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TP-6461 1/08 19 Section 1 Scheduled Maintenance
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.
1.2.2 X X Y
Check the transfer switch’s external operating
mechanism for cleanliness. Clean and relubricate if
dirty.*
1.2.2 X D D Y
Check wiring insulation for deterioration, cuts, or
abrasion Repair or replace wiring to regain the
1 2 2
X Y
abrasion. Repair or replace wiring to regain the
properties of the original wiring.
1.2.2
D D D Y
Check the transfer switch’s main power switching
mechanisms’ mechanical operation and integrity.
1.2.2 D D D Y
Tighten control and power wiring connections to
specifications.
1.2.2 D D Y
Check the transfer switch’s main power switching
contacts’ condition. Clean or replace the main contacts
or replace the transfer switch assembly as necessary.
1.2.2 D D D Y
Perform a millivolt drop test to check for high contact
resistances on power circuits. Tighten connections,
clean main contacts, or adjust or replace main contacts
or transfer switch assembly to eliminate high contact
resistances.
1.3.3 D D D D Y
Test wire and cable insulation for electrical breakdown. 1.3.3 D Every 3 Years
Check calibration of voltage-sensing circuitry and
setpoints, and recalibrate circuitry as necessary.
1.3.3 D D Every 5 Years
Control System
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.*
1.2.1 X X M
Check that all external hardware is in place, tightened,
and not badly worn.
1.2.1 X X X M
Inspect the inside of the transfer switch for any signs of
vibration, leakage, noise, high temperature,
1 2 2
X M
vibration, leakage, noise, high temperature,
contamination, or deterioration. Check for metal
discoloration, melted plastic, or a burning odor.*
1.2.2
D D D Y
Check that all internal hardware is in place, tightened,
1 2 2
X M
Check that all internal hardware is in place, tightened,
and not badly worn.
1.2.2
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)
Figure 1-4 Service Schedule