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Provides an overview of the 489 relay, its features, and general information.
Details technical specifications for the 489 relay, including power supply, inputs, and outputs.
Outlines the procedure for accessing and modifying setpoints via the front panel keypad.
Details the hardware and electrical interface, including RS485 and RS232 ports and Modbus protocol.
Provides information on the memory map structure, including register addresses and data formats.
Outlines the purpose of testing and lists the various tests to be performed on the 489 relay.
Provides information on installing, upgrading, and configuring the 489PC software and relay firmware.
Summarizes default and user-defined setpoints for the 489 relay across various pages.
Lists default and user values for 489 SETUP setpoints, including Passcode and Serial Ports.
Lists digital input setpoints for General Inputs A, B, C, and D, including their configurations.
Lists current element setpoints, covering Overcurrent Alarm, Offline Overcurrent, and Inadvertent Energization.
Lists voltage element setpoints including Undervoltage, Overvoltage, Volts/Hertz, and Underfrequency.
Lists thermal model setpoints for setup, overload curves, and RTD bias parameters.
Provides general concepts and guidelines for protecting generator stators against ground faults.
Describes the neutral overvoltage element for detecting stator ground faults.
Details the ground overcurrent element as a replacement or backup for neutral overvoltage.
Explains the ground directional element using Vneutral and ground current inputs for fault detection.
Covers the third harmonic voltage element for detecting stator ground faults near the generator neutral.
General
