Protection Healthy Led; Indication Leds; Current Inputs; Figure 2-7 Led Indication Label - Siemens 7SR10 Argus Series Manual

7SR10 Description of Operation

2.7.4 Protection Healthy LED

This green LED is steadily illuminated to indicate that auxiliary voltage has been applied to the relay power supply
and that the relay is operating correctly. If the internal relay watchdog detects an internal fault then the LED will
continuously flash.

2.7.5 Indication LEDs

Relays have 9 user programmable LED indicators. Each LED can be programmed to be illuminated as either
green, yellow, or red. Where an LED is programmed to be lit both red and green, it will illuminate yellow. The
same LED can be assigned two different colours dependent upon whether a Start/Pickup or Operate condition
exists. LED's can be assigned to the pickup condition and colour selected in the OUTPUT CONFIG > LED
CONFIG menu.
Functions are assigned to the LEDs in the OUTPUT CONFIG > OUTPUT MATRIX menu.
Each LED can be labelled by inserting a label strip into the pocket behind the front fascia. A 'template' is available
in the Reydisp software tool to allow users to create and print customised legends.
Each LED can be programmed as hand reset or self reset. Hand reset LEDs can be reset either by pressing the
TEST/RESET ► button, energising a suitably programmed binary input or by sending an appropriate command
over the data communications channel(s).
The status of hand reset LEDs is maintained by a back up storage capacitor in the event of an interruption to the
supply voltage.
Figure 2-7 LED Indication Label
2.8

Current Inputs

Four current inputs are provided on the Analogue Input module. Terminals are available for both 1 A and 5 A
inputs.
The current input is incorporated within the relay and is used for phase fault and earth fault protection.
Current is sampled at 1600 Hz for both 50 Hz and 60 Hz system frequencies. Protection and monitoring functions
of the relay use either the Fundamental Frequency RMS or the True RMS value of current appropriate to the
individual function.
The waveform recorder samples and displays current input waveforms at 1600 Hz.
The primary CT ratio used for the relay instruments can be set in the CT/VT configuration menu.
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