6.12
SEL-551 Relay Instruction Manual Date Code 20110408
Front-Panel Interface
Rotating Default Display
The following table and figures demonstrate the correspondence between
changing display point states (e.g., DP2 and DP4) and enabled display point
labels (DP2_1/DP2_0 and DP4_1/DP4_0, respectively). The display is on a
two-second rotation for each screen.
The display point factory settings are:
DP2 = LB1 (local bit LB1)
DP4 = IN1 (optoisolated input IN1)
Local bit LB1 is used as a recloser enable/disable local control switch (see
Local Control Switches on page 3.5).
Optoisolated input IN1 is used as a circuit breaker status input (a 52a circuit
breaker auxiliary contact is connected to input IN1; see Optoisolated Inputs on
page 3.3).
SCHWEITZER ENGINEE
PULLMAN WASHINGTON USA
FAULT TYPE
A
INSTEN BCNRSLO
79
Press CNTRL for
Local Control
79 DISABLED
BREAKER OPEN
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