5.6
SEL-311C Relay Instruction Manual Date Code 20060320
Trip and Target Logic
Trip Logic
Input IN101 must be energized (52b circuit breaker auxiliary contact has to be
closed) before the trip logic unlatches and the TRIP Relay Word bit deasserts
to logical 0.
Program an Output
Contact for Tripping
In the factory settings, the resultant of the trip logic in Figure 5.1 is routed to
output contacts OUT101 and OUT102 with the following SEL
OGIC control
equation settings:
OUT101 = TRIP
OUT102 = TRIP
If more than two TRIP output contacts are needed, program other output
contacts with the TRIP Relay Word bit. Examples of uses for additional TRIP
output contacts:
➤ Keying an external breaker failure relay
➤ Keying communications equipment in a Direct Transfer Trip
scheme
See Output Contacts on page 7.32 for more information on programming
output contacts.
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