GE 745 - 4.1.2 Display; 4.1.3 LEDs; 4.1.4 LED Indicators

4–2 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
HARDWARE INTERFACE CHAPTER 4: INTERFACES
4.1.2 Display
All messages are displayed in English on the 40-character liquid crystal display, which is
backlit for visibility under varied lighting conditions. When the keypad and display are not
actively being used, the screen sequentially displays up to 30 user-selected default
messages providing system information. These messages appear after a time of inactivity
that is programmable by the user. Pressing any key after default messages have appeared
will return the display to the last message displayed before the default messages
appeared. Trip and alarm condition messages automatically override default messages. All
display pixels are illuminated briefly during power up self-testing, and can be energized by
pressing any key when no trips or alarms are active.
4.1.3 LEDs
Front panel indicators are grouped in three columns: Relay Status, which provides
information about the state of the 745; System Status, which provides information about
the state of the transformer and the power system; and Output Status, which provides
details about abnormal conditions that have been detected. The color of each indicator
conveys information about its importance:
GREEN (G): indicates a general condition
AMBER (A): indicates an alert condition
RED (R): indicates a serious alarm or warning
4.1.4 LED Indicators
4.1.4.1 745 Status
• RELAY IN SERVICE: The In Service LED is on when relay protection is operational. The
indicator is on only if all of the following conditions are met:
–The
S1 745 SETUP  INSTALLATION  745 SETPOINTS setpoint is set to
“Programmed”.
–The
S6 TESTING  OUTPUT RELAYS  FORCE OUTPUT RELAYS FUNCTION setpoint is
set to “Disabled”.
–The
S6 TESTING  SIMULATION  SIMULATION SETUP  SIMULATION FUNCTION
setpoint is set to “Disabled”.
– No self-test errors which have an effect on protection have been detected.
– Code programming mode is inactive.
– Factory service mode is disabled.
• SELF-TEST ERROR: The Self-Test Error LED is on when any of the self-diagnostic tests,
performed either at power-on or in the background during normal operation, has
detected a problem with the relay.
• TEST MODE: The Test Mode LED indicator is on when any of the 745 testing features
has been enabled. The indicator is on if any of the following conditions are met:
–The
S6 TESTING  OUTPUT RELAYS  FORCE OUTPUT RELAYS FUNCTION setpoint is
set to “Enabled”.
–The
S6 TESTING  ANALOG OUTPUTS  FORCE ANALOG OUTPUTS FUNCTION
setpoint is “Enabled”.