Visual Inspection; Precautions; Status Input Tests - Siemens 7SG11 Technical Manual

permanently on and should not flash. After the relay has completed its startup initialisation routines, the
LCD backlight will be switched on the display will revert to whichever screen was last selected.
At this point a continuity tester can be used to check that the chosen watchdog relay contacts are in
their correct position for a healthy energised relay.

3.6 Visual Inspection

If the relay is powered up and in a healthy state, remove the relay cover and perform the following
checks :
1. Press CANCEL a number of times to so that the relay displays the identifier screen. Now press
TEST/RESET so that an LED test is initiated. The yellow Starter and red Trip LED's should
operate momentarily and the LCD will display 'LED Test' .
2. View the LCD from a point directly in front of the relay. If the LCD is too faint or too dark then
adjust the contrast by inserting a small flat screwdriver into the hole on the fascia above the LCD.
The potentiometer is a multi-turn type and may require a number of turns before any changes are
seen. Turning clockwise will increase the contrast, anti-clockwise will reduce the contrast. Ensure
that the contrast is not too dark otherwise scrolling alarm screens will not be displayed clearly.

3.7 Precautions

Before testing commences the relay should be isolated from the voltage transformers in line
with the local site procedures. The closing and alarm circuits should also be isolated where
practical. Ensure that the correct dc auxiliary voltage is applied to the circuit. See the
relevant scheme diagrams for the relay connections.

3.8 Status Input Tests

This test checks that the status input circuits are functioning correctly. The status input circuits should
be energised in turn and observed to be operating using the instruments mode 'Status Inputs' display.
A '1' indicates that the status circuit is energised, a '_' indicates that it is not.
Note : if the Status Invert feature is used, then when an input is externally energised, the instrument
display will show a '_'. When the input is de-energised it will display a '1'.
Connect the correct dc voltage to the following terminals to energise the status inputs :
For E4 case size relays :
Status Input
Status 1
Status 2
Status 3
Status 4
For E6 case size relays :
Status Input
Status 1
Status 2
Status 3
Status 4
Status 5
Status 6
Status 7
Status 8
Status 9
Record the operation of the Status Inputs in Table 1.
©2011 Siemens Protection Devices Limited
+ DC Volts
5
27
26
25
+ DC Volts
3
35
33
31
29
43
41
39
37
7SG11 Argus 8 Commissioning
- DC Volts
6
28
28
28
- DC Volts
4
36
34
32
30
44
42
40
38
Chapter 7 Page 5 of 12