Appendix B - Ts 870 System Voltage Change Procedure - Marathon TS 870 Installation, Operating & Service Manual

The system voltage change procedure is a 2 step process 1) ATS Potential Transformer Tap
Change and 2) TSC 900 Software Programming. Details of each step are as follows:
1) ATS Potential Transformer Tap Change
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
Ensure all power sources are de-energized and are safely Locked-out from service prior
1.
to opening the transfer switch enclosure door.
Disconnect AC Sensing and ATS Power Chassis Circuit Isolation Plugs PL12 & PL15.
2.
Change voltage transformer primary taps settings as follows to match new system
3.
voltage on all potential transformers (PTs). (Refer to wiring schematic diagram below).
Carefully remove the potential transformer high voltage side covers by prying up on
4.
the edge of the cover with a ¼" Flat Head Blade screwdriver and lifting off.
Street, Langley, B.C. Canada V1M 3B1  Telephone (604) 888-0110  Telefax (604) 888-3370
th
9087A - 198
APPENDIX "B"
TS 870 SYSTEM VOLTAGE CHANGE
PROCEDURE
DANGER
THOMSON POWER SYSTEMS
©