Siemens SIPROTEC 5 V7.80 Operation page 70

Using On-Site Operation Panel
5.2 Overview of Operator Elements and Display Elements
Operator Element/Display
Element
70
Function
Display of operability
Green LED (Run)
The device is switched on. The presence of the external auxiliary voltage is
indicated to you.
Red LED (Error)
The device is not ready to run or a failure is present. The life contact is
open. After successful start of the device, the LED goes out, indicating to
you that the device is ready for operation.
SIPROTEC 5, Operation, Manual
C53000-G5040-C003-9, Edition 06.2018