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.
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 |
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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. |
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| Inspect for accumulated dirt, loose hardware, or physical damage. |
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| Examine the primary insulation for evidence of cracking or overheating. Overheating will show as discoloration, |
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| melting or blistering of conductor insulation, or as pitting or melting of conductor surfaces due to arcing. |
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| Inspect the secondary control connections for damage and the control wiring for insulation integrity |
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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 |
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| 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. |
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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. |
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| 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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IB01602011E | For more information visit: www.Eaton.com |