OPM_STS_400_25A_100_1GB_V011
25
GE DE STS: installation and operating manual 1.1 (GB)
Digital Energy
™
Static Transfer Switch
g
4.2.2 Return from primary bypass mode to STS operation
Initial states of the switches are described in table 4 (figure 9). The Interlock Plate is set in PRIMARY
BYPASS position. Return from bypassing to STS primary source operation is achieved by the following
steps:
1. Set button “PREFERRED SOURCE” into “PRIMARY” position (button is released if primary
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 K4 STS PRIMARY SOURCE into “ON” position.
6. Check if LEDs on the control panel indicate that the primary source is preferred, healthy and
currently supplying the load.
7. Set switch K3 STS OUTPUT into “ON” position.
8. Set switch K1 STS PRIMARY BYPASS into “OFF” position.
9. Move the Bypass Interlock Plate into “NORMAL MODE” position.
10. Set switch K5 STS SECONDARY 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 5 (figure 8).
Table 5
K1 STS
PRIMARY BYPASS
OFF
K2 STS
SECONDARY BYPASS
OFF
K3 STS
OUTPUT
ON
K4 STS
PRIMARY SOURCE
ON
K5 STS
SECONDARY SOURCE
ON
