Front Cover; Power Supply Unit (Psu); Operator Interface/ Fascia; Figure 2.5-1 7Sr21 With 3 + 8 Leds In E6 Case - Siemens 7SR21 Manual

Hide thumbs Also See for 7SR21:

Table of Contents

2.3

Front Cover

With the transparent front cover in place the user only has access to the ▼ and TEST/RESET► buttons, via blue

push buttons, allowing all areas of the menu system to be viewed, but preventing setting changes and control

actions. The only 'action' that is permitted is to reset the Fault Data display, latched binary outputs and LEDs by

using the TEST/RESET

2.4

The relay PSU can be directly connected to any substation dc system rated from 30V dc to 220V dc.

In the event of the station battery voltage level falling below the relay minimum operating level, the PSU will

automatically switch itself off and latch out – this prevents any PSU overload conditions occurring. The PSU is

reset by switching the auxiliary supply off and on.

2.5

The operator interface is designed to provide a user-friendly method of controlling, entering settings and retrieving

data from the relay.

The warning and information labels on the relay fascia provide the following information:

Dielectric Test Voltage 2kV

Impulse Test Above 5kV

Caution: Refer to Equipment Documentation

Caution: Risk of Electric Shock

button. The front cover is used to secure the relay assembly in the case.

Figure 2.5

7SR21 with 3 + 8 LEDs in E6 Case

7SR21 & 7SR22 Argus Description of Operation

Chapter 1 Page 15 of 71

Table of Contents

Show Quick Links

Table of Contents

7sr22