Figure 1.47: Hot Line Tag Logic; Figure 1.48: Example Aux 1 Operator Control Application (Local Control Of Hot Line Tag) - Schweitzer Engineering Laboratories SEL-351R Instruction Manual

Figure 1.47: Hot Line Tag Logic

Figure 1.48 shows modified hot line tag logic, where the hot line tag can be set/reset in either of
two ways:
• Locally (with the AUX 1 operator control pushbutton output)
• Remotely (with input IN102 wired to a SCADA contact)
Note that the LOCK operator control logic supervises the AUX 1 operator control. The LOCK
operator control has to be OFF (LT4 = logical 1) in order for the AUX 1 operator control to
effectively function, and so that Relay Word bit PB6 can propagate on to latch LT7.
The corresponding AUX 1 LED (SEL
front-panel HOT LINE TAG LED (SEL
displays the status of the hot line tag—not of a latch reserved specifically for the AUX 1 operator
control.
Input IN102 is not supervised in this example. A SCADA contact pulses input IN102 to set/reset
hot line tag remotely.
Relay
AUX 1 operator
Word
control
Bits
pushbutton
PB6
(pulsed output - see
Figure 1.37)
LOCK operator
control OFF
(see Figure 1.50)
LT4
input IN102 pulsed
by SCADA contact
IN102
to enable/disable a
hot line tag

Figure 1.48: Example AUX 1 Operator Control Application (local control of hot line tag)

Date Code 20020215
SET7
1
(set)
SEL settings
OGIC
RST7
0
(reset)
DWG: M351R070
OGIC
OGIC
Local
Remote
rising
edge
detect
Factory-Set Logic
SEL-351R Instruction Manual
Relay HOT LINE
Word TAG LED
Bit setting
LT7
LED13 = !LT7
(always extinguished)
Hot line tag OFF
(LT7 = logical 1)
LT7 is used in the CL
(close conditions other
than auto-reclose), ULCL
(unlatch close), and
79DTL (drive-to-lockout)
SEL settings. (See
OGIC
Figures 1.20, 1.21, and
1.25.)
setting LED6 = !LT7) is programmed to follow the
setting LED13 = !LT7). Thus, the AUX 1 LED
SET7
(set)
SEL settings
OGIC
RST7
(reset)
= NOT (LT7)
= NOT (1)
= 0
Relay
Word
HOT LINE
Bit
TAG LED
setting
LT7
LED13 = !LT7
= NOT (LT7)
AUX1
operator
control
LED
setting
LED6 = !LT7
= NOT (LT7)
Hot line tag OFF (by
local or remote means;
LT7 = logical 1)
LT7 is used in the CL
(close conditions other
than auto-reclose), ULCL
(unlatch close), and
79DTL (drive-to-lockout)
SEL settings. (See
OGIC
Figures 1.20, 1.21, and
1.25.)
DWG: M351R072
1-51