Current Inputs; Voltage Inputs; Binary Inputs - Siemens 7SR224 Technical Manual

Standard Keys
The relay is supplied as standard with five navigation / control pushbuttons and 12 programmable function keys.
The navigation / control buttons are used to navigate the menu structure and control relay functions. They are
labelled:
▲
▼
TEST/RESET►
ENTER
CANCEL.
NOTE: All settings and configuration of LEDs, BI, BO and function keys can be accessed and set by the user
using these keys. Alternatively configuration/settings files can be loaded into the relay using 'Reydisp'.
Function Keys/ LEDs
The 12 programmable function keys can be configured by the user to initiate selected functions from the Control
menu (INPUT CONFIG > FUNCTION KEY MATRIX).
Each programmable function key has an associated LED. These can be programmed as hand or self reset and
can be illuminated as green, yellow or red (OUTPUT CONFIG > LED CONFIG).
Function keys can be used with Quick Logic.
2.6

Current Inputs

Four current inputs are provided on the Analogue Input module. Terminals are available for both 1A and 5A
inputs.
Current is sampled at 1600Hz for both 50Hz and 60Hz 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 32 samples per cycle (1600Hz).
2.7

Voltage Inputs

Four voltage inputs are provided on the Analogue Input module.
Voltage is sampled at 32 samples per cycle (1600Hz) both 50Hz and 60Hz system frequencies. 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 (1600Hz).
NB: The Relay has a flat frequency response measuring harmonic currents up to and including the 50th Harmonic
but does not measure the content at the aliasing frequencies i.e. 800 Hz (16
th
harmonic) + 2400 Hz (48 harmonic).
2.8

Binary Inputs

The binary inputs are operated from a suitably rated dc supply.
Relays are fitted with 13, 33 or 43 binary inputs (BI) depending on the variant. The user can assign any binary
input to any of the available functions (INPUT CONFIG > INPUT MATRIX).
The Power Supply module includes the relay basic I/O incorporating 3 x BI and 6 x BO.
©2010 Siemens Protection Devices Limited
Increases a setting or moves up menu.
Decreases a setting or moves down menu.
Moves right, can be used to reset selected functionality and for LED test (at
relay identifier screen).
Used to initiate and accept settings changes.
Used to cancel settings changes and/or move up the menu structure by one
level per press.
7SR224 Argus Description of Operation
th
harmonic) + 1600 Hz (32
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