Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 59
9.2 Detailed Component Description
9.2.1 Controls
Operator Interface
The Liebert STS2 Color Graphical Display unit contains a touchscreen color LCD to provide the operator
interface to control and configure the operation of the unit and quickly diagnose problems. A password and an
optional keylock, if installed, are provided for security.
The LED Display unit includes push buttons for source transfer, alarm reset and audible alarm silence.
Hardware
• The Liebert STS2 operator interface in the Color Graphical Display unit is designed to provide all of the information required
to configure and monitor the unit’s operation.
• The control logic performs automatic operations with minimal operator interface.
• Each Liebert STS2 unit is equipped with either a color LCD touchscreen or a panel of LED’s and push buttons.
• The Liebert STS2 can have optional communication ports installed. See 6.0 - Options and 12.0 - Communication
Interfaces on page 73 for more information on communication options.
• On LED Display units, the RS-232 interface is used for configuration and status and event log monitoring. The RS-232
interface can also be used with the Color Graphical Display units, if necessary.
Firmware
The operator interface enables you to monitor the Liebert STS2, to configure set points for transfers, monitor
system parameters and access event and history logs. The firmware is accessible through the LCD touchscreen
(if installed) or the RS-232 interface. The firmware includes:
• View and set the preferred source.
• View and configure setpoints.
• View alarms, faults and status.
Additionally, the Color Graphical Display unit provides:
• The mimic graphical representation of the systems operation.
• Menu driven monitoring and configuration.
• Step-by-step instructions to assist you in the startup, shutdown and bypass operations.
• Help on event messages.
• Touchscreen alarm reset and silence buttons.
Events in the system, both faults and alarms, are detected and displayed on the LCD. See 11.0 - Alarm and
Faults on page 68 for more information on events.
• A set of event masks can be configured through the LCD to trigger a system response to an event. See 11.1 - Event Mask.
• Report event conditions from other components of the system.
• Monitor and report changes in event condition states. If the event condition’s state changes from inactive to active, a new
event is detected. If the transition is from active to inactive, the event condition has cleared.
• Process new faults and alarms, and clear inactive alarms.
• Provide the alarm reset and silence options.
9.2.2 Circuit Breakers
Three circuit breakers provide total isolation of the solid-state switching devices with an input breaker for each
source and a load isolation breaker. Two breakers provide for maintenance bypassing of the solid-state switching
devices to either input source.
All switches in the Liebert STS2 are plug-in types, which allows any switch to be replaced without de-energizing
the output bus. The breakers have an interlock in the plug-in base, which prevents the switch from being
withdrawn in the CLOSED position. The switch trips OPEN before it disconnects from the plug-in base.
See 15.2.5 - Circuit Breakers for specifications and more information pertaining to the circuit breakers. See
Figure 13 to Figure 18 for circuit breaker locations. See submittal PS214002 for the circuit breaker schedule .
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