Schweitzer Engineering Laboratories SEL-751 - Table 4.65 Control Output Equations and Contact Behavior Settings

4.168
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Logic Settings (SET L Command)
➤ When input SC01CU has a rising edge, a rising edge on
SC01CD is ignored (unless SC01 is already at the maximum
value SC01PV (= 7), in which case SC01CU is ignored, and the
SC01CD is processed). An example of this exception appears
in the previous diagram, just before the “one processing
interval” notation.
A maintained logical 1 state on the SC01CU or SC01CD inputs is ignored
(after the rising edge is processed). A rising edge received on the SC01CU or
SC01CD inputs is ignored when the SC01R or SC01LD inputs are asserted.
A maintained logical 1 on the SC01CU or SC01CD inputs does not get treated
as a rising edge when the SC01R or SC01LD input deasserts.
The same operating principles apply for all of the counters: SC01–SCmm,
where mm = the number of enabled counters. When a counter is disabled by
setting, the present count value is forced to 0 (SCnn := 0), causing Relay Word
bit SCnnQD to assert (SCnnQD := logical 1), and Relay Word bit SCnnQU to
deassert (SCnnQU := logical 0).
Output Contacts
The SEL-751 provides the ability to use SELOGIC control equations to map
protection (trip and warning) and general-purpose control elements to the out-
puts. In addition, you can enable fail-safe output contact operation for relay
contacts on an individual basis.
Table 4.65 Control Output Equations and Contact Behavior Settings
Setting Prompt Setting Range Setting Name := Factory Default
OUT101 FAIL-SAFE Y, N OUT101FS := Y
OUT101 SEL
OGIC OUT101 := HALARM OR SALARM
OUT102 FAIL-SAFE Y, N OUT102FS := N
OUT102 SEL
OGIC OUT102 := CLOSE
OUT103 FAIL-SAFE Y, N OUT103FS := N
OUT103 SEL
OGIC 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 SEL
OGIC OUT403 := 0
OUT404 FAIL-SAFE Y, N OUT404FS := N
OUT404 SEL
OGIC 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.
NOTE: Fast hybrid contacts are
designed for fast closing (50 s) only.
Fail-safe mode operating time (time
to open the contacts) for fast hybrid
contacts is <8 ms (same time as for a
normal output contact).