Schweitzer Engineering Laboratories SEL-751 - Table 7.27 LDP Commands; Table 7.28 L_D Command (Load Firmware)

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SEL-751 Relay Instruction Manual Date Code 20170927
Communications
Communications Protocols
If an IRIG-B signal is present, the relay synchronizes its internal clock with
IRIG-B. It is not necessary to issue the IRIG command to synchronize the
relay clock with IRIG-B. Use the IRIG command to determine if the relay is
properly reading the IRIG-B signal.
LDP Command (Load Profile Report)
Use the LDP commands (see Table 7.27) to view and manage the Load Profile
report (see Figure 5.14). If there is no stored data and an LDP command is
issued, the relay responds with
No data available.
L_D Command (Load Firmware)
Use the L_D command (see Table 7.28) to load firmware. See Appendix A:
Firmware, ICD, and Manual Versions for information on changes to the
firmware and instruction manual. See Appendix B: Firmware Upgrade
Instructions for further details on downloading firmware. Only download firmware
to the front port.
LOG HIF (High-Impedance Fault) Command
When the SEL-751 is ordered with the Arc Sense technology (AST) option for
the high-impedance fault detection, the relay provides high-impedance fault
detection progress data with the LOG HIF (LOG H command) report.
The LOG HIF command displays the progress of HIF detection in percentage
of their final pickup, the update of each entry is adaptive based on HIF
detection outputs. This command is available only when enable setting EHIF
is set to Y and Relay Word bit ITUNE_x (where x is A,B, or C) is deasserted
(tuning process has been completed).
Table 7.27 LDP Commands
Command Description Access Level
LDP row1 row2
LDP date1 date2
Displays a numeric progression of all load profile report rows. Use the LDP command with
parameters to display a numeric or reverse numeric subset of the load profile rows.
1
LDP C Clears the load profile report from nonvolatile memory. 1
Parameters
row1 row2 Append row1 to return a chronological progression of the first row1 rows. Append row1 and row2 to return all
rows between row1 and row2, beginning with row1 and ending with row2. Enter the smaller number first to dis-
play a numeric progression of rows through the report. Enter the larger number first to display a reverse numeric
progression of rows.
date1 date2 Append date1 to return all rows with this date. Append date1 and date2 to return all rows between date1 and
date beginning with date1 and ending with date2. Enter the oldest date first to display a chronological progres-
sion through the report. Enter the newest date first to display a reverse chronological progression. Date entries
are dependent on the date format setting DATE_F.
Table 7.28 L_D Command (Load Firmware)
Command Description Access Level
L_D Downloads firmware to the control. 2