7SR105 Rho Description of Operation
©2018 Siemens Protection Devices Chapter 1 Page 15 of 57
Figure 2-6 Safety Symbols
2.7 Operator Interface
2.7.1 Liquid Crystal Display (LCD)
A 4 line by 20-character alpha-numeric liquid crystal display indicates settings, instrumentation, fault data, and
control commands.
To conserve power, the display backlighting is extinguished when no buttons are pressed for a user-defined
period. The ‘backlight timer’ setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1
to 60 minutes and “Off” (backlight permanently on). Pressing any key will reactivate the display.
User-defined identifying text can be programmed into the relay by using the System config/Relay Identifier and
System config/Circuit Identifier setting. The ‘Identifier’ texts are displayed on the LCD display in two lines at the
top level of the menu structure. The ‘Relay Identifier’ is used in communication with Reydisp to identify the relay.
By pressing the Cancel button several times will return the user to this screen.
Figure 2-7 Close up of Relay Identifier
2.7.2 LCD Indication
General Alarms are user defined text messages displayed on the LCD when mapped to binary inputs or virtual
inputs. Up to six general alarms of 16 characters can be programmed, each triggered from one or more input.
Each general alarm will also generate an event.
If multiple alarms are activated simultaneously, the messages are displayed on a separate page in a
rolling display on the LCD. The System Config > General Alarm Alert setting Enabled/Disabled allows the user
to select if the alarms are to be displayed on the LCD when active.
All general alarms are raised when a fault trigger is generated and will be logged into the Fault Data record.
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