OPM_STS_230_25A_2RM_1GB_V012
21
GE DE STS: installation and operating manual 1.2 (GB)
Digital Energy
™
Static Transfer Switch
g
4.3 Service
The SCR Board may be taken out without interruption of the power supplied to the load only if the Integrated
Switch has been previously set into either “2 PRIMARY BYPASS STS ISOLATED” or “2 SECONDARY
BYPASS STS ISOLATED” position.
4.3.1
STS operation test
1. Make sure that both sources are healthy (their LEDs are on) and that both sources are
synchronized.
2.
Set the secondary source as preferred, using the PREFERRED button.
3. The STS transfers the load to the secondary source within 8 seconds. You can check it with an
oscilloscope.
4.
Set the primary source as preferred using the PREFERRED button.
5. The STS transfers the load to the primary source within 8 seconds. You can check it with an
oscilloscope.
NOTE
The next step can cause loss of output voltage if the SECONDARY SOURCE
or the STS is out of order.
6.
Set the Integrated Switch into “1 SECONDARY BYPASS” position.
7.
The STS immediately transfers the load to the secondary line. You can check the output transfer
time locking output voltage waveform during transfer with an oscilloscope.
8.
Set the Integrated Switch into “0 NORMAL” position.
9. The STS transfers the load to preferred primary line within 8 seconds. You can check it with an
oscilloscope.
10. Set secondary line as preferred one using PREFERRED button
NOTE
The next step can cause loss of output voltage if the PRIMARY SOURCE or
the STS is out of order.
11. Set the Integrated Switch into “1 PRIMARY BYPASS” position.
12. The STS immediately transfers the load to the primary line. You can check the output transfer time
locking output voltage waveform during transfer with an oscilloscope.
13. Set the Integrated Switch into “0 NORMAL” position.
14. The STS transfers load to preferred secondary line within 8 seconds. You can check it with an
oscilloscope.
