Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 16
6.5 Remote Source Selection
The Remote Source Selection allows the preferred input source to be chosen from a remote location. A user
supplied normally open dry contact allows the user to remotely select a source to be the preferred source in the
same process as the local source transfer selection.
If both the input contacts are closed, the current selected preferred source shall be retained. If the unit’s
preferred source selection and Remote Source Selection are active at the same time,
the Liebert STS2/PDU follows the last request for a preferred source change, regardless of whether it was from
the local or Remote Source Selection controls.
See 10.3 - Enabling Remote Source Selection for instructions on enabling the Remote Source Selection.
See Figures 47 and 48 for the location of the Remote Source Selection option.
See 4.4 - Remote Source Selection Wiring and Figure 55 for information on the control wiring.
6.6 Key Lockout Switch
The key lockout switch activates a software lockout of the touchscreen to prevent manual transfers and
configuration changes. When locked out, the touchscreen becomes a read-only display. A key is needed to do
manual transfers or change settings.
The alarm silence button is not disabled when in the lockout position.
The switch is located on the front of the unit next to the display; it is behind the front door but can be operated
without opening the front door. See Figures 20 through 22 for the key lockout switch location on each unit.
See 13.2.1 - Security and Figure 64 for instructions on using the key lockout switch.
6.7 Static Switch Redundant Output Breaker
A plug-in, non-automatic circuit breaker is provided which allows redundancy in the static switch output power
path. The breaker is connected in parallel with the static switch output plug-in non-automatic circuit breaker.
6.8 Inline Panelboards
An output distribution cabinet with either Square D or General Electric inline panelboards with copper bus to
accept bolt-in or plug-in circuit breakers. Each panelboard is individually protected by a 225A, 3-pole panelboard
main circuit breaker.
Each panelboard includes a separate isolated neutral bus bar and a safety-ground bus bar for the neutral and
safety-ground connections for at least 42 output circuits.
6.9 I-Line Panelboards
An output distribution cabinet with one vertically mounted Square D I-Line panelboard with copper bus to
accept Square D three phase plug-in circuit breakers. The panelboard must be enclosed with an accent cover.
6.10 Subfeed Breakers
Breakers for feeding remote panelboard(s) or other loads. Available in ratings of 225A or 400A.
6.11 K-Factor Transformers
U.S. Department of Energy compliant K20-rated double-shielded copper isolation transformer specially designed
to accommodate highly nonlinear loads in accordance with UL 1561 (in place of standard isolation transformer).
6.12 Surge Suppression System
A fused and monitored high-energy, 80 kAmp/phase surge suppression system by Control Concepts connected
to each input of the unit for superior surge suppression.
NOTE
Only available on units with inline panelboards. 400A breaker not available on 250A units.
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