Eaton Electrical Magnum Transfer Switch manual Introduction, Maintenance Procedures

Instructional Booklet

Fixed and Drawout Magnum Transfer Switches

Effective: March 2007 Page 31

Section 9: Maintenance

9.1 Introduction

WARNING

HIGH VOLTAGES ARE PRESENT IN AND AROUND TRANSFER SWITCH EQUIPMENT. BEFORE INSPECTING OR MAINTAINING THIS EQUIPMENT, DISCONNECT THE LINE POWER FROM THE EQUIP- MENT BEING SERVICED BY OPENING AND LOCKING OUT, IF POSSI- BLE, THE NEXT HIGHEST DISCONNECT DEVICE. FAILURE TO FOLLOW THIS PROCEDURE COULD CAUSE PERSONAL INJURY AND/ OR DEATH.

In general, transfer switch equipment is designed to be relatively maintenance free under normal usage. How-ever, 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 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.

WARNING

THE CLOSED TRANSITION PRODUCT CONTAINS A SPECIAL CON- TACT ARRANGEMENT (OVERLAPPING CONTACTS). MISUSE CAN RESULT IN DEATH, SEVERE PERSONAL INJURY, AND/OR PROPERTY DAMAGE.

Table 6. Periodic Maintenance Procedures.

STEP

9.2 Maintenance Procedures

A suggested maintenance procedure to follow is outlined in Table 6.

ACTION

a.Make the transfer switch equipment safe for inspection and/or mainte- Disconnect the line power from the equipment being serviced by opening next highest disconnect device. Make

	nance.	certain that any accessory control power is switched off and the logic plugs are disconnected
b.	Inspect the structure area for any safety hazards or potential mainte	Inspect the area, especially where switching devices are installed, for any safety hazards, including personnel
	nance problems.	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
c.	Inspect the switching devices for dust, dirt, soot, grease, moisture, or	Remove the dust, dirt, soot, grease, moisture, and corrosion contamination from the surface of the switching
	corrosion.	device using a dry, soft lint-free cloth, dry, soft bristle brush, and vacuum cleaner. Do not blow debris into the
		switching device or nearby breaker structure. If contamination is found, look for the source and fix the problem.

d.Check for material integrity, uneven wear, discoloration, or loose hard- Severe material cracking will require replacement and loose hardware will need to be tightened. ware.

e.Check all terminals and connectors for looseness or signs of overheat- ing.

Overheating will show as discoloration, melting, or blistering of conductor insulation.

Connections that do not have signs of looseness or overheating should not be disturbed.

f.	Exercise the switching devices if they are not often exercised while in	If a switching device is used for frequent switching during normal operation, this step can be disregarded.
	operation. This will permit a wiping action by the contacts.
g.	Inspect NEMA 3R filters for blockage or contamination.	For NEMA 3R enclosed transfer switches with venting, check that the air filters are clean and uncompromised.
		Replace the filters as necessary.
h.	Return the transfer switch equipment to service.	Make certain that all barriers are in place and the doors are closed. Reapply the Source 1 and Source 2 power.

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