Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 68
11.0 ALARM AND FAULTS
Alarms and faults are events that are triggered when the operation of the Liebert STS2 falls outside the defined
parameters. These events can also be triggered by: user actions, such as changing configurations, clearing logs,
etc.; failed components such as a fan failure, an SCR that is open or closed, etc.; and system status, such as open
circuit breakers, load on alternate source, etc. These events can provide a warning or trigger the system to make
a change, such as switch sources or the recording of a history log.
The Liebert STS2 monitoring system detects and annunciates a comprehensive set of fault and alarm
conditions. Faults and alarm messages are can be viewed on the LCD touchscreen or via the RS-232 port.
On the LCD touchscreen, the events are shown in the Status Display panel in the lower left corner of the
touchscreen and written to the Event log. You can touch a message to view a definition of an event and a tip for
troubleshooting. See 13.0 - Liebert STS2 Touchscreen Display for more information on the touchscreen.
If you are monitoring the system through the RS-232 port, see Table 6 - Terminal commands on page 74 for the
commands to view event logs, and alarm and fault lists.
Event actions can be triggered by the settings configured from the Event Masks. See 11.1 - Event Mask for more
information.
Faults — A fault indicates that a component of the Liebert STS2 has failed or has been damaged. In the Event
Display, faults are indicated in red.
Alarms — An alarm is an event caused by a significant abnormal system condition. In the Event Display, alarms
are indicated in yellow. The setpoints for many of the alarms are configurable through the User Settings. Many
alarms clear themselves when the condition is resolved. If an alarm event mask is set to latch, the alarm
messages remain active until the alarm condition has been corrected and the RESET button is pushed. See 11.1 -
Event Mask for more information on latching.
11.1 Event Mask
The Liebert STS2 gathers, processes and reports faults and alarms, collectively referred to below as events. The
Event Mask dialog box allows you to set the system’s response for specific alarms and faults that are generated.
The following mask types are available for each event:
• Latch — If a latch is enabled for the selected event, that event remains active even if the originating event condition clears.
A latched event may only be cleared by pushing the RESET button (ALRMRST on the LED units).
• Event Log — The selected event is date/time stamped and recorded to the Event Log when the event is triggered.
• Audible — If the selected event is triggered, an audible beeper or horn is sounded by the Liebert STS2. The beeper
continues while this event is active or latched, or until the SILENCE button (NOAUD on the LED units) is pushed. This
button must be pushed with the ALRMRST button on the LED units.
See Event Masks on page 85 for instructions on setting the mask type via the touchscreen display. See the
12.1.4 - Setting Event Masks with the Terminal on page 80 for instructions on configuration using the RS-232
port.
11.2 Event and History Logs
The system tracks events through the Events Log and tracks significant events through the History Logs. These
logs allow you to quickly spot trends or diagnose problems that the unit may have had. Both logs are written in
nonvolatile memory.
The logs can be accessed from the touchscreen menu or the RS-232 port. See 13.11 - Logs for more instructions
on viewing the logs from the touchscreen. See Table 6 - Terminal commands on page 74 for the RS-232
interface commands used to access the logs.
To Next Page
Loading...
