Date Code 990215
Trip and Target Logic
5-23
SEL-351P Manual Técnico
Figure SECTION 5: .11:
Unblocking Block Logic Routing to Trip Logic
PTRX1, PTRX2 – Permissive Trip Receive Outputs
In two-terminal line DCUB applications (setting ECOMM = DCUB1), PTRX1 asserts for loss-
of-channel or an actual received permissive trip.
In three-terminal line DCUB applications (setting ECOMM = DCUB2), PTRX1 or PTRX2 assert
for loss-of-channel or an actual received permissive trip (for the respective Channel 1 or 2).
The PTRX1/PTRX2 Relay Word bits are then routed in various combinations in Figure
SECTION 5: .7 to control Relay Word bit PTRX, depending on enable setting
ECOMM = DCUB1 or DCUB2. Relay Word bit PTRX is the permissive trip receive input into
the trip logic in Figure SECTION 5: .1.
Installation Variations
Figure SECTION 5: .13 shows output contacts OUT105 and OUT107 connected to separate
communications equipment, for the two remote terminals. Both output contacts are programmed
the same (OUT105 = KEY and OUT107 = KEY).
Depending on the installation, perhaps one output contact (e.g., OUT105 = KEY) could be
connected in parallel to both transmitter inputs (TX) on the communications equipment in Figure
SECTION 5: .13. Then output contact OUT107 can be used for another function.
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