Siemens SIPROTEC 7SD80 Manual page 74

Functions
2.2 Phase Comparison Protection and Ground Differential Protection
There are two ways to set the commissioning mode. The first way is to use a command (commissioning mode
on / commissioning mode off) which is generated either when operating the integrated keypad or when oper-
ating with DIGSI. The second way is to use the binary inputs (no. 3260 „>Comm. 87 ON", no. 3261 „>Comm.
87 OFF").
Depending on the way used for controlling the commissioning mode, either the indication „Comm 87 ON/OFF"
(no. 3262) or „Comm 87 ONoffBI" (no. 3263) is generated. The way used for deactivating the commissioning
mode always has to be identical to the way used for activating. The indication „Commiss.87" (no. 3191) is
generated independently of the chosen way.
The following figures show possible variants for controlling the binary inputs. If a switch is used for control
(Figure 2-23), it has to be observed that binary input „>Comm. 87 ON" (no. 3260) is parameterized as NO
contact and that binary input „>Comm. 87 OFF" (no. 3261) is parameterized as NC contact.
Figure 2-22 External push-button wiring for controlling the differential protection commissioning mode
Bu1 Push-button „Switching off the differential protection commissioning mode"
Bu2 Push-button „Switching on the differential protection commissioning mode"
Figure 2-23 External switch wiring for controlling the differential protection commissioning mode
S Switch „Switching the differential protection commissioning mode on/off"
1) Binary input as make contact
2) Binary input as break contact
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SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011