8–8 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
LOCAL CONTROL MODE (BREAKERS AND SWITCHES) CHAPTER 8: CONTROL
PB “Tag” (hardcoded SLD pushbutton)
Lockout/Tagout is a practice and procedure to safeguard employees from unexpected
energization or startup of machinery and equipment, or hazardous energy during service
or maintenance activities. If a breakeror disconnect switch is tagged, the open and close
controls are inhibited.
Both remote and local control commands are blocked if the tagged operand BKR# Tag ON,
or SW# Tag ON is active for the selected particular breaker or switch respectively. The
breaker or switch is tagged by pressing the SLD pushbutton “Tag”. If the selected switching
device is tagged, a letter “T” appears under its symbol. Tagging can be achieved in local
mode using the front panel control from the configurable SLD screens. The Pushbutton
“Tag” logic diagram shows the tagging logic diagram for a switch. The logic applies to one
breaker or switch at the time in the single line diagram.
Figure 8-6: Pushbutton “Tag” logic diagram
FAST PATH:
The pushbuttons, Tag, Block and Bypass Block are used for both breakers and switches
when selected in the SLD. Only one component at the time can be selected in the SLD.
FAST PATH:
Tagging, blocking, or bypassing block can be performed in Local Mode, and only when the
component (breaker or switch) is selected in the SLD. The applied action of tagging,
blocking or bypassing block is retained for this component after it’s been deselected. To
change the status of the applied action, the component need be reselected.
FAST PATH:
The Local Mode control allows programming of separate pair of PBs for Open and Close
commands to breakers and for Open and Close commands to switches. If desired, one pair
of pushbuttons can be programmed for Open and Close commands to both breakers and
switches.
FLEXLOGIC OPERAND
BKR [X] Selected
SW [X] Selected
AND
S
Latch
R
Non-Volatile
Latch
Reset-
Dominant
positive
one shot
Tag
PB “TAG”
AND
FLEXLOGIC OPERAND
Tag ON
FLEXLOGIC OPERAND
Tag OFF
SETTING
TAGGING
Enabled = 1
OR
FLEXLOGIC OPERAND
SBO Enabled
894199A1.cdr
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