GE 850 Instruction Manual page 106

FRONT CONTROL PANEL INTERFACE
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This LED indicates that the element selected to produce a trip has operated. This
indicator always latches; as such, a Reset command must be initiated to allow the
latch to be reset.
• ALARM
This LED indicates that the FlexLogic™ operand serving as an Alarm switch has
operated. Latching of the indicator depends on the selected protection function. A
Reset command must be initiated to allow the latch to be reset.
• PICKUP
This LED indicates that at least one element is picked up. This indicator is never
latched.
• TEST MODE
This LED indicates that the relay has been set into Test Mode.
• MESSAGE
This LED indicates the presence of Target Messages detected by the relay.
• LOCAL MODE
This LED indicates that the relay is operating in local mode.
Breaker status indication is based on the breaker's 52a and 52b contacts. With both
contacts wired to the relay and configured, closed breaker status is determined by closed
52a contact and opened 52b contact. Vice-versa the open breaker status is determined by
opened 52a contact and closed 52b contact. If both 52a and 52b contacts are open, due to
a breaker being racked out from the switchgear, both the Breaker Open and Breaker
Closed LED Indicators will be off.
The Event Cause indicators in the first column are described as follows:
Events Cause LEDs are turned ON or OFF by protection elements that have their respective
target settings selected as either "Self-Reset" or "Latched". If a protection element target
setting is "Self-Reset", then the corresponding Event Cause LEDs remain ON as long as the
operate operand associated with the element remains asserted. If a 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 will remain ON until the
RESET button on the front panel is pressed after the operand is reset.
Default labels are shipped in the package of every 850, together with custom templates. A
custom LED template is available for editing and printing, refer to publication GET-20035
from http://www.gegridsolutions.com/multilin. The default labels can be replaced by user-
printed labels. Customization of LED operation is of maximum benefit in installations where
languages other than English are used to communicate with operators.
For LED and Pushbutton programming details, please refer to Front
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 3: INTERFACES
Panel.