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Digital Energy
Static Transfer Switch
3.5
Connection
3.5.1
Connection with optional Switch Board
If the STS is equipped with the optional Switch Board, proceed as follows:
1.
Switch off the supply in both supplying lines outside the STS-230-XX. Switches for both sources
may be placed in some distance to the STS depending on the topology of the rest of the power
system.
2.
Check the absence of the voltage in the two input lines with a proper voltmeter.
3.
Unscrew 4 screws from the Switch Board (figure 3), and take out the front cover plate.
4.
Unscrew 4 screws from STS Board (figure 3), disconnect the Control Panel (ribbon cable inside
STS Board) and take out the front cover plate.
5.
Connect wires outgoing from the top part of the lower board into the proper terminals in the upper
board (figure 5).
6.
Turn the Integrated Switch placed on the Switch Board into position "0 NORMAL".
7.
Firmly connect three wires coming from the first supplying device (PRIMARY SOURCE) into the
X01 PRIMARY SOURCE terminal and one of the PE terminals placed on the Switch Board.
8.
Firmly connect three wires coming from the second supplying device (SECONDARY SOURCE)
into the X02 SECONDARY SOURCE terminal and one of the PE terminals placed on the Switch
Board.
9.
Firmly connect wires going to the load (OUTPUT) into the X03 OUTPUT terminal and one of the
PE terminals placed on the Switch Board.
10 Check the connection of three external lines. Especially the output line going to the load should be
connected to the proper terminal in the STS.
11 Reinstall the covers of both boards and fasten them with screws. Remember to connect the ribbon
cable inside the STS Board.
3.5.2
Connection without Switch Board
If the STS is not equipped with the optional Switch Board, proceed as follows:
1.
Switch off the supply in both supplying lines outside the STS. Switches for both sources may be
placed in some distance to the STS depending on the topology of the rest of the power system.
2.
Check the absence of the voltage in two input lines with a proper voltmeter.
3.
Unscrew 4 screws from the STS Board (figure 3), disconnect the Control Panel (ribbon cable
inside STS Board) and take out the front cover plate of the STS Board.
4.
Firmly connect three wires coming from the first supplying device (PRIMARY SOURCE) into the
PRIMARY SOURCE terminal and one of the PE terminals placed on the STS Board.
5.
Firmly connect three wires coming from the second supplying device (SECONDARY SOURCE)
into the SECONDARY SOURCE terminal and one of the PE terminals placed on the STS Board.
6.
Firmly connect wires going to the load (OUTPUT) into the STS OUTPUT terminal and one of the
PE terminals placed on the STS Board.
7.
Check connection of three external lines. Especially the output line going to the load should be
connected to the right terminal in the STS.
8.
Reinstall the cover of the STS Board and fasten it with screws. Remember to connect the ribbon
cable inside the STS Board.
OPM_STS_230_25A_2RM_1GB_V012
15
GE DE STS: installation and operating manual 1.2 (GB)
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