CHAPTER 4: INTERFACES
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 4–3
• HOT STATOR: Indicates that the generator stator is above normal temperature when
one of the stator RTD alarm or trip elements is picked up or the thermal model trip
element is picked up.
• NEG. SEQUENCE: Indicates that the negative sequence current alarm or trip element
is picked up.
• GROUND: Indicates that at least one of the ground overcurrent, neutral overvoltage
(fundamental), or neutral undervoltage (3rd harmonic) alarm/trip elements is picked
up.
• LOSS OF FIELD: Indicates that at least one of the reactive power (kvar) or field-breaker
discrepancy alarm/trip elements is picked up.
• VT FAILURE: Indicates that the VT fuse failure alarm is picked up.
• BREAKER FAILURE: Indicates that the breaker failure or trip coil monitor alarm is
picked up.
Output Status LED Indicators
• 1 TRIP: The 1 Trip relay has operated (energized).
• 2 AUXILIARY: The 2 Auxiliary relay has operated (energized).
• 3 AUXILIARY: The 3 Auxiliary relay has operated (energized).
• 4 AUXILIARY: The 4 Auxiliary relay has operated (energized).
• 5 ALARM: The 5 Alarm relay has operated (energized).
• 6 SERVICE: The 6 Service relay has operated (de-energized, 6 Service is fail-safe,
normally energized).
4.1.3 RS232 Program Port
This port is intended for connection to a portable PC. Setpoint files may be created at any
location and downloaded through this port with the EnerVista 489 Setup software. Local
interrogation of setpoint and actual values is also possible. New firmware may be
downloaded to the 489 flash memory through this port. Upgrading the relay firmware
does not require a hardware EEPROM change.
4.1.4 Keypad
Description
The 489 display messages are organized into main menus, pages, and sub-pages. There
are three main menus labeled Setpoints, Actual Values, and Target Messages.
Z Press the
MENU key followed by the MESSAGE T key to scroll through
the three main menu headers, which appear in sequence as follows:
SETPOINTS [w]
Courtesy of NationalSwitchgear.com
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