Adjustments; Maintenance - Generac Power Systems ATC-300+ Operation And Maintenance Manual

Instruction Booklet
Page 24 Effective: September 2011
Section 7: Adjustments
7.1 General
Refer to I.B. 01602009E, supplied with the ATS for ATC-300+
Controller adjustments and programming.
Table 5. Periodic Maintenance Procedures
STEP
a. Make the ATS equipment safe for inspection and/or maintenance.
b. Inspect the structure area for safety hazards or potential maintenance problems. Inspect the area, especially where switching device is installed, for any safety hazards, including personnel
c. Inspect the power contactor 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. Contact Inspection Procedure
g. Exercise the power contactor if it is not often exercised while in operation. 
This will permit a "wiping" action by the contacts.
h. Return the ATS equipment to service.
Disconnect the line power from equipment being serviced by opening the next highest disconnect device. Make
certain that any accessory control power is switched off by disconnecting all control plugs.
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 melting of conductor surfaces due to arcing.
Inspect the secondary control connections for damage and the control wiring for insulation 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 power
contactor. If contamination 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.
Carefully remove the arc chute clips using needle nose pliers. Remove the arc chutes to inspect the contacts.
Contact Generac if the contacts have excessive wear. Reinstall the arc chutes and arc chute clips, making sure
the ends of the clips are fully seated in the grooves on the barriers.
If the power contactor 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.
For more information visit: www.generac.com
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Section 8: Maintenance
8.1 Introduction
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
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
surroundings. 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 5.
ACTION
WARNING
IB01602078E