Maintain and Troubleshoot Relay 12-5
SEL-300G Instruction Manual Date Code 20000616
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 (i.e.,
XMODEM/CRC), and transfer files (e.g., send and receive binary files).
1. If the relay is in service, open its trip and close circuits.
2. Connect the personal computer to the relay Serial Port 2 or 3 and enter Access Level 2.
3. If you do not already have copies of the Relay, Global, Port, and SER settings, issue the
following commands to retrieve the settings: SHO 1, SHO 2, SHO G, SHO P 1,
SHO P 2, SHO P 3, SHO P F, and SHO R.
Normally, the relay will preserve the settings during the firmware upgrade. However, if the
new firmware version includes more settings than the old version, you will have to reenter
your old settings.
4. Set up your communication connection to the highest possible baud rate. The relay will
support speeds up to 38400 baud. Use the SET P command to change the SPEED
setting to the desired baud rate.
5. Issue the L_D <ENTER> command to the relay (L underscore D ENTER).
6. Type Y <ENTER> to the “Disable relay to send or receive firmware(Y/N)?” prompt
and Y <ENTER> to the
“Are you sure (Y/N)?” prompt. The relay will send the
SEL
BOOT prompt !>.
7. Make a copy of the firmware currently in the relay. This is recommended in case the
new firmware download is unsuccessful. To make a backup of the firmware, you will
need approximately 2.3 MB of free disk space. The procedure takes approximately 10
minutes at 38400 baud.
Issue the SEN <ENTER> command to initiate the firmware transfer. Select the binary
XMODEM transfer and filename in your communications software. Give the file a unique
name to clearly identify the firmware version (e.g., 300GR100.S19). After the transfer, the
relay will respond: “Download completed successfully!”
8. Transfer the new firmware to the relay. Issue the REC <ENTER> command to instruct
the relay to receive new firmware.
9. Type Y to erase the existing firmware or just <ENTER> to abort.
10. The relay then prompts you to press a key and begin the transfer. Press a key (e.g.,
<ENTER>).
11. Start the file transfer by selecting the send file option in your communication software.
Use the XMODEM protocol and send the file that contains the new firmware (e.g.,
300GR101.S19).
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