OPM_STS_400_25A_100_1GB_V011
28
GE DE STS: installation and operating manual 1.1 (GB)
Digital Energy
™
Static Transfer Switch
g
4.2.4
Return from secondary bypass mode to STS operation
Initial states of the switches are described in table 6 (figure 10). The Interlock Plate is set in SECONDARY
BYPASS position. Return from bypassing load to secondary source to STS operation is achieved by the
following steps:
1. Set button “PREFERRED SOURCE” into “SECONDARY” position (button is pushed if secondary
source is preferred).
2. Set button “OPERATION” into “AUTOMATIC” position (button is pushed in case of automatic
operation).
3. Open the door of the STS.
4. Unscrew the knurled nut that locks the Interlock Plate.
5. Set switch K5 STS SECONDARY SOURCE into “ON” position
6. Check if LEDs on the control panel indicate that the secondary source is preferred, healthy and
currently supplying the load.
7. Set switch K3 STS OUTPUT into “ON” position.
8. Set switch K2 STS SECONDARY BYPASS into “OFF” position.
9. Move the Bypass Interlock Plate into “NORMAL MODE” position.
10. Set switch K4 STS PRIMARY SOURCE into “ON” position.
11. Screw the knurled nut that locks the Interlock Plate.
After the procedure described above, the states of the switches should be as in table 7 (figure 8).
Table 7
K1 STS
PRIMARY BYPASS
OFF
K2 STS
SECONDARY BYPASS
OFF
K3 STS
OUTPUT
ON
K4 STS
PRIMARY SOURCE
ON
K5 STS
SECONDARY SOURCE
ON
