, verify the operation of the automatic shut-
ters. See Part 9 for adjustments of this mechanism.
18. Install covers, close doors, and make certain that
no wires are pinched and that all enclosure parts
are properly aligned and tightened.
19. Turn all circuit breakers and fusible switches to the
OFF position before energizing the bus.