5.7 CONTROL ELEMENTS
Consider an application where the selector switch is used to control setting groups 1 through 4 in the relay. The setting
groups are to be controlled from both user-programmable pushbutton 1 and from an external device via contact inputs 1
through 3. The active setting group shall be available as an encoded three-bit word to the external device and SCADA via
output contacts 1 through 3. The pre-selected setting group shall be applied automatically after 5 seconds of inactivity of
the control inputs. When the relay powers up, it should synchronize the setting group to the three-bit control input.
Make the following changes to setting group control in the
SETTING GROUPS FUNCTION:
SETTING GROUPS BLK:
GROUP 2 ACTIVATE ON:
GROUP 3 ACTIVATE ON:
Make the following changes to selector switch element in the
menu to assign control to user programmable pushbutton 1 and contact inputs 1 through 3:
SELECTOR SWITCH 1
changed to 4 with
changed to 1 with
a 3-bit input
Figure 5–120: ACKNOWLEDGE MODE
"SELECTOR 1 POS 2"
"SELECTOR 1 POS 3"
L90 Line Current Differential System
changed to 2 with
"SELECTOR 1 POS 4"
GROUP 4 ACTIVATE ON:
GROUP 5 ACTIVATE ON:
GROUP 6 ACTIVATE ON: