4.187
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Global Settings (SET G Command)
Data Reset
The RSTTRGT setting resets the trip output and front-panel TRIP LED, pro-
vided there is no trip condition present. See Figure 4.79 for more details. The
RSTENRGY and RSTMXMN settings reset the Energy and Max/Min Meter-
ing values respectively. You should assign a contact input (for example, RST-
TRGT := IN401) to each of these settings if you want remote reset. The RSTDEM
and RSTPKDEM settings reset demand and peak-demand. See Figure 4.90
for the demand current logic diagram.
Access Control
The DSABLSET setting defines conditions for disabling all setting changes
from the front-panel interface. To disable setting changes from the front-panel
interface, assign a contact input (e.g., DSABLSET := IN402) to the
DSABLSET setting. When Relay Word bit DSABLSET asserts, you can view
the device settings from the front-panel interface, but you can only change set-
tings through use of the serial port commands. Tab le 4.81 shows the prompt,
range, and factory-default name for this setting.
Time Synchronization
Source
The SEL-751 accepts a demodulated IRIG-B time signal. Table 4.82 shows
the setting to identify the input for the signal. Set TIME_SRC := IRIG1 when
you use relay terminals B01/B02 or EIA-232 serial Port 3 for the time signal
input. When you use fiber-optic Port 2 for the signal, set the
TIME_SRC := IRIG2. Refer to IRIG-B Time-Code Input on page 2.23 and
IRIG-B on page 7.6 for additional information.
Table 4.79 Slot C Input Debounce Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Default
IN301 Debounce AC, 0–65000 ms IN301D := 10
IN302 Debounce AC, 0–65000 ms IN302D := 10
IN303 Debounce AC, 0–65000 ms IN303D := 10
IN304 Debounce AC, 0–65000 ms IN304D := 10
IN305 Debounce AC, 0–65000 ms IN305D := 10
IN306 Debounce AC, 0–65000 ms IN306D := 10
IN307 Debounce AC, 0–65000 ms IN307D := 10
IN308 Debounce AC, 0–65000 ms IN308D := 10
Table 4.80 Data Reset Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Defa ult
RESET TARGETS SELOGIC RSTTRGT := 0
RESET ENERGY SEL
OGIC RSTENRGY := 0
RESET MAX/MIN SEL
OGIC RSTMXMN := 0
RESET DEMAND SEL
OGIC RSTDEM := 0
RESET PK DEMAND SEL
OGIC RSTPKDEM := 0
NOTE: You cannot use the high-
speed outputs selected by
AOUTSLOT setting being Form A in
fail safe mode, so these should be
disabled (set OUTxxxFS := N).
Table 4.81 Setting Change Disable Setting
Setting Prompt Setting Range
Setting Name :=
Facto ry De fault
DISABLE SETTINGS SELOGIC DSABLSET := 0
NOTE: DSABLSET does not disable
the setting changes from the serial
ports.
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