Schweitzer Engineering Laboratories SEL-749M - Table 8.3 Possible Warning Conditions (Flashing TRIP LED)

8.10
SEL-749M Relay Instruction Manual Date Code 20080918
Front-Panel Operations
Operation and Target LEDs
The SEL-749M features slide-in labels for custom LED designations that
match custom LED logic. Use the slide-in labels to mark the LEDs with these
custom names. Included on the SEL-749M Product Literature CD are
Customer Label Templates to print labels for the slide-in label carrier.
The ENABLED LED indicates that the relay is powered correctly, is functional,
and has no self-test failures. Trip events illuminate the TRIP LED. The
prominent location of the TRIP LED in the top target area aids in recognizing
trip events quickly.
The TRIP LED has an additional function that notifies you of warning
conditions. When the TRIP LED is flashing, the warning conditions in
Table 8.3 are active when you set the corresponding relay element. For Relay
Word bit definitions see Appendix G.
TARGET RESET
Pushbutton
TARGET RESET
For a trip event, the SEL-749M latches the trip-involved target LEDs except
for the ENABLED LED. Press the {TARGET RESET} pushbutton to reset the latched
target LEDs. When a new trip event occurs and the previously latched trip
targets have not been reset, the relay clears the latched targets and displays the
new trip targets. Pressing and holding the {TARGET RESET} pushbutton
illuminates all the LEDs. Upon release of the {TARGET RESET} pushbutton, two
possible trip situations can exist: the conditions that caused the relay to trip
have cleared, or the trip conditions remain present at the relay inputs. If the
trip conditions have cleared, the latched target LEDs turn off. If the trip event
conditions remain, the relay re-illuminates the corresponding target LEDs.
The {TARGET RESET} pushbutton also removes the trip automatic message
displayed on the LCD menu screens if the trip conditions have cleared.
Table 8.3 Possible Warning Conditions (Flashing TRIP LED)
Relay Word Bits
27P2T BRGALRM
37PA COMMIDLE
46UBA COMMLOSS
49A JAMALRM
50G2T LOSSALRM
50N2T OTHALRM
50P2T PTCFLT
55A RTDFLT
59P2T SPDSAL
81D1A VARA
81D2A WDGALRM
AMBALRM
Courtesy of NationalSwitchgear.com