4916 - 275th Street, Langley, BC, Canada V4W 0A3 · Telephone (604) 888-0110
Email: info@thomsonps.com · www.thomsonps.com
The system voltage change procedure is a 2 step process
• ATS Potential Transformer Tap Change
• TSC 900 Software Programming
Details of each step are as follows:
A) ATS Potential Transformer Tap Change
DANGER
HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH
This equipment must be serviced only by qualified electrical personnel utilizing safe work
practices and appropriate Personal Protective Equipment (PPE).
Many components of this equipment operate at line voltage. DO NOT TOUCH. Use only
electrically isolated tools.
Install and close all covers before applying power to this equipment
Do not open covers to equipment until ALL power sources are disconnected
1. Ensure all power sources are de-energized and are safely Locked-out from service prior
to opening the transfer switch enclosure door.
2. Disconnect AC Sensing and ATS Power Chassis Circuit Isolation Plugs PL12 & PL15.
3. Change voltage transformer primary taps settings as follows to match new system
voltage on all potential transformers (PTs). (Refer to wiring schematic diagram below).
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