TP-5660 11/98 Scheduled Maintenance 19
4.1.1 General Inspection
External Inspection Keep the transfer switch clean
and in good condition by performing a weekly general
external inspection of the transfer switch for any
condition of vibration, leakage, noise, temperature,
contamination, or deterioration. Remove
accumulations of dirt, dust, and other contaminants
from the transfer switch’s external components or
enclosure witha vacuum cleaner orby wiping with adry
cloth or brush. Do not use compressed air to clean the
switch because it can cause debris to lodge in the
components and cause damage. Replace any worn,
missing, or broken external components with
manufacturer-recommended replacement parts.
Contact a local authorized service center for specific
part information and part ordering. Tighten loose
external hardware.
Internal Inspection Disconnect all power sources,
open the transfer switch enclosure door, and inspect
internal components monthly or when any condition
noticedduringan externalinspectionmayhave affected
internal components.
Contact an authorized service center to inspect and
service the transfer switch if any of the following
conditions are found inside the transfer switch.
D Accumulations of dirt, dust, moisture, or other
contaminants
D Signs of corrosion
D Worn, missing, or broken components
D Loose hardware
D Wire or cable insulation deterioration, cuts, or
abrasion
D Signs of overheating or loose connections:
discoloration of metal, melted plastic, or a burning
odor
D Other evidence of wear, damage, deterioration, or
malfunction of the transfer switch or its
components.
If the power interruption required to perform an internal
inspection is unacceptable in the application, have an
internal inspection performed by an authorized service
center.
4.1.2 Other Inspections and Service
Have an authorized service center perform scheduled
maintenance, service, and other maintenance that
ensures the safe and reliable operation of the transfer
switch including annual inspection and testing. See
Section 4.3—Service Schedule for the recommended
maintenance items and service intervals.
Have an authorized service center repair or replace
components inside the transfer switch enclosure with
manufacturer-recommended replacement parts.
4.2 Testing
4.2.1 Weekly Generator Set Exercise
Use a plant exerciser or manual test to startand runthe
generatorset undera loadoncea weekto maximizethe
reliabilityoftheemergencypowersystem. Seethelogic
controller operation and installation manual for the
procedure to exercise the generator set. See List of
Related Materials in the Introduction section in this
manual.
4.2.2 Monthly Automatic Control
System Test
Test the transfer switch’s automatic control system
monthly. See the logic controller operation and
installationmanualforthetestprocedure. Verifythatthe
expected sequence of operations occurs as the switch
transfers the load to the emergency source when a
normal source failure occurs or is simulated. Observe
the indicators (incandescent lamps and LEDs) included
on the transfer switch to check their operation. When
the switch transfers the load to the emergency source
(after a time delay in the off position on programmed
transition units), end the test and verify that the
expectedsequence ofoperations occursasthe transfer
switchretransferstotheavailablenormalsource(aftera
time delay in the off position on programmed transition
units) andsignals thegenerator set to shut down aftera
cooldown period.
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