Date Code 20001006 Firmware Upgrade Instructions B-1
SEL-351 Instruction Manual
APPENDIX B: FIRMWARE UPGRADE INSTRUCTIONS
FIRMWARE (FLASH) UPGRADE INSTRUCTIONS
SEL may occasionally offer firmware upgrades to improve the performance of your relay. The
SEL-351 Relay stores firmware in Flash memory; therefore, changing physical components is not
necessary. A firmware loader program called SELBOOT resides in the SEL-351 Relay. These
instructions give a step-by-step procedure to upgrade the relay firmware by downloading a file
from a personal computer to the relay via a serial port.
IMPORTANT NOTE REGARDING SETTINGS
The firmware Upgrade Procedure may result in lost relay settings due to the addition of new
features and changes in the way memory is used. It is imperative to have a copy of the original
relay settings available in case they need to be re-entered. Carefully following these upgrade
instructions will minimize the chance of inadvertently losing relay settings.
REQUIRED EQUIPMENT
• Personal computer.
• Terminal emulation software that supports XMODEM/CRC protocol (e.g., CROSSTALK
®
,
Microsoft
®
Windows
®
Terminal and HyperTerminal, Procomm Plus
®
, Relay/Gold, and
SmartCOM).
• Serial communications cable (SEL-234A or equivalent).
• Disk containing firmware upgrade file.
UPGRADE PROCEDURE
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.), disable any hardware or software flow control in
your computer terminal emulation software, select transfer protocol (i.e., XMODEM/CRC), and
transfer files (e.g., send and receive binary files).
1. If the relay is in service, disable its control functions.
Note: If the SEL-351 Relay contains History (HIS) data, Event (EVE) data, Metering
(MET) data, Sequential Events Recorder (SER) data, Load Profile (LDP) data,
Sag/Swell/Interruption (SSI) reports, or Breaker Wear Monitor (BRE) data that you want
to retain, it must be retrieved prior to performing the firmware upgrade, because all of
these data sets may be erased in the upgrade procedure.
2. Connect the personal computer to the relay serial port 2, 3, or F, and enter Access Level 2
by issuing the ACC and 2AC commands. (Disconnect any other serial port connections.)
Courtesy of NationalSwitchgear.com
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