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ENTER
CANCEL
NOTE: All settings and configuration of LEDs, BI and BO can be accessed and set by the user using these keys.
Alternatively configuration/settings files can be loaded into the relay using 'Reydisp'.
Config>Setting Dependencies is ENABLED, only the functions that are enabled will appear in the menu
structure.
'PROTECTION HEALTHY' LED
This green LED is steadily illuminated to indicate that DC 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 this LED will
continuously flash.
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 withdrawing the relay and 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 user programmed as hand or self–resetting. Hand reset LEDs can be reset by either 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
d.c. supply voltage.
2.6
C
I
URRENT
NPUTS
Current input terminals are available for both 1A and 5A inputs.
Current is sampled at 32 samples per cycle (1600Hz for 50Hz and 1920Hz for 60Hz systems). 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 32 samples per cycle.
The appropriate CT ratios are set in the CT/VT CONFIG menu.
2.7
V
I
OLTAGE
NPUTS
The voltage inputs can be defined with a nominal rating between 40 – 160V.
Voltage is sampled at 32 samples per cycle (1600Hz for 50Hz and 1920Hz for 60Hz systems). Protection and
monitoring functions of the relay use fundamental frequency voltage measurement.
The waveform recorder samples and displays voltage input waveforms at 32 samples per cycle.
The appropriate VT connection and ratio is set in the CT/VT CONFIG menu.
©2014 Siemens Protection Devices Limited
Used to initiate and accept settings changes.
Used to cancel settings changes and/or move up the menu structure by one
level per press.
Chapter 1) 7SR17 Rho Description Of Operation
When the System
Page 17 of 78
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