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NOTE
If one source will be de-energized for an extended period (hours or days), set
the unit to bypass mode for the remaining source. Without using bypass, if a
failure occurs in the switch components for remaining source, the STS2 does
not have a second source to switch to and the load would not receive power.
See Maintenance Bypass on page 61 for bypass instructions.
If your system contains the LED front panel instead of the LCD touch screen, refer to 14.2.2 -
Manual Transfer / Preferred Source Selection on page 104 for instructions on this procedure.
Figure 34 Source Transfer Screen
To manually select the preferred source:
1. Verify that the input breakers CB1 and CB2 are closed.
2. Select SOURCE XFERS from the menu bar.
The Select Preferred Source screen is displayed in the Event Display.
3. Check the Mimic to verify that Source 1 and Source 2 input voltages are correct.
4. Select SOURCE 1 or SOURCE 2 as your preferred source.
When conditions are correct, the switch transfers the load to the alternate source by selecting
the alternate source as the preferred source.
This source is now monitored as the preferred source throughout the various configurations set
up through the touch screen.
5. Verify that the correct source is designated as the preferred source and that the input source
changes to the desired source.
The Mimic is updated to indicate the new preferred source. The source is now highlighted with blue
and that source is labeled as the preferred source.
60
Operating Instructions for the Touch Screen Interface
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