GE L90 Instruction Manual page 422

5.7 CONTROL ELEMENTS
SETTI G
POTT SCHEME
FUNCTION:
Disabled = 0
Enabled = 1
AND
SETTI G
POTT SCHEME BLOCK:
OFF = 0
AND
FLEXLOGIC OPERA DS
PH DIST Z2 PKP
OR
GND DIST Z2 PKP
SETTI G
GND DIR O/C FWD:
AND
Off = 0
SETTI GS
POTT NO OF COMM
BITS:
POTT RX1:
AND
Off = 0
POTT RX2:
Off = 0
POTT RX3: OR
Off = 0
POTT RX4:
Off = 0
SETTI G
POTT PERMISSIVE ECHO:
5
Disabled
Off
FLEXLOGIC OPERA D
Enabled
LINE PICKUP LEO PKP
SETTI G
POTT ECHO COND:
Custom
Off = 0
5-292
AND
SETTI GS
POTT RX PICKUP
DELAY: AND
t
PKP
0
SETTI GS
TRANS BLOCK PICKUP
AND
DELAY:
TRANS BLOCK RESET
DELAY:
t
PKP
t
OR
RST
SETTI GS
LINE END OPEN PICKUP
DELAY:
t
PKP
0
Figure 5–158: POTT SCHEME LOGIC
L90 Line Current Differential System
SETTI GS
POTT SEAL-IN
DELAY:
0
OR
t
RST
Phase
Selector
FLEXLOGIC OPERANDS
AR FORCE 3P TRIP
OPEN POLE OP
FLEXLOGIC OPERANDS
0
100 msec
AR FORCE 3P TRIP
OPEN POLE OP
Phase
Selector
SETTI GS
AND
ECHO DURATION:
AND
ECHO LOCKOUT:
Echo duration and lockout logic
Phase
Selector
FLEXLOGIC OPERANDS
AR FORCE 3P TRIP
OPEN POLE OP
5 SETTINGS
FLEXLOGIC OPERA D
POTT OP
POTT NO OF COMM
BITS:
RUN
FLEXLOGIC OPERA DS
POTT TRIP A
TRIP TABLE
POTT TRIP B
RX
POTT TRIP C
POTT TRIP 3P
POTT NO OF COMM
BITS:
RUN
TRANSMIT TABLE
FLEXLOGIC OPERA DS
POTT TX1
RUN POTT TX2
POTT TX3
POTT TX4
RX
ECHO TABLE
GE Multilin
837014AH.C