Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 82
11.0 ALARMS AND FAULTS
Alarms and faults are events that are triggered when the operation of the Liebert STS2/PDU falls outside of 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 shorted, 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/PDU 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 - TOUCHSCREEN Display for more information about the touchscreen.
If you are monitoring the system through the RS-232 port, see Table 14 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/PDU 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.
When the system is equipped with an external modem and a telephone line is connected to the modem, the
system can be programmed to automatically dial out upon occurrence of any of certain designated alarms. The
auto-dial feature can be configured for alarms using the Event Mask option in the touchscreen. See Configuring
the Modem on page 106 for instructions on for setting up a modem.
11.1 Event Mask
The Liebert STS2/PDU 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.
• Dial Out — If the selected event is triggered, the system automatically calls the specified telephone numbers through a
modem. For example, a page could be sent or an event could be sent to a external terminal, via a modem. See 12.0 -
Communication Interfaces for more information on configuring communications options.
• 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/PDU. The beeper continues while this event is active or latched or until the SILENCE button is pushed.
See Event Masks on page 100 for instructions on setting the mask type via the touchscreen. See the 12.1.4 -
Setting Event Masks with the Terminal for instructions on configuration using the RS-232 port.
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