8-60
Application
BE1-951
O U T P U T
L O G I C
O P T O
O U T P U T
L O G I C
INI
62
B L K
IN1
52b
+
+
62
-
T R I P P I N G
L O G I C
5 2 T C
C L O S I N G
L O G I C
5 2 C C
O U T 2
O U T 1
+
-
52a
52b
5 2 T C
5 2 C C
D2590-10
03-23-98
V O 1
V O 2
V O 7
V O 6
Figure 8-21. Output Seal-In Logic Diagram
To prevent the output relay contacts from opening prematurely, a 200 millisecond hold timer can be selected
with the SG-HOLDn=1 command. Refer to Section 3,
Input and Output Functions, Outputs for more
information about this feature. If desired, seal-in logic with feedback from the breaker position logic can be
obtained by modifying the BESTlogic expression for the tripping output. To do this, set one of the general
purpose timers (62 or 162) for Mode 1 (Pickup/Dropout Timer). Set the timer logic so that it is initiated by
the breaker position input, and set the timer for two cycles pickup and two cycles dropout. Then AND the
timer output with the tripping output and OR it into the expression for the tripping output. The same can be
done for the closing output. Figure 8-21 illustrates the seal-in logic diagram.
Example 1.
Turn off the hold timer for output 1:
SG-HOLD1=0
SG-HOLD2=0
Set the timer logic:
SL-62=1,IN1,1,0
Set the pickup and dropout times:
S#-62=2c,2c
Set the output logic:
VO1=101T+BFPU+VO11+VO6
VO2=101C+79C+VO7
VO6=VO1*/162
VO7=VO2*62
NOTE
The following example is based on the FDR-W-IL logic scheme.
