Vertiv Liebert STS2 - Remote Source Selection Wiring

Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 12
4.4 Remote Source Selection Wiring
An optional Remote Source Selection board may be installed in your Liebert STS2/PDU. This board is installed in the
same bay as the communications options. See Figures 47 and 48 for the location of these options. See Figure 55 for
information on the control wiring for the Remote Source Selection option.
The Remote Source Selection allows you choose the preferred input source from a remote location.
Terminal connections allow the customer 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.
A six pin terminal block provides the Remote Source Selection connections. Two pairs of wires are used from the
switch to trigger the source selection. You can select the type of switch used for this remote control.
Connections are made to four of the connections, using Form A dry contacts. The contacts are numbered left to
right:
See 10.3 - Enabling Remote Source Selection for instructions on enabling the Remote Source Selection option.
4.5 Power Supply
The Liebert STS2/PDU is supplied with redundant power supplies that are designed to operate from a voltage
range of 200V to 600V. The unit is set at the factory to match the nameplate voltage. Field adjustments are not
necessary. If the unit needs to operate at a voltage other than what is listed on the nameplate, contact Vertiv
Services or your local Vertiv representative. Table 5 provides transformer tap information.
NOTICE
Using Table 5, ensure that the wiring for the control transformers matches the input voltage for the unit.
Improper wiring could result in blown fuses.
Table 4 Remote source selection terminal block
Contact
Connection
1Source 1
2 Isolated ground
3Source 2
4Isolated Ground
5 DO NOT USE
6 DO NOT USE
Table 5 Terminal block 1 and terminal block 2 wire connections
Voltage
Connect Connect
Jumper BetweenF1 TB1-XX F2 TB1-YY F3 TB2-XX F4 TB2-YY
200 1 9 1 9 1-7
220 2 12 2 12 6-8
380 1 8 1 8 2-7
415 1 10 1 10 4-7
600 1 12 1 12 6-7
208 1 10 1 10 1-7
240111111 1-7
400 1 9 1 9 3-7
480 1 11 1 11 5-7