Vertiv Liebert STS2/PDU - Enabling Remote Source Selection

Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 64
10.3 Enabling Remote Source Selection
If your system is equipped with the optional Remote Source Selection option, it must be enabled.
If you your system includes the Color Graphical Display:
1. Select CONFIG from the menu bar.
2. Select SYSTEM SETTINGS from the Configuration menu.
3. Select SYSTEM OPTIONS from the System Settings menu.
4. Select YES for the REMOTE SOURCE SELECT choice.
If your system contains the LED display or you are configuring the system from the RS-232 port, see 12.1 - Using
the RS-232 Port on page 73 for instructions on using the that interface.
10.4 Maintenance Bypass
The Liebert STS2 is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow manual bypass
of the switch electronics for either input source in the event of switch failure or for maintenance of the switch.
Refer to the static transfer switch one-line diagram (Figure 2). While operating on maintenance bypass, all
voltages are removed from the Liebert STS2 electronics to facilitate safe repair, without de-energizing the load
using a make-before-break switching sequence.
However, the unit can be bypassed using a make-before-break switching sequence only to the same source to
which that the switch is connected, as indicated by the highlighted static transfer switch box on the Mimic
screen.
In the event of source or switch failure, the unit should be bypassed only to the current input source. For
convenience, instructions for the bypass procedure can be displayed on the touchscreen by selecting the BYP.
PROC option from the menu bar.
The Mimic is used to verify the status of the unit during the bypass procedures. In the unlikely event that the
Color Graphical Display is not available, open the front door and look through the slots in the control door. If you
can see green LED’s on the gate driver board through that slot, then the unit is connected to the source
referenced on the label below that slot. See Figure 43.