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11.0 A
LARM AND
Alarms and faults are events that are triggered when the operation of the static transfer switch
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 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 STS2 monitoring system detects and annunciates a comprehensive set of fault and alarm con-
ditions. Faults and alarm messages are can be viewed on the LCD touch screen or via the RS-232
port.
On the LCD touch screen, the events are shown in the Status Display panel in the lower left corner
of the touch screen 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 - STS2 Touch Screen Display on page 79 for more
information on the touch screen.
If you are monitoring the system through the RS-232 port, see Table 10 - Terminal
Commands on page 71 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 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.
When the system is furnished with an optional internal or 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 touch screen. See Configuring the Modem on page 88 for instructions
on for setting up your modem.
11.1
Event Mask
The 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 origi-
nating event condition clears. A latched event may only be cleared by pushing the RESET but-
ton (ALRMRST on the LED units).
• Dial Out — If the selected event is triggered, the system automatically calls the specified tele-
phone numbers through the modem. For example, a page could be sent or an event could be
sent to a external terminal, via the modem. See Communication Interfaces on page 70 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 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.
F
AULTS
Alarm and Faults
65
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