Liquid Crystal Display (Lcd); Figure 2-2 Safety Symbols; Figure 2-3 Relay Lcd - Siemens 7SR45 Argus User Manual

For safety reasons, the following symbols are displayed on the label.
7SR45 self powered overcurrent and earth fault relay consist of the following human machine interface HMI):
1. LCD
2. Keypads
3. LED
2.1.1

Liquid Crystal Display (LCD)

7SR45 self powered overcurrent and earth fault relay consists of 16x2 LCD that indicates the settings,
instrumentation, and fault data.
By using the LCD, the user can view or edit a configuration parameter. LCD allows the user to view the real time
status of relay such as BI, BO, primary, and secondary current values of each phase and earth.
LCD displays the stored fault information to the user. When any fault condition occurs, the relay displays the latest
fault information in LCD.
The backlight TURNS ON automatically if the 7SR45 self powered overcurrent and earth fault relay is powered on
with CT power and the current is more than 0.4In (single phase) or 0.14In (three phase). If the 7SR45 self
powered overcurrent and earth fault relay is energized with current less than the defined limits, the backlight does
not TURN ON.
If the 7SR45 self powered overcurrent and earth fault relay is powered on by inserting a USB cable or by inserting
a battery, the backlight TURNS ON automatically.
The backlight can be turned off manually by pressing the backlight key. If no activity is performed in the HMI for
more than 30 s, the backlight TURNS OFF automatically to save energy.
In the CT power mode, 7SR45 self powered overcurrent and earth fault relay periodically monitors that sufficient
current is available to TURN ON the back light.
In the USB or battery power mode, if the back light is already turned on and if the CT power source is provided,
the back light TURNS OFF due to the switching of power mode from USB or Battery to CT power. The back light
can be TURNED ON again if sufficient current is available.
For more information about power source, refer to
© 2017 Siemens Protection Devices Limited
Figure 2-2 Safety Symbols
Modes of Operation.
Figure 2-3 Relay LCD
7SR45 Description of Operation
Chapter 1 Page 11 of 34