Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 84
The History Log has the following fields:
• Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN buttons to set the time.
• Status — the status of the Liebert STS2/PDU 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
the user manually presses the RESET button. In either case, the cause of the Source 1 or Source 2 Ipeak 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 13 lists available event messages, a definition of the event and the functions that are activated 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
button has been pressed.
E — By default, all faults and alarms are written to the Event Log. See 12.1.4 - Setting Event Masks with the Terminal.
All of these functions, except Freeze, can be reconfigured to trigger for each event, using the Event Mask option.
See 11.1 - Event Mask. The Freeze function is hard-coded and cannot be changed for a event.
Table 13 Event messages
ID Alarm Message Description/Cause Action
1 S1 SCR SHORT One or more of the SCRs for Source 1 have shorted and failed. D, F, A, E
2 S2 SCR SHORT One or more of the SCRs for Source 2 have shorted and failed. D, F, A, E
3 S1 SCR OPEN One or more of the SCRs for Source 1 is open. D, F, A, E
4 S2 SCR OPEN One or more of the SCRs for Source 2 is open. D, F, A, E
5 PRIMARY FAN FAIL
A primary cooling fan has failed and the unit is now being cooled by a secondary
fan, which is not monitored.
D, A, E
6 CONTROL MODULE FAIL Control logic module has failed. D, A, E
7 PWR SPLY DC A FAIL Power supply DC bus A has failed. D, A, E
8 PWR SPLY DC B FAIL Power supply DC bus B has failed. D, A, E
9 PWR SPLY S1 AC FAIL Power supply Source 1 AC has failed. D, A, E
10 PWR SPLY S2 AC FAIL Power supply Source 2 AC has failed. D, A, E
11 PWR SPLY LOGIC FAIL A power supply module has failed. D, A, E
12 OUT VOLT SENSE FAIL The output volt sense module failed D, A, E
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