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R E L I A G E A R LV M C C LO W V O LTA G E M OTO R C O N T R O L C E N T E R
36
Operation
Preparing for initial operation
In addition to the normal circuit checking after
wiring is completed, the following specific actions
should be taken before energizing the equipment:
1. Check and tighten any electrical connections,
such as lugs and bus splices that may have
loosened during shipment, handling and
installation. Torque values are provided on or
adjacent to components or lugs. See torque
labels in MCC vertical wireway door. Visually
check that all latches on arc-resistant enclosures
are engaged.
2. Operate each magnetic device by hand to verify
that all moving parts operate freely. Check all
electrical contacts for proper operation.
3. Current transformers are shipped with a shunt
across the secondary if the circuit is not
complete. Remove the shunt after completing
the connections to the transformer secondary.
4. Verify that the horsepower and voltage rating of
the motor agree with the rating stamped on the
starter unit to which it is connected.
5. Check each overload heater or electronic
overload relay setting against the motor full-load
current.
Check current transformer-operated overload
CAUTION
relays to be certain that overload heaters are in
place. Do not operate starters without overload
protection.
6. Check all circuit breaker trip settings and fuse
ratings against the drawings supplied with the
equipment.
a. If trip settings must be changed, use the rating
plug extractor tool (catalog number TRTOOL)
to remove rating plugs from Spectra circuit
breakers.
b. See the startup procedure following
information regarding instantaneous trip
settings on magneticonly circuit breakers.
CAUTION
Do not exceed the long-time and/or instantaneous
trip settings stipulated in the National Electrical
Code and as identified in the overload heater
selection tables in this manual.
7. Check all pneumatic or motor-driven
timers for proper time-interval settings.
8. Manually operate all branch-circuit
disconnects and verify proper operation
of disconnects and door interlocks.
9. Where applicable, manually trip all circuit
breakers to verify that operating handles
move freely to the TRIP indicating position.
With the door closed and latched, reset
each tripped circuit breaker by pushing the
operating handle down beyond the OFF
position. The operating handle should move
upward to the OFF position after the breaker
has been reset. After the reset, turn the circuit
breaker ON and then OFF to confirm proper
operation.
10. Visually check all units and enclosures to
ensure that electrical spacings have not been
reduced because of shipping and handling
actions.
11. Verify that the motor control center enclosure
and units are grounded.
12. Replace all protection barriers and panels that
have been removed during installation.
13. Carefully clean the equipment interior with
a clean cloth, soft brush or vacuum cleaner to
remove all metal chips, dust, wire and other
debris.
14. After taking precautions to prevent accidental
contact with the motor control center
buswork, use a 500 Volts megohmmeter to
test the MCC for electrical insulation
resistance test. Open all devices, remove all
instrumentation and control fuses, and isolate
the neutral from ground. All scraps of wire,
plaster, dust, and other foreign material must
be removed. Vacuuming is recommended.
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