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Instruction Booklet
IB0162063EN
Effective January 2014
O & M Manual for the EGS Metered, Service
Entrance Automatic Transfer Switch with Relay Control
Eaton Corporation www.eatoncanada.ca
Section 7: Maintenance and Component
Replacement
7.1 Introduction
Warning
HigH VOLTagES arE PrESEnT in anD arOUnD TranSFEr SWiTCH
EQUiPMEnT. BEFOrE inSPECTing Or MainTaining THiS EQUiPMEnT,
DiSCOnnECT THE LinE POWEr FrOM THE EQUiPMEnT BEing SErViCED
BY OPEning anD LOCKing OUT, iF POSSiBLE, THE nEXT HigHEST
DiSCOnnECT DEViCE. FaiLUrE TO FOLLOW THiS PrOCEDUrE COULD
CaUSE SEVErE PErSOnaL inJUrY anD/Or DEaTH.
In general, ATS 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 maintenance
checks should be made on a regularly scheduled basis. Since equip-
ment maintenance will consist mainly of keeping the equipment
clean, the frequency of maintenance will depend, to a large extent,
on the cleanliness of its surroundings. If a significant amount of
dust or foreign matter is present, a more frequent maintenance
schedule should be followed.
It is suggested that visual inspections of the equipment be made on
a regular basis, not just during regularly 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.
Figure 16 is the wiring diagram for the EGS ATS switch.
ote:
N
Only qualified and experienced personnel should attempt any diagnostic work
using this diagram.
7.2 Procedures
A suggested maintenance procedure to be followed is outlined in
Table 4.
Table 4. Recommended Periodic Maintenance Procedures
Step
action
a. Make the transfer switch equipment safe for inspection and/or maintenance.
Disconnect the line power from the equipment being serviced by opening next highest disconnect
device. Make certain that any accessory control power is switched off.
b. Inspect the structure area for safety hazards or potential maintenance problems.
Inspect the area, especially where the contactor is installed, for any safety hazards, including per-
sonal safety and fire hazards. Exposure to certain chemical vapors can cause deterioration of the
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 the conductor insulation, or as pitting or melting of the conduc-
tor surfaces due to arcing.
Inspect the secondary control connections for damage, and control wiring for insulation
integrity.
c. Inspect the contactor for dust, dirt, soot, grease, moisture, or corrosion.
Remove dust, dirt, soot, grease, moisture, and corrosion contamination from the surface of the switch-
ing device using a dry, soft lint-free cloth, dry soft bristle brush, and vacuum cleaner. Do not blow
debris into the contactor. If contamination is found, look for the source and fix the problem.
d. Check for material integrity, uneven wear, discoloration, or loose hardware.
Severe material cracking will require replacement and loose hardware will need to be tightened.
e. Check the terminals and connectors for looseness or signs of overheating.
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.
f. Exercise the contactor if it is not often exercised while in operation. This will permit
the wiping action by the contacts.
If a switching device is used for frequent switching during normal operation, this step can be disre-
garded.
g. Return the transfer switch equipment to service.
Make certain all barriers are in place and the door is closed. Re-apply generator and utility power.
