Vertiv Liebert STS2 - Page 9

Vertiv™ Liebert® STS2
SL-20610_REV12_09-21 9 Guide Specifications
Proprietary and Confidential © 2021 Vertiv Group Corp.
CAN bus shall be used to communicate between the logic and the HMI as well as the options.
For remote monitoring, a serial RS-232 port shall provide present switch status information, alarm history
information and the history of status screens that are triggered upon a major alarm event.
Metering
The following metering parameters shall be displayed:
• Input AC voltage for both sources, line-to-line for each phase
• Input AC current for both sources for each phase
• Input frequency for both sources
• Output kVA
• Output kW
• Percent load
• Number of switch transfers
• Synchronization phase angle
All voltages and currents shall be measured using true-RMS techniques for accurate representation of
non-sinusoidal waveforms associated with computers and other electronic loads. The metering
parameters shall have a full-scale accuracy of ±2%.
Alarm Messages
Active alarms shall be monitored and displayed simultaneously as part of the LCD event panel. The
following alarm messages shall be displayed:
Source 1 Failure
CB1 (Source 1) Open
Power Supply S1 AC Failed
Source 2 Failure
CB2 (Source 2) Open
Power Supply S2 AC Failed
Sources Out of Sync
CB3 (Output) Open
Power Supply DC A Failed
Source 1 Overvoltage
CB3A Open (If used)
Power Supply DC B Failed
S1 Undervoltage (fast)
CB4 (S1 Bypass) Closed
Power Supply Logic Failed
S1 Undervoltage RMS (slow)
CB5 (S2 Bypass) Closed
S1 Voltage sense module failed
Source 2 Overvoltage
CB1 Shunt trip fail
S2 Voltage sense module failed
S2 Undervoltage (fast)
CB2 Shunt trip fail
S1 SCR sense module failed
S2 Undervoltage RMS (slow)
S1 SCR Open
S2 SCR sense module failed
Source 1 Overcurrent
S2 SCR Open
S1 Current sense module failed
Source 2 Overcurrent
S1 SCR Shorted
S2 Current sense module failed
Source 1 Over/Under
Frequency
S2 SCR Shorted
S1 Gate drive module failed
Source 2 Over/Under
Frequency
Primary fan failure
S2 Gate drive module failed
Source 1 Phase Rotation Error
Control Module Fail
Internal comm failed
Source 2 Phase Rotation Error
S1 I-peak
Option comm failed
Output undervoltage
S2 I-peak
Output voltage sense module
failed
STS on alternate source
Auto Retransfer Inhibit
Heatsink Overtemp
Transfer Inhibit
An audible alarm shall be activated when any of the alarms occurs. All alarms shall be displayed in text
form.