U.6.45 Appendix A: Firmware and Manual Versions Firmware. U.5.40 Date Code SEL-421 RelayĤ ii Table of Contents Section 6: Testing and Troubleshooting Testing Philosophy. U.5.36 Front-Panel Operator Control Pushbuttons. U.4.79 Section 5: Front-Panel Operations Front-Panel Layout. U.4.71 Readying the Relay for Field Application. U.4.56 Configuring High-Accuracy Timekeeping. U.4.42 Operating the Relay Inputs and Outputs. U.4.33 Reading Oscillograms, Event Reports, and SER. U.3.21 Section 4: Basic Relay Operations Inspecting a New Relay. U.3.4 Settings Database Management and Drivers. U.2.50 Section 3: PC Software Installing the Computer Software. U.1.13 Section 2: Installation Shared Configuration Attributes. U.1.5 SEL-421 Versions and Supported Features. xxxi User s Guide Section 1: Introduction and Specifications Features. PM SEL-421 Relay Reference Manual Date Codeģ Table of Contents Table of Contents. For warranty details, visit or contact your customer service representative. This product is covered by the standard SEL 10-year warranty. has approved only the English language document. Schweitzer Engineering Laboratories, Inc. The information in this document is provided for informational use only and is subject to change without notice. reserves all rights and benefits afforded under federal and international copyright and patent laws in its products, including without limitation software, firmware, and documentation. SEL products appearing in this document may be covered by U.S. No SEL trademarks may be used without written permission. All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. 1 SEL-421 Relay Protection and Automation System Instruction Manual Reference Manual *PM NB*Ģ by Schweitzer Engineering Laboratories, Inc.
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