5-18
Control Logic
Date Code 20010731
SEL-352-1, -2 Instruction Manual
LED T
ARGETING
L
OGIC
The target LEDs on the front panel illuminate based on various relay conditions. Under normal
operating conditions, the EN LED should be lit. Whenever another LED is illuminated, it
indicates that the relay has detected a particular condition since the last time the Target Reset
button was pushed, the
TAR R
command was issued, or power was cycled. View these targets
remotely by issuing the
TAR n
command to one of the serial ports, where n is a number
representing the row of the Relay Word to be displayed. Row 0 and Row 1 of the Relay Word
represent the 16 LEDs.
Front-panel targets are processed every 1/8 cycle and illuminate for the conditions shown in
Table 5.7. All target LEDs latch except EN, 52A, and MOD. TRIP and CLOSE will reset one
another. Targets are reset when power is cycled. Refer to Figure 5.8 through Figure 5.20 for
logic diagrams for each target LED.
Table 5.7: Target LED Illumination Conditions
Target LED
Conditions for Illumination
Latched
Row 0
(top row)
EN
Normal
Operation
No
PF
Breaker Pending Failure Detected
Yes
86BFT
Lockout Relay Trip
Yes
86RS
Lockout Relay Reset
Yes
TRIP
Breaker Trip Received
Yes*
CLOSE
Breaker Close Received
Yes*
52A
52A Status Input Assertion
No
MOD
MOD Status Input Assertion
No
Row 1
(bottom row)
A
A-Phase Breaker Failure
Yes
B
B-Phase Breaker Failure
Yes
C
C-Phase Breaker Failure
Yes
FAULT
Fault Current Protection Operated
Yes
LOAD
Load Current Protection Operated
Yes
UBAL
Current Unbalance Protection Operated
Yes
FLASH
Flashover Protection Operated
Yes
THERM
Thermal Failure Protection Operated
Yes
*TRIP and CLOSE Target LEDs reset one another.
EN Target LED
The enable (EN) target LED is illuminated for all normal operating conditions. Any condition
that temporarily or permanently disables the relay protection and control capabilities
extinguishes the EN target LED.
Содержание SEL-352-1
Страница 8: ......
Страница 10: ......
Страница 12: ......
Страница 30: ......
Страница 68: ......
Страница 186: ......
Страница 292: ......
Страница 300: ...9 8 Front Panel Interface Date Code 20010731 SEL 352 1 2 Instruction Manual Figure 9 3 Front Panel Operation Map ...
Страница 302: ......
Страница 368: ......
Страница 370: ......
Страница 374: ......
Страница 380: ......
Страница 382: ......
Страница 384: ......
Страница 386: ......
Страница 396: ......
Страница 404: ......
Страница 422: ......
Страница 442: ......