GE L30 Instruction Manual page 167

CHAPTER 4: INTERFACES
protection element target setting is "Latched," then the corresponding event-cause LEDs turn on when the operate
operand associated with the element is asserted and remains on until the
the operand is reset.
All elements that are able to discriminate faulted phases can independently turn off or on the phase A, B, or C LEDs. This
includes phase instantaneous overcurrent, phase undervoltage, and so on. This means that the phase A, B, and C operate
operands for individual protection elements are ORed to turn on or off the phase A, B, or C LEDs.
• VOLTAGE — This LED indicates voltage was involved
• CURRENT — This LED indicates current was involved
• FREQUENCY — This LED indicates frequency was involved
• OTHER — This LED indicates a composite function was involvedThis LED indicates a composite function was involved
• PHASE A — This LED indicates phase A was involved
• PHASE B — This LED indicates phase B was involved
• PHASE C — This LED indicates phase C was involved
• NEUTRAL/GROUND — This LED indicates that neutral or ground was involved
The user-programmable LEDs consist of 48 amber LED indicators in four columns. The operation of these LEDs is user-
defined. Support for applying a customized label beside every LED is provided. Default labels are shipped in the label
package of every L30, together with custom templates. The default labels can be replaced by user-printed labels.
User customization of LED operation is of maximum benefit in installations where languages other than English are used
to communicate with operators. See the User-Programmable LEDs section in chapter 5 for the settings used to program
the operation of the LEDs on these panels.
4.2.4.2 Standard front panel
The standard front panel consists of three panels with LED indicators, keys, and a communications port. The
used to reset any latched LED indicator or target message, once the condition has been cleared (these latched conditions
can also be reset via the
SETTINGS  INPUT/OUTPUTS  RESETTING
computer.
The keys are used by the breaker control feature.
USER
Status indicators
• IN SERVICE — Indicates that control power is applied, all monitored inputs/outputs and internal systems are fine, and
the relay is in (online) Programmed mode (under Settings > Product Setup > Installation)
• TROUBLE — Indicates that the relay has detected an internal problem. Check the self-test messages outlined at the
end of the Commands and Targets chapter, and view the event records under Actual Values > Records. For a beta /
pre-release, this LED is always on.
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
RESET
menu). The RS232 port is for connection to a
Figure 4-48: LED panel 1
FRONT PANEL INTERFACE
button on the front panel is pressed after
RESET
4
key is
4-41