Schweitzer Engineering SEL-351P - Logic Outputs; DSTRT - Directional Carrier Start; NSTRT - Nondirectional Carrier Start; STOP - Stop Carrier

5-26 Trip and Target Logic Date Code 990215
SEL-351P Manual Técnico
Logic Outputs
The following logic outputs can be tested by assigning them to output contacts. See Output
Contacts in Section 7: Inputs, Outputs, Timers, and Other Control Logic for more information
on output contacts.
DSTRT – Directional Carrier Start
Program an output contact for directional carrier start. For example, SEL
OGIC Control Equation
setting OUT105 is set:
OUT105 = DSTRT
Output contact OUT105 drives a communications equipment transmitter input in a two-terminal
line application (see
Figure SECTION 5: .15).
In a three-terminal line scheme, output contact OUT107 is set the same as OUT105 (see
Figure
SECTION 5: .16):
OUT107 = DSTRT
DSTART includes current reversal guard logic.
NSTRT – Nondirectional Carrier Start
Program an output contact to include nondirectional carrier start, in addition to directional start.
For example, SEL
OGIC Control Equation setting OUT105 is set:
OUT105 = DSTRT + NSTRT
Output contact OUT105 drives a communications equipment transmitter input in a two-terminal
line application (see
Figure SECTION 5: .15).
In a three-terminal line scheme, output contact OUT107 is set the same as OUT105 (see
Figure
SECTION 5: .16):
OUT107 = DSTRT + NSTRT
STOP – Stop Carrier
Program to an output contact to stop carrier. For example, SEL
OGIC Control Equation setting
OUT106 is set:
OUT106 = STOP
Output contact OUT106 drives a communications equipment transmitter input in a two-terminal
line application (see
Figure SECTION 5: .15).
In a three-terminal line scheme, output contact OUT104 is set the same as OUT106 (see
Figure
SECTION 5: .16):
OUT104 = STOP