4.91
Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Logic Settings (SET L Command)
Output Contacts
The SEL-751A provides the ability to use SELOGIC control equations to map
protection (trip and warning) and general-purpose control elements to the
outputs. In addition, you can enable fail-safe output contact operation for relay
contacts on an individual basis.
If the contact fail-safe is enabled, the relay output is held in its energized
position when relay control power is applied. The output falls to its de-
energized position when control power is removed. Contact positions with de-
energized output relays are indicated on the relay chassis and in Figure 2.13
and Figure 2.14.
When TRIP output fail-safe is enabled and the TRIP contact is appropriately
connected (see Figure 2.16), the breaker is automatically tripped when relay
control power fails.
MIRRORED BITS
Transmit SEL
OGIC
Control Equations
See Appendix I: MIRRORED BITS Communications and SEL-751A Settings
Sheets for details.
Table 4.38 Control Output Equations and Contact Behavior Settings
Setting Prompt Setting Range Setting Name := Factory Default
OUT101 FAIL-SAFE Y, N OUT101FS := Y
OUT101 SELOGIC OUT101 := HALARM OR SALARM
OUT102 FAIL-SAFE Y, N OUT102FS := N
OUT102 SEL
OGIC OUT102 := CLOSE
OUT103 FAIL-SAFE Y, N OUT103FS := N
OUT103 SELOGIC OUT103 := TRIP
•
•
•
•
•
•
•
•
•
OUT401 FAIL-SAFE Y, N OUT401FS := N
OUT401 SEL
OGIC OUT401 := 0
OUT402 FAIL-SAFE Y, N OUT402FS := N
OUT402 SEL
OGIC OUT402 := 0
OUT403 FAIL-SAFE Y, N OUT403FS := N
OUT403 SELOGIC OUT403 := 0
OUT404 FAIL-SAFE Y, N OUT404FS := N
OUT404 SELOGIC OUT404 := 0
•
•
•
•
•
•
•
•
•
NOTE: When an output contact is not
used for a specific function you must
set the associated SEL
OGIC control
equation to either 0 or 1.
NOTE: Four digital outputs in Slot D
are shown. The outputs in Slots C and
E have similar settings.
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