CHAPTER 8: CONTROL LOCAL CONTROL MODE (BREAKERS AND SWITCHES)
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 8–7
Figure 8-4: SLD Pushbutton “Block” logic diagram
PB “Bypass” (Hardcoded SLD Pushbutton)
Blocking of the command can be bypassed using the SLD pushbutton “Bypass” (see Figure
8-5:SLD Pushbutton “Bypass Block” logic diagram). When pressed, the previously applied
block is bypassed (see figures: Local Control for breakers/Local Control for contactor). For
example if the block was applied when the Breaker/Switch was opened, pressing the PB
“Bypass” will allow closing command. If the bypass is active for the selected breaker or
switch, a letter “By” appears next to the symbol in the SLD.
Figure 8-5: SLD Pushbutton “Bypass Block” logic diagram
894197A1.cdr
FLEXLOGIC OPERAND
BKR [X] Selected
SW [X] Selected
AND
S
Latch
R
Non-Volatile Latch
Reset-Dominant
positive
one shot
Block
PB “BLOCK”
AND
FLEXLOGIC OPERAND
Block ON
FLEXLOGIC OPERAND
Block OFF
OR
FLEXLOGIC OPERAND
SBO Enabled
894198A1.cdr
FLEXLOGIC OPERAND
BKR [X] Selected
SW [X] Selected
AND
S
Latch
R
Non-Volatile Latch
Reset- Dominant
positive
one shot
Byp Blk
PB “BYPASS
BLOCK”
AND
FLEXLOGIC OPERAND
Bypass Block ON
FLEXLOGIC OPERAND
Bypass Block OFF
OR
FLEXLOGIC OPERAND
SBO Enabled
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