OPM_STS_400_25A_100_1GB_V011
29
GE DE STS: installation and operating manual 1.1 (GB)
Digital Energy
™
Static Transfer Switch
g
4.3 Service
4.3.1 STS operation test
1. Check if both sources are healthy (their LEDs are on) and if both sources are synchronized.
2. Set secondary source as preferred, using the PREFERRED button.
3. The STS transfers the load to the secondary source within 30 seconds; the transfer time depends
on the dipswitch settings.
4. Set primary source as preferred using the PREFERRED button.
5. The STS transfers the load to primary source within 30 seconds; the transfer time depends on the
dipswitch settings.
NOTE
The next step can cause loss of output voltage if the SECONDARY SOURCE
or the STS is out of order.
6. Switch off K4 PRIMARY SOURCE.
7. STS immediately transfers the load to the secondary source. You can check the output transfer
time locking output voltage waveform during transfer by oscilloscope.
8. Switch on K4 PRIMARY SOURCE.
9. STS transfers the load to the preferred primary source within 30 seconds; the transfer time
depends on the dipswitch settings.
10. Set the secondary source 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. Switch off K5 SECONDARY SOURCE.
12. The STS immediately transfers the load to the primary source. You can check the output transfer
time locking output voltage waveform during transfer by oscilloscope.
13. Switch on K5 SECONDARY SOURCE.
14. The STS transfers load to the preferred secondary source within 30 seconds. The transfer time
depends on the dipswitch settings.
