GE t60 Instruction Manual page 177

5 SETTINGS
A dedicated FlexLogic™ operand,
tiated, the
LED TEST INITIATED
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:
Configure the LED test to recognize user-programmable pushbutton 1 by making the following entries in the
PRODUCT SETUP USER-PROGRAMMABLE LEDS
"Enabled"
LED TEST FUNCTION:
"
LED TEST CONTROL: PUSHBUTTON 1 ON
The test will be initiated when the user-programmable pushbutton 1 is pressed. The pushbutton should remain pressed for
as long as the LEDs are being visually inspected. When finished, the pushbutton should be released. The relay will then
automatically start stage 2. At this point forward, test may be aborted by pressing the pushbutton.
APPLICATION EXAMPLE 2:
Assume one needs to check if any LEDs are "burned" as well as exercise one LED at a time to check for other failures. This
is to be performed via user-programmable pushbutton 1.
GE Multilin
, is set for the duration of the test. When the test sequence is ini-
LED TEST IN PROGRESS
event is stored in the event recorder.
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 5–4: LED TEST SEQUENCE
"Self-reset"
"0.10 s"
LED TEST
"
T60 Transformer Protection System
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
menu:
5.2 PRODUCT SETUP
set-
LED TEST CONTROL
5
SETTINGS
SETTINGS
5-45