Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 60
9.2.3 SCR’s
The unit uses brick-type SCRs rated to carry the full load. Because the unit is a fuseless design with
non-automatic circuit breakers, overcurrent protection is provided by upstream circuit breakers.
9.2.4 Logic Modules
The logic contains three separate redundant logic modules. Each module contains the logic necessary to run the
Liebert STS2 and control transfers and shunt trips under all circumstances, without any outside assistance, once
set up and started properly.
9.2.5 Audible Alarm
An audible alarm is installed on the control board. This alarm is triggered by an alarm condition detected on the
unit. The alarm can be turned Off from the touchscreen (Color Graphical Display units) or by a push button (LED
Display units). Turning Off the audible alarm does not clear or reset the condition that triggered the alarm.
9.2.6 RS-232 Port
An RS-232 serial port is provided to allow an external terminal to be connected as another user interface. See
12.1 - Using the RS-232 Port on page 73 for more information on using the RS-232 port.
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