Schweitzer Engineering Laboratories SEL-351A - Output Contacts

7.31
Date Code 20080213 Instruction Manual SEL-351A Relay
Inputs, Outputs, Timers, and Other Control Logic
Output Contacts
Output Contacts
Figure 7.26 shows the example operation of output contact Relay Word bits
(OUT101–OUT107) as a result of:
➤ SELOGIC control equation operation (e.g., SELOGIC control
equation settings OUT101–OUT107 in Figure 7.26) or
➤ PULSE command execution
The output contact Relay Word bits in turn control the output contacts (e.g.,
output contacts OUT101–OUT107 in Figure 7.26).
Alarm logic/circuitry controls the ALARM output contact (see Figure 7.26)
Figure 7.26 is used for the following discussion/examples.
Factory Settings
Example
In the factory SELOGIC control equation settings, three output contacts are
used:
OUT101 = TRIP (overcurrent tripping/manual tripping; see Section 5: Trip
and Target Logic)
OUT102 = CLOSE (automatic reclosing/manual closing; see Section 6: Close
and Reclose Logic)
OUT103 = SV1T (breaker failure trip; see SELOGIC Control Equation
Variables/Timers on page 7.27)
OUT104 = 0 (output contact OUT104 not used—set equal to zero)
•
•
•
OUT107 = 0 (output contact OUT107 not used–set equal to zero)
Operation of Output
Contacts for
Different Output
Contact Types
Output Contacts OUT101–OUT107
Refer to Figure 7.26.
The execution of the serial port command PULSE n (n = OUT101–OUT107)
asserts the corresponding Relay Word bit (OUT101–OUT107) to logical 1.
The assertion of SEL
OGIC control equation setting OUTm (m = 101–107) to
logical 1 also asserts the corresponding Relay Word bit OUTm (m = 101–107)
to logical 1.
The assertion of Relay Word bit OUTm (m = 101–107) to logical 1 causes the
energization of the corresponding output contact OUTm coil. Depending on
the contact type (a or b), the output contact closes or opens as demonstrated in
Figure 7.26. An a-type output contact is open when the output contact coil is
de-energized and closed when the output contact coil is energized. A b-type
output contact is closed when the output contact coil is de-energized and open
when the output contact coil is energized.
Courtesy of NationalSwitchgear.com