GE L60 Instruction Manual page 137

5 SETTINGS
Stage 2: All the LEDs are turned off, and then one LED at a time turns on for 1 second, then back off. The test routine
starts at the top left panel, moving from the top to bottom of each LED column. This test checks for hardware failures
that lead to more than one LED being turned on from a single logic point. This stage can be interrupted at any time.
Stage 3: All the LEDs are turned on. One LED at a time turns off for 1 second, then back on. The test routine starts at
the top left panel moving from top to bottom of each column of the LEDs. This test checks for hardware failures that
lead to more than one LED being turned off from a single logic point. This stage can be interrupted at any time.
When testing is in progress, the LEDs are controlled by the test sequence, rather than the protection, control, and monitor-
ing 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 will not clear any targets when the LED Test is in progress.
A dedicated FlexLogic™ operand,
tiated, 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
ting. 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. The following set-
tings should be applied. Configure User-Programmable Pushbutton 1 by making the following entries in the
PRODUCT SETUP USER-PROGRAMMABLE PUSHBUTTONS
PUSHBUTTON 1 FUNCTION:
PUSHBTN 1 DROP-OUT TIME:
GE Multilin
, is set for the duration of the test. When the test sequence is ini-
LED TEST IN PROGRESS
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)
Figure 5–2: LED TEST SEQUENCE
"Self-reset"
"0.10 s"
L60 Line Phase Comparison Relay
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
menu:
USER PUSHBUTTON 1
5.2 PRODUCT SETUP
5
set-
LED TEST CONTROL
SETTINGS
5-35