Transfer Switch Inspection

Wheeler Power Systems employs more than 12 field technicians to serve our customers 24/7 and quick response and quality service is our number one goal. With employee safety being the most important aspect of our business and yours, Wheeler Machinery has taken the initiative to make sure our technicians are properly trained to work on many makes and models of automatic transfer switches (ATS) to include CAT, Zenith, ASCO, Onan and others. Technicians have completed Arc Flash training and are required to wear the appropriate PPE for each inspection and repair. This ensures that when Wheeler Machinery arrives on site we are providing electrical safety practices that are standard in our industry.

Wheeler Power Systems will perform the following inspection points below and take corrective action if any, as needed. Where applicable and when permitted by the customer, we will inspect the following items:

DE-ENERGIZED	DISABLED
1. Check all terminal connections for tightness.	1. Inspect all insulation for degradation.
2. Re-torque connections, TS mounting, contact mounting and terminal strips.	2. Inspect barriers for arc chutes.
	3. Inspect Transfer Switch coil, rectifier and resistors
	4. Inspect the coil and/or circuit cards and protective devices.
	5. All other accessory relays
	6. Inspect all timers
	7. Inspect and infrared arcing contacts where possible.
	8. Inspect and infrared main contacts where possible.
	9. Inspect linkage and lubricate as necessary.
	10. Clean the exposed Transfer Switch coil core and lubricate.
	11. Clean and vacuum Transfer Switch enclosure and controls.
	12. Inspect transfer switch & enclosure for corrosion, moisture and/or chemicals.
	13. Inspect and lubricate cabinet hardware for proper operation.
	14. Re-lubricate the transfer switch operator and pivot points.
	15. Replace defective switch indicator bulbs.

24 Hour Emergency Service 801-978-1581

ENERGIZED	BYPASS / ISOLATION SWITCHES
1. Record utility voltage	9. Inspect arcing contacts.
2. Record utility amperage	10. Inspect main contacts.
3. Record peak amperage	11. Inspect barrier and arc chutes.
4. Check for proper operation of the transfer switch, timers, relays, remote start contacts, exercisers, phase monitors and record settings.	12. Inspect linkage and lubricate as necessary.
5. Check for excessive heat build-up with infrared thermometer.	13. Check engine start bypass contacts for proper operation.
6. Record emergency voltage.	14. Inspect all safety interlocks.
7. Record emergency frequency.	CLOSE TRANSITION TRANSFER SWITCHES
8. Inspect all optional accessories.	15. Check closed transition Bypass operation.
	16. Check alarm time delay settings.
	MISCELLANEOUS ITEMS
	17. Replace ATS Batteries as needed.
	18. Customer authorized Load Transfer.
	19. Place all switches in proper operation mode.
	20. Provide customer with written documentation of service procedures, any findings, suggested repairs and recommend corrective actions as needed.

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24 Hour Emergency Service 801-978-1581