Date Code 20100129 Instruction Manual SEL-751A Relay
Appendix B
Firmware Upgrade Instructions
Overview
SEL occasionally offers firmware upgrades to improve the performance of
your relay. Because the SEL-751A Feeder Protection Relay stores firmware in
flash memory, changing physical components is not necessary. Upgrade the
relay firmware by downloading a file from a personal computer to the relay
via the front-panel serial port as outlined in the following sections.
Required Equipment
Gather the following equipment before starting this firmware upgrade:
➤ Personal computer (PC)
➤ Terminal emulation software that supports Xmodem/CRC or
1k Xmodem/CRC protocol
➤ Serial communications cable (SEL Cable C234A or equivalent,
or a null-modem cable)
➤ Disk containing the firmware upgrade file (e.g., r400751A.s19
or r400751A.z19)
Upgrade Instructions
The instructions below assume you have a working knowledge of your
personal computer terminal emulation software. In particular, you must be
able to modify your serial communications parameters (baud rate, data bits,
parity, etc.), select transfer protocol (Xmodem/CRC or 1k Xmodem/CRC),
and transfer files (e.g., send and receive binary files).
Step 1. If the relay is in service, open the relay control circuits.
Step 2. Connect the PC to the front-panel serial port and enter Access
Level 2.
Step 3. Save the current relay settings.
PC software (described in Section 3: PC Software) can be used
to save and restore settings easily. Otherwise, use the following
steps.
a. Issue the following commands at the ASCII prompt:
SHO, SHO L, SHO G, SHO P, SHO F, SHO R, etc.
b. Record all the settings for possible re-entry after the
firmware upgrade.
NOTE: More recent firmware
releases are also available as zip files
(.z19). Use the zip file for faster
download.
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