Date Code 20001006 Trip and Target Logic 5-33
SEL-351 Instruction Manual
Figure 5.17: Seal-in of Breaker Failure Occurrence for Message Display
If a breaker failure trip has occurred, the momentary assertion of SV7T (breaker failure trip) will
cause SV8 in Figure 5.17 to seal-in. Asserted SV8 in turn asserts DP3, causing the message:
BREAKER FAILURE
to display in the rotating default display.
This message can be removed from the display rotation by pushing the TARGET RESET
Pushbutton (Relay Word bit TRGTR pulses to logical 1, unlatching SV8 and in turn deasserting
DP3). Thus, front-panel rotating default displays can be easily reset along with the front-panel
targets by pushing the TARGET RESET Pushbutton.
Courtesy of NationalSwitchgear.com
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