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The History Log has the following fields:
• Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN but-
tons to set the time.
• Status — the status of the STS2 at the point of the current frame in the replay. The History log
has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by.
• Critical Event — The event which triggered this log to be written. The event is indicated in red
on the bar graph.
• Frame Number — the current frame in the replay. A negative number indicates the replay is at
a point before the triggering event occurred.
11.3
Alarm Notes
The I-PK on Source 1 and I-PK on Source 2 alarms inhibit automatic transfer due to an overload or
load fault. These alarms can be set for either auto or manual alarm reset.
In the auto reset mode, the alarm is reset as soon as the load current and source voltage return to
normal, and transfers are no longer inhibited. In manual mode, the alarm remains active and trans-
fers are inhibited until the conditions return to normal and the user manually presses the RESET
button (ALRMRST button on LED units). In either case, the cause of the Source 1 or Source 2 I-
Peak overload should be investigated and resolved (such as by reducing the overload condition or
clearing the output fault) before returning the switch to normal operation.
These events indicate a device failure. The device must be replaced and the system must be
restarted for the fault to clear. A shorted SCR automatically trips open a source input switch (CB1
or CB2) to prevent transfers in the event of an SCR failure. The SCR failure must be investigated
and repaired before returning the switch to normal operation. Both source input switches must be
opened (such as when the unit is placed in maintenance bypass for servicing) before a shorted or
open SCR alarm can be reset.
11.4
List of Messages
Table 9 lists available event messages, a definition of the event, and the functions that are acti-
vated with the event by default. The functions are indicated as follows:
D — The indicated event initiates the Auto-Dial sequence through the optional modem.
A — The indicated event activates the Audible alarm.
F — The indicated event triggers a Freeze of the History Log.
L — The indicated event Latches. A latched alarm remains displayed until the alarm condition
has cleared and the RESET (ALRMRST) button has been pressed.
E — By default, all faults and alarms are written to the Event Log. Changing this setting is
only available for the LED units and is set through the RS-232 port. See Setting Event
Masks with the Terminal on page 77
All of these functions, except Freeze, can be reconfigured to trigger for each event, using the Event
Mask option. See 11.1 - Event Mask on page 65. The Freeze function is hard-coded and cannot be
changed for a event.
If the front panel of your STS2 contains LEDs and push buttons instead of the touch screen inter-
face, you can view these messages via the RS-232 port. See 12.1.1 - Connecting and Using a
Terminal on page 71 for the commands to view the event messages on a PC terminal.
An LED is used to indicate the presence of any active fault or alarm. Refer to 14.0 - Operating the
LED Display STS2 on page 99 for more information about the LEDs.
Alarm and Faults
67
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