Service Exchange Of Scr Board With Primary Bypass; Service Exchange Of Scr Board With Secondary Bypass - GE Digital Energy STS-230-25-2-RM Installation And Operating Manual

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Digital Energy Static Transfer Switch
4.3.3

Service exchange of SCR Board with primary bypass

The following procedure allows uninterruptible exchange of SCR Board with primary bypass connected.
1. Bypass load to primary source (chapter 4.2.1).
2. Make sure that the Integrated Switch is in "2 PRIMARY BYPASS STS ISOLATED" position.
3. Open front panel of STS Board.
4. Disconnect Control Panel (ribbon cable inside of STS Board).
5. Check absence of voltages on PRIMARY SOURCE and SECONDARY SOURCE terminals of
STS Board with proper voltmeter.
6. Disconnect connections between boards: PRIMARY SOURCE, SECONDARY SOURCE, STS
OUTPUT, RELAY COMMUNICATION TERMINAL BLOCK and finally grounding connection (PE).
7. Take out the SCR Board.
8. Put in and screw in spare SCR Board (Advisably spare redundant board should be stored for
servicing).
9. Make necessary connections between upper and lower boards: as first grounding connection (PE)
and then PRIMARY SOURCE, SECONDARY SOURCE, STS OUTPUT and RELAY
COMMUNICATION TERMINAL BLOCK.
10. Connect Control Panel to STS Board (ribbon cable).
11. Close front panel of STS Board.
12. Proceed with section 4.2.2: "return from primary bypass" procedure.
4.3.4

Service exchange of SCR Board with secondary bypass

The following procedure allows uninterruptible exchange of SCR Board with secondary bypass connected.
1. Bypass load to secondary source (chapter 4.2.3).
2. Make sure that the Integrated Switch is in "2 SECONDARY BYPASS STS ISOLATED" position.
3. Open front panel of STS Board.
4. Disconnect Control Panel (ribbon cable inside of STS Board).
5. Check absence of voltages on PRIMARY SOURCE and SECONDARY SOURCE terminals of
STS Board with proper voltmeter.
6. Disconnect connections between boards: PRIMARY SOURCE, SECONDARY SOURCE, STS
OUTPUT, RELAY COMMUNICATION TERMINAL BLOCK and finally grounding connection (PE).
7. Take SCR Board out.
8. Put in and screw in spare SCR Board (Advisably spare redundant board should be stored for
servicing).
9. Make necessary connections between upper and lower boards: as first grounding connection (PE)
and then PRIMARY SOURCE, SECONDARY SOURCE, STS OUTPUT and RELAY
COMMUNICATION TERMINAL BLOCK.
10. Connect Control Panel to STS Board (ribbon cable).
11. Close front panel of STS Board.
12. Proceed with section 4.2.4: "return from secondary bypass" procedure.
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GE DE STS: installation and operating manual 1.2 (GB)
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