OPM_STS_400_25A_100_1GB_V011
9
GE DE STS: installation and operating manual 1.1 (GB)
Digital Energy
™
Static Transfer Switch
g
Five switches (figure 3) are set from the front panel without need for taking out the panel. These switches are
equipped with a mechanical interlock that prevents against short circuit between both supplying sources. Each
of them may be set manually into one of two positions: either “ON” or “OFF”. The device operates in STS mode
if the switches are set as in table 1.
Table 1
K1 STS
PRIMARY BYPASS
OFF
K2 STS
SECONDARY BYPASS
OFF
K3 STS
OUTPUT
ON
K4 STS
PRIMARY SOURCE
ON
K5 STS
SECONDARY SOURCE
ON
In normal mode of operation, the process of transferring the supply from one input to the other one is performed
automatically. The start up procedure is described in chapter 3, operation is explained in chapter 4.
The device is equipped with a mechanical interlock plate that prevents against unintentional short circuit during
manipulation with high current switches. The interlock plate is being moved aside during manipulation and may
be set in three positions: SECONDARY BYPASS, NORMAL MODE and PRIMARY BYPASS. The interlock
plate is equipped with a knurled nut that is screwed after a change of plate position. In that way the interlock
plate positions are locked with the knurled nut to prevent unintentional move of the plate.
Figure 2. STS front
