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 Preventive Maintenance Checks and Services
Table 2-1.
S - Semiannually A - Annually
Q - Quarterly
D - Daily W - Weekly M - Monthly
Items To Be
Interval
Item
Procedures
Inspected/
No.
D
W
M
Q
S
A
Serviced
CONTROL CENTERS/SWITCHBOARDS - CONT
NOTE
Motor Control
89
q
Centers -
The brown discoloration found on
CONT
silver and silver-plated contacts
is harmless. Silver or silver-
plated contacts that have sharp
projections should be renewed.
(6) Inspect shunts/flexible conductors for burned,
corroded, broken, and frayed conductors.
(7) Inspect wiring for burnt, chafed, frayed, or
chipped insulation.
(8) Inspect electrical and mechanical connections for
tightness.
(9) Tighten loose connections; use jamnuts or
lockwashers to keep connections tight.
(10) Operate each contactor manually several times;
moving parts should operate freely without binding
or sticking.
Close/reinstall controller access cover(s).
(11)
(12) Remove safety tag(s) and energize circuit(s).
(13) Test operate controller when associated equipment
can be operated.
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