TP-6745 7/1014 Section 1 Scheduled Maintenance
1.5 Service Schedule
Follow the service schedule below for the
recommended service intervals. The transfer switch
operator can perform tasks marked by an X. Have an
authorized distributor/dealer inspect the switch annually
and perform all service marked by a D.
System Component or Procedure
See
Section
Visually
Inspect
Check
Adjust,
Repair, or
Replace
Clean Test
Interval
Electrical System
Check for signs of overheating or loose connections:
discoloration of metal, melted plastic, or a burning odor.
1.3 X X Y
Manually operate the power switching device and
lubricate, if necessary. *
1.3.3 D D Y
Check wiring insulation for deterioration, cuts, or
abrasion. Repair or replace wiring to regain the
properties of the original wiring.
1.3
X Y
D D D Y
Check the transfer switch’s main power switching
mechanisms’ mechanical operation and integrity.
1.3 D D D Y
Tighten control and power wiring connections to
specifications.
1.3 D D Y
Test wire and cable insulation for electrical breakdown. 1.4.3 D Every 3 Years
Check calibration of voltage-sensing circuitry and
setpoints, and recalibrate circuitry as necessary.
1.4.3 D D Every 5 Years
Control System
Exercise the generator set without load. 1.4.1, O/I/M X W
Test the transfer switch’s automatic control system. O/I/M X X M
Test all LED indicators, time delays, and remote control
systems for operation.
O/I/M D D D D Y
General Equipment Condition
Inspect the outside of the transfer switch for any signs
of excessive vibration, leakage, high temperature,
contamination, or deterioration.*
1.2 X X M
Check that all external hardware is in place, tightened,
and not badly worn.
1.2 X X X M
Inspect the inside of the transfer switch for any signs of
vibration, leakage, noise, high temperature,
contamination, moisture, or deterioration. Check for
metal discoloration, melted plastic, or a burning odor.*
1.3
X M
D D D Y
Check that all internal hardware is in place, tightened,
and not badly worn.
1.3
X M
D D Y
* Service more frequently if the ATS operates in extremely dusty or dirty areas.
See Section: Read these sections carefully for additional information before attempting maintenance or service.
Visually Inspect: Examine these items visually.
Check: Requires physical contact with or movement of system components, or the use of nonvisual indications.
Adjust, Repair, or Replace: Includes tightening hardware and lubricating the mechanism. May require replacement of components depending
upon the severity of the problem.
Clean: Remove accumulations of dirt and contaminants from external transfer switch’s components or enclosure with a vacuum cleaner or by
wiping with a dry 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.
Test: May require tools, equipment, or training available only through an authorized distributor/dealer.
Symbols used in the chart:
O/I/M=See the transfer switch operation/installation manual.
X=The transfer switch operator can perform these tasks.
D=An authorized distributor/dealer must perform these tasks.
W=Weekly
M=Monthly
Q=Quarterly
S=Semiannually (every six months)
Y=Yearly (annually)
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