Maintenance - Eaton Freedom 2100 Installation And Maintenance Manual

PREVENTIVE MAINTENANCE
Preventive maintenance should be a program, a sched-
uled periodic action that begins with the installation of
the equipment. At that time, specific manufacturer's in-
struction literature should be consulted, then stored for
future reference. Follow-up maintenance should be at
regular intervals, as frequently as the severity of duty
justifies. Time intervals of one week, or one month, or
one year may be appropriate, depending on the duty. It
is also desirable to establish specific checklists for each
control, as well as a logbook to record the history of inci-
dents. A supply of renewal parts should be obtained
and stored.
This control equipment is designed to be installed, oper-
ated, and maintained by adequately trained workmen.
These instructions do not cover all details, variations, or
combinations of the equipment, its storage, delivery, in-
stallation, check-out, safe operation, or maintenance.
Care must be exercised to comply with local, state, and
national regulations, as well as safety practices, for this
class of equipment.
Authorized personnel may open a unit door of a motor
control center (MCC) while the starter unit is energized.
This is accomplished by defeating the mechanical inter-
lock between the operating mechanism and the unit door.
A clockwise quarter-turn of the slotted head screw lo-
cated above operating handle will allow the door to open.
See Figure 33.
When servicing and adjusting the electrical equipment,
refer to the applicable drawings covering the specific
motor control center (MCC) and any other related inter-
connection drawings. Follow any instructions which may
be given for each device. A list of instruction leaflets
covering standard components is shown on the back
page of this manual. Any of these leaflets may be ob-
tained by contacting your nearest Westinghouse Repre-
sentative.
General guidelines. The whole purpose of maintaining
electrical equipment can be summarized in two rules:
a. Keep those portions conducting that are intended to
be conducting.
b. Keep those portions insulated that are intended to
be insulated.
Good conduction requires clean, tight joints, free of con-
taminants such as dirt and oxides.
I.B. 8926-1
PART 10

MAINTENANCE

Good insulation requires the absence of carbon track-
ing and the absence of contaminants such as salt and
dust that become hydroscopic and provide an unintended
circuit between points of opposite polarity.
Fig. 33 Defeater Mechanism
CAUTION: Maintenance of control components re-
quires that all power to these components be turned
OFF by opening the branch circuit disconnect means
and withdrawing the unit to the detent position (see Fig-
ure 29) or removing the unit entirely from the MCC. When
units are fully inserted into the MCC, the line side of
each disconnect is energized. Do not work on fixed
units unless the main disconnect for the MCC is OFF.
When working on portions of a branch circuit remote from
the MCC, lock the disconnect means for that circuit in
the OFF position. To positively lock the operating mecha-
nism in the OFF position, a metal locking bar
Fig. 34 Locking Out a Disconnect
- Page 24 -