GE D30 Instruction Manual page 223

CHAPTER 5: SETTINGS
When testing is in progress, the LEDs are controlled by the test sequence, rather than the protection, control, and
monitoring features. However, the LED control mechanism accepts all the changes to LED states generated by the relay
and stores the actual LED states (on or off) in memory. When the test completes, the LEDs reflect the actual state resulting
from relay response during testing. The reset pushbutton does not clear any targets when the LED Test is in progress.
A dedicated FlexLogic operand,
the LED TEST INITIATED event is stored in the event recorder.
The entire test procedure is user-controlled. In particular, stage 1 can last as long as necessary, and stages 2 and 3 can be
interrupted. The test responds to the position and rising edges of the control input defined by the
setting. The control pulses must last at least 250 ms to take effect. The following diagram explains how the test is
executed.
Application example 1
Assume one needs to check if any of the LEDs is "burned" through user-programmable pushbutton 1. Apply the following
settings.
Configure user-programmable pushbutton 1 by making the following entries in the
PROGRAMMABLE PUSHBUTTONS  USER PUSHBUTTON 1
PUSHBUTTON 1 FUNCTION
PUSHBTN 1 DROP-OUT TIME
Configure the LED test to recognize user-programmable pushbutton 1 by making the following entries in the
PRODUCT SETUP  USER-PROGRAMMABLE LEDS  LED TEST
: "Enabled"
LED TEST FUNCTION
: "
LED TEST CONTROL
PUSHBUTTON 1 ON
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PROGRESS, is set for the duration of the test. When the test sequence is initiated,
LED TEST IN
Figure 5-32: LED test sequence
READY TO TEST
rising edge of the
control input
Start the software image of
the LEDs
Set the
LED TEST IN PROGRESS
operand
control input is on
STAGE 1
(all LEDs on)
dropping edge of the
control input
Wait 1 second
STAGE 2
(one LED on at a time)
Wait 1 second
STAGE 3
(one LED off at a time)
menu. (The option does not display when not purchased.)
: "Self-reset"
: "0.10 s"
"
Reset the
LED TEST IN PROGRESS
operand
Restore the LED states
from the software image
time-out
(1 minute)
rising edge of the
control input
rising edge of the
control input
rising edge of the
control input
rising edge
of the control
input
842011A1.CDR
SETTINGS  PRODUCT SETUP  USER-
menu:
PRODUCT SETUP
LED TEST CONTROL
SETTINGS 
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