56 Theory of Operation
Hardware
• The 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 STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and push
buttons.
• The STS2 can have optional communication ports installed. See
6.0 - Options
on page 18 and
12.0 - Communication Interfaces
on page 70 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 STS2, to configure set points for transfers, mon-
itor system parameters and access event and history logs. The firmware is accessible through the
LCD touch screen (if installed) or the RS-232 interface. The firmware includes:
• View and set the preferred source.
• View and configure set points.
• 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 start-up, shut-down and bypass operations.
• Help on event messages.
• Touch screen 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 65 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 bypass-
ing of the solid-state switching devices to either input source.
All switches in the STS2 are plug-in types, which allows any switch to be replaced without de-ener-
gizing the output bus. The Merlin Gerin breakers have an interlock in the plug-in base, which pre-
vents 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
on page 110 for specifications and more information pertaining to
the circuit breakers. See
Figure 14
on page 32 to
Figure 19
on page 37 for circuit breaker loca-
tions. The circuit breaker schedule is provided in
Figure 20
on page 38.
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