80459-641-01E Model 6 Motor Control Centers
10/2012 Section 5—Operation
© 1999–2012 Schneider Electric All Rights Reserved
53
ENGLISH
Section 5—Operation Included in this section are the pre-operation checklist and energizing
procedures.
Pre-operation Checklist To ensure proper operation of the MCC, check the items listed below before
energizing the MCC:
❏ Complete the maintenance procedures beginning on page 55 and
continuing up to “Insulation Test” on page 66. This initial maintenance is
necessary to detect any shipping damage or loose connections. Do not
energize the MCC until initial maintenance is complete.
NOTE: The following maintenance procedures are not necessary before
energizing the MCC for the first time: Control Unit Removal, Stab
Assemblies, Starter Contacts and Barriers/Insulators.
❏ Perform an insulation test on the MCC (see “Insulation Test” on
page 66).
❏ If the MCC is equipped with ground fault protection, properly adjust and
test the ground fault protective device before energizing.
❏ Remove all blocks or other temporary holding means from the electrical
devices.
❏ Remove any secondary shunt bars from the current transformers. Do
not operate a current transformer with its secondary open-circuited.
❏ Manually exercise all switches, circuit breakers, and other operator
mechanisms to ensure that they are properly aligned and operate freely.
❏ Electrically exercise all electrically-operated switches, circuit breakers
and other mechanisms (but not under load) to ensure that the devices
operate properly. An auxiliary source of control power may be required.
❏ Verify proper interval and contact operation of the timers.
❏ Verify that proper overload units are installed by checking the overload
selection tables against motor full load current. Motor Logic, TeSys™ T,
and IEC overload relays (if supplied) do not require thermal units, but
are set at the lowest setting at the factory.
❏ Verify that all load and remote control connections have been made and
that they agree with the wiring diagrams provided.
❏ Verify that all ground connections are made properly.
❏ Install the covers and close the doors; ensure that all fasteners are
properly tightened; verify that all mechanism interlocks function.
For arc-rated applications:
❏ Verify that lifting angles have been removed from all sections in the
line-up.
❏ Verify that the proper top plate assembly has been installed per the
provided instructions.
❏ Verify that over-current protection device (OCPD) settings meet the
requirements outlined in this document before applying power.
❏ Verify that the required clearances from obstructions above and around
the equipment have been met per the requirements outlined in this
document.
Figure 68: Pre-operation Check
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