Maintenance - Eaton ATC-300 Operation And Maintenance Manual

Instructional Booklet
Page 32 Effective: May 2015
Section 8:

Maintenance

8.1 Introduction
WARNING
HIGH VOLTAGES ARE PRESENT IN AND AROUND ATS EQUIPMENT.
BEFORE INSPECTING OR MAINTAINING THIS EQUIPMENT, DISCON-
NECT THE LINE POWER FROM, THEN LOCK OUT, IF POSSIBLE, THE
NEXT HIGHEST DISCONNECT DEVICE. FAILURE TO FOLLOW THIS
PROCEDURE COULD CAUSE SEVERE PERSONAL INJURY AND/OR
DEATH.
In general, ATS switch equipment is designed to be relatively
maintenance free under normal usage. However, because of the
variability of application conditions and the importance placed on
dependable operation by this type of equipment, inspection and
Table 6. Periodic Maintenance Procedures
a. Make the ATS equipment safe for inspection and/or maintenance.
b.Inspect the structure area for safety hazards or potential maintenance problems.
c.Inspect the molded case switching devices for dust, dirt, soot, grease, moisture, or corrosion.
d.Check for material integrity, uneven wear, discoloration, or loose hardware.
e.Check the terminals and connectors for looseness or signs of overheating.
f.Exercise the molded case switching devices if they are not often exercised while in operation.
This will permit a "wiping" action by the contacts.
g.Return the ATS equipment to service.
STEP
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ATC-300 /900 Breaker Based Transfer Switch
maintenance checks should be made on a regularly scheduled
basis. Since equipment maintenance will consist mainly of keep-
ing the equipment clean, the frequency of maintenance will
depend to a large extent on the cleanliness of the equipment's sur-
roundings. If a significant amount of dust or foreign matter is
present, a more frequent maintenance schedule should be fol-
lowed.
It is suggested that visual inspections of the equipment be made
on a regular basis, not just during scheduled periods. Always be
alert for an accumulation of dirt in and around the structure; loose
parts; and/or hardware, cracks, and/or discoloration to insulation;
and damaged or discolored components.
8.2 Procedures
A suggested maintenance procedure is outlined in Table 6.
Disconnect the line power from equipment being serviced by opening the next highest dis-
connect device. Make certain that any accessory control power is switched off by dis-
connecting all control plugs.
Inspect the area, especially where molded case switching devices are installed, for any
safety hazards, including personnel safety and fire hazards. Exposure to certain chemical
vapors can cause deterioration of electrical connections.
Inspect for accumulated dirt, loose hardware, or physical damage.
Examine the primary insulation for evidence of cracking or overheating. Overheating will
show as discoloration, melting, or blistering of conductor insulation, or as pitting or melt-
ing of conductor surfaces due to arcing.
Inspect the secondary control connections for damage and the control wiring for insula-
tion integrity.
Remove dust, dirt, soot, grease, moisture, and corrosion contamination from the surface
of the switching device using a dry soft lint-free cloth, dry soft bristle brush, and vacuum
cleaner. Do not blow debris into the circuit breaker or nearby breaker structure. If con-
tamination is found, look for the source and fix the problem.
Severe material cracking will require replacement and loose hardware will need to be
tightened.
Overheating will show as discoloration, melting, or blistering of the conductor insulation.
Connections that do not have signs of looseness or overheating should not be disturbed.
If a switching device is used for frequent switching during normal operation, this step can
be disregarded.
Make certain all barriers are in place and doors closed. Reapply secondary and primary
power.
ACTION
IB140042EN