Pre-Operational Check List
To insure proper operation of the motor control
center the items listed below should be checked
Complete maintenance procedure M-1
through M-36 starting on p 14. This initial
maintenance is complete.
Perform insulation test on the motor control
center (maintenance procedure M-37, p 23).
3 . If the motor control center is equipped with
ground fault protection, this should be
adjusted properly before energizing.
All blocks or other temporary holding means
should be removed from the electrical
secondary shunt bar removed. Do not
operate a current transformer
secondary open circuited.
breakers, and other operating mechanisms
to make sure that they are properly aligned
and operate freely.
Electrically exercise all electrically operated
determine that the device operates properly.
An auxiliary source of control power may be
Timers should be checked for the proper
interval and contact operation.
Check overload selection tables against
motor full load current to insure that proper
overload units have been installed.
10. Make certain all load and remote control
connections have been made and agree with
wiring diagrams provided.
11. Make certain that all ground connections are
12. Install covers and close doors and make
certain all are properly tightened.
WARNING- Energizing a motor control center for the first
time is potentially dangerous. Therefore, only
equipment If faults caused by damage or poor
installation practices have not been detected in
the checkout procedure
damage and/or personal injury can result when
the power is turned on.
In order to minimize risk of damage and/or injury,
there should be no load on the motor control
center when it is energized Turn off all of the
downstream loads, including those such as
distribution equipment and other devices which
are remote from the motor control center The
equipment should be energized in sequence by
starting at the source end of the system and
working towards the load end In other words,
energize the main devices, then the feeder
devices and then the branch-circuit devices With
barriers (if applicable) in place and unit doors
closed and latched, turn the devices on with a
firm positive motion. Protection devices that are
not quick-acting should not be "teased" into the
closed position. After all disconnect devices
have been closed, loads such as lighting circuits,
starters, contactors, heaters, and motors, may
be turned on.
The disconnect can be padlocked in the OFF
position with unit door open or closed with up to
three padlocks The door can be opened with the
disconnect padlocked but the disconnect cannot
be forced closed For an application which
requires the disconnect to be padlocked in the
ON position, a blind hole, provided in the upper
part of the pivot housing, con be drilled through
to allow insertion of the padlock.