7SR105 Rho Description of Operation
©2018 Siemens Protection Devices Chapter 1 Page 11 of 57
2.2 Front Fascia
The front fascia is an integral part of the relay and allows the user to access all the push buttons and performs the
setting changes and control actions. The fascia provides an option to reset the fault data display, latched binary
outputs, and LEDs by using the TEST/RESET► button. The front fascia contains the label strip which provides
the information about LED indicators.
Front Fascia consists of CB control push buttons to open and close.
2.2.1 Front Fascia with Control Push Buttons
Figure 2-1 7SR105 Rho Motor Protection Relay with control push buttons
2.3 Start Motor/Stop Motor
The Motor control function is used to manually start and stop the motor when it is connected to the network. Two
dedicated push buttons are provided on the HMI to execute the motor manual start and stop operations.
Start
Press Start button and confirm ENTER to execute the start
operation of motor.
Stop Press Stop button and confirm ENTER to execute the stop
operation of motor.
The user can configure the binary input, binary output, and LED configuration for the motor start and stop control
functions.
To perform the motor start and stop control operations, follow the procedure given below:
1. Apply CB Close Binary Input (BI) to get the breaker status.
2. Press STOP MOTOR control key. The confirmation pop-up appears.
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