Liebert POWER PROTECTION STATIC TRANSFER SWITCH - Manual (Page 67)

Introduction to STS2 Operations
59
8.2.4 Bypass
The static transfer switch can be manually bypassed to allow the power from a source to directly flow
to the output load. This bypass allows the unit’s electronics to be serviced without dangerous voltages
being present.
The STS2 includes key-interlocked maintenance bypass breakers that allow either input source’s elec-
tronics to be bypassed for maintenance without interruption of power to the load. The maintenance
bypass allows all electronics to be isolated from the input, output, and bypass connections. Bypass
instructions are available from the touch screen and are discussed later in this manual.
8.3 Operator Controls
The STS2 is equipped with an interface to configure and monitor the unit either locally or remotely.
The Color Graphical Display is a touch screen LCD that provides a color diagram (Mimic) that dis-
plays the current status of the unit. System parameters are displayed and help is available to define
events. See Figure 45 below and Figure 31. The touch screen menus allow the operator to initiate
source transfers, view event and history logs, and view bypass and other operational instructions.
Figure 45 STS2 touch screen display
Touch screen control buttons allow you to reset alarms, silence the audible alarm, review configura-
tions, event and history logs, preferred source, startup and bypass procedures, and the help menu.
Qualified personnel, with a password, can use these menus to configure parameters, select a pre-
ferred source, and do manual source transfers.
LED display units do not have the color LCD display. Instead of the touch screen, these units are
monitored by a series of LEDs and controlled by a series of push buttons.
Both units can be accessed from a terminal, or a PC running terminal emulation software, that is
attached to the unit. Through the RS-232 access, you can monitor and configure the unit, plus
remotely select a preferred source. See 12.1 - Using the RS-232 Port on page 76 for instructions on
using the RS-232 interface.
Mimic
Event Display
Event controls
Display Panel
and
Help Screen
Menu Options