9328900990 Rev L BE1-951 Application 8-35
Table 8-17. BUS Contact Sensing Input Logic
State Labels
Input Purpose Name Label
Energized De-Energized
IN1 51b breaker status. BREAKER OPEN CLOSED
IN2
Blocks instantaneous when feeder relay
picks up.
FEEDER_PU PICKUP NORMAL
IN3
Signal from bus source relay using
BACKUP logic that a feeder relay is out of
service.
BACKUPMODE BACKUP NORMAL
IN4
Places the relay in Test mode so that all
trips are rerouted to OUT1 when IN4 de-
energizes.
TESTDISABL NORMAL TSTMODE
Table 8-18. BUS Function Block Logic
Function Purpose
BESTlogic
Expression
Mode
Setting
50TP
Inhibit when feeder fault is indicated by feeder relay pickup.
Requires a 2 to 4 cycle coordination delay. Used for high-
speed bus fault tripping or for feeder instantaneous tripping
when in feeder backup mode.
IN2 1 (enabled)
50TN
Inhibit when feeder fault is indicated by feeder relay pickup.
Requires a 2 to 4 cycle coordination delay. Used for high-
speed bus fault tripping or for feeder instantaneous tripping
when in feeder backup mode.
IN2
1 (3 Phase
Residual)
50TQ
Inhibit when feeder fault is indicated by feeder relay pickup.
Requires a 2 to 4 cycle coordination delay. Used for high-
speed bus fault tripping or for feeder instantaneous tripping
when in feeder backup mode.
IN2 1 (enabled)
150TP N/A 0 0 (disabled)
150TN N/A 0 0 (disabled)
150TQ N/A 0 0 (disabled)
51P N/A 0 1 (enabled)
51N N/A 0
1 (3 Phase
Residual)
51Q N/A 0 1 (enabled)
151N N/A 0 0 (disabled)
24 N/A 0 0 (disabled)
27P N/A 0 0 (disabled)
27X N/A 0 0 (disabled)
59P N/A 0 0 (disabled)
159P N/A 0 0 (disabled)
159X N/A 0 0 (disabled)
47 N/A 0 0 (disabled)
25 N/A 0 0 (disabled)
81 N/A 0 0 (disabled)
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