ABB REM 610 Technical Reference Manual page 42

REM 610
42
Motor Protection Relay
Technical Reference Manual
Switchgroups and parameter masks
The settings can be altered and the functions of the relay selected in the SG_ selector
switchgroups. The switchgroups are software based and thus not physical switches
to be found in the hardware of the relay.
A checksum is used for verifying that the switches have been properly set. The
figure below shows an example of manual checksum calculation.
Switch Position
number
1 1
2 0
3 1
4 0
5 1
6 0
7 1
8 0
9 1
10 0
11 1
12 0
13 1
14 0
15 1
16 0
17 1
18 0
19 1
20 0
checksum
Fig. 4.1.4.12.-1 An example of calculating the checksum of a SG_ selector
switchgroup
When the checksum, calculated according to the example above, equals the
checksum of the relay, the switches in the switchgroup have been properly set.
The factory default settings of the switches and the corresponding checksums are
presented in the tables below.
Weighting
factor
x 1 =
x 2 =
x 4 =
x 8 =
x 16 =
x 32 =
x 64 =
x 128 =
x 256 =
x 512 =
x 1024 =
x 2048 =
x 4096 =
x 8192 =
x 16384 =
x 32768 =
x 65536 =
x 131072 =
x 262144 =
x 524288 =
SG_ ∑
=
1MRS 755537
Value
1
0
4
0
16
0
64
0
256
0
1024
0
4096
0
16384
0
65536
0
262144
0
349525