Sel SEL-787 - Figure 8.24 Target Reset Pushbutton; Table 8.3 Possible Warning Conditions (Flashing TRIP LED)

8.13
Date Code 20150130 Instruction Manual SEL-787 Relay
Front-Panel Operations
Operation and Target LEDs
the TARGET RESET pushbutton or the TAR R command as long as the target
conditions are absent. For a concise listing of the default programming on the
front-panel LEDs, see Table 4.60.
The SEL-787 comes with blank slide-in labels for custom LED designations
that match custom LED logic. The Configurable Label Kit (includes blank
labels, word processor templates, and instructions) is shipped with the
SEL-787.
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. When the TRIP LED is lit continuously, the TRIP TYPE is
displayed on the LCD display. Refer to Table 9.1, for the list of possible trip
messages.
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 J: Relay Word Bits.
TARGET RESET
Pushbutton
Target Reset
For a trip event, the SEL-787 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.
Figure 8.24 Target Reset Pushbutton
Table 8.3 Possible Warning Conditions (Flashing TRIP LED)
HMI Message Condition (Relay Word Bit)
RTD Warning AMBALRM OR OTHALRM
RTD Failure RTDFLT
Comm. Loss Warning COMMLOSS
Comm. Idle Warning COMMIDLE