Emerson Static Transfer Switch Remote Source Selection Wiring, Power Supply, Contact Connection

Power and Control Wiring

5.5Remote Source Selection Wiring

An optional Remote Source Selection board may be installed in your Liebert STS2. This board is installed in the same bay as the communications options. See Figures 21 and 22 for the location of these options. See Figure 23 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.

The unit’s preferred source selection and Remote Source Selection are active at the same time, with the Liebert STS2 following 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 con- tacts are numbered left to right:

Table 5	Remote source selection terminal block
Contact		Connection
1		Source 1
2		Isolated ground
3		Source 2
4		Isolated Ground
5		DO NOT USE
6		DO NOT USE

See 10.3 - Enabling Remote Source Selection for instructions on enabling the Remote Source Selection option.

5.6Power Supply

The Liebert STS2 is supplied with redundant power supplies that are designed to operate from a volt- age range of 200V to 600V. The unit is set at the factory to match the nameplate voltage. Field adjust- ments are not necessary. If the unit needs to operate at a voltage other than what is listed on the nameplate, contact Liebert Services or your local Emerson Network Power representative. Table 6 provides transformer tap information.

Table 6	Terminal block 1 and terminal block 2 wire connections
		Connect t		Connect
						Jumper
		F1	F2	F3	F4
Voltage		TB1-XX	TB1-YY	TB2-XX	TB2-YY	Between
200		1	9	1	9	1-7
208		1	10	1	10	1-7
220		2	12	2	12	6-8
240		1	11	1	11	1-7
380		1	8	1	8	2-7
400		1	9	1	9	3-7
415		1	10	1	10	4-7
480		1	11	1	11	5-7
600		1	12	1	12	6-7

! CAUTION

Using Table 6, ensure that the wiring for the control transformers matches the input voltage for the unit.

Improper wiring could result in blown fuses.

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