3.48
SEL-551 Relay Instruction Manual Date Code 20110408
Relay Elements and Logic
Front-Panel Target LEDs
Target Reset/Lamp
Test Front-Panel
Pushbutton
When the Target Reset/Lamp Test front-panel pushbutton is pressed:
➤ all front-panel LEDs are illuminated for one (1) second
➤ and then the Fault Type target LEDs (INST, A, B, C, and N) are
extinguished
Other Applications for the Target Reset Function
Refer to the bottom of Figure 3.13. The combination of the {TARGET RESET}
pushbutton and the TAR R (Target Reset) serial port command is available as
Relay Word bit TRGTR. Relay Word bit TRGTR pulses to logical 1 for one
processing interval when the TAR R (Target Reset) serial port command is
executed (the TAR R serial port command can also be effectively operated via
Modbus protocol, too—see Appendix G: Modbus RTU Communications
Protocol). Relay Word bit TRGTR asserts to logical 1 for as long as the
{TARGET RESET} pushbutton is pressed.
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