Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 70
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 100 milliseconds after the load current and source voltage return to
normal, and transfers are no longer inhibited. In manual mode, the alarm remains active and transfers 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.
SCR fault 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 5 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:
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 80
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 68. The Freeze function is hard-coded and cannot be changed for an event.
If the front panel of your Liebert STS2 has LED’s and push buttons instead of the touchscreen interface, you can
view these messages via the RS-232 port. See 12.1.1 - Connecting and Using a Terminal on page 74 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 Liebert STS2
LED Display for more information about the LED’s.
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