Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 83
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 13.7.1 - Logs for more instructions
on viewing the logs from the touchscreen. See Table 14 for the RS-232 interface commands used to access the
logs.
11.2.1 Event Log
The events are tracked in sequence of occurrence. The sequence of occurrence is identified by date, time and
frame number. The last 512 events are stored in a nonvolatile memory and can be viewed from the Event Log.
Event logs wrap, meaning when the log is full, the oldest event is deleted when a new event is written to the log.
The Event Log tracks:
• # — the sequence number in which the event occurred since the log was last cleared.
• Message — the event that occurred, such as Ambient Over temp., Source 1 Fail, etc.
• Type — either a Fault or Alarm. See 11.0 - Alarms and Faults for further details on these events.
• ID — the event identifier.
• Date and Time — when the event occurred.
• Faults — the number of fault events logged.
• Alarms — the number of alarm events logged.
• User Alarms — the number of alarm events logged that were triggered by user-created alarms, such as those alarms
created with the Input Contact Isolator settings.
• Total — the sum of all the events currently logged.
11.2.2 History Log
When a designated major alarm occurs, the History Status buffer is frozen, capturing 64 sequential frames before and
after the alarm condition. When the History Status buffer is frozen, a History Log is created.
Two History Logs are available to track major alarms. This log includes the triggering event plus the surrounding
events and the system voltages, currents, frequency, power, source selection and breaker positions at the time of
the event. The History Log displays the 64 sequential frames, in 4-millisecond intervals, of the Present Status
screens surrounding the event.
If you are viewing the log from the touchscreen, the Mimic and the Event Display show the data that was present
as the alarm was triggered. The data is displayed as frames are played.
The History Log allows you to replay the events leading up to the alarm and the events right after the alarm to
see the status of the switch at that time and diagnose the cause of the alarm. The History Log is triggered when
certain events are tripped that have the Freeze option enabled.
You can run through the frames sequentially. The sequence of the events is identified by date, time and frame
number. The History Log frames are stored in a nonvolatile memory buffer that is continuously overwritten until
a designated fault condition occurs. When the fault occurs to trigger a freeze, the History Log stores the next 23
frames, then freezes until it is reset. The History Log then keeps 40 frames before the fault, the frame where the
fault occurred, plus the next 23 frames.
The History Log should not be reset until the fault condition that caused the buffer to freeze is reviewed and
investigated by a qualified service technician. After the alarm condition has been corrected, the History Log can
be cleared.
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