
32
Fault codes
Once the self-supervision system has detected a
permanent relay fault, the IRF LED on the front
panel of the module is lit, and at the same time
the normally operated signal relay of the self-
supervision system drops off.
In most fault situations an auto-diagnostic fault
code is shown on the relay display. The fault
code cannot be reset. The fault code consists of
a red digit one (1) and a green code number
that indicates the fault type. The fault code
should be recorded and stated when service is
ordered.
The fault codes of the synchro-check relay mod-
ule SPCU 3D45 are explained in the following
table:
Fault
Explanation
code
1
Power reset
4
Faulty output relay path or missing output relay card
30
Faulty program memory (ROM)
50
Faulty working memory (RAM)
51
Faulty parameter memory (EEPROM) for block 1
52
Faulty parameter memory (EEPROM) for block 2
53
Faulty parameter memory (EEPROM) for block 1 and 2
54
Faulty parameter memory (EEPROM) for block 1 and 2 with different checksums
56
Faulty parameter memory (EEPROM) key
195
Too low a value in reference channel with multiplier 1
131
Too low a value in reference channel with multiplier 5
67
Too low a value in reference channel with multiplier 25
203
Too high a value in reference channel with multiplier 1
139
Too high a value in reference channel with multiplier 5
75
Too high a value in reference channel with multiplier 25
253
No interruptions from the A/D-converter
Calculation of
the checksum
Example of calculating the checksum of selector switchgroup SGF.
Switch No
Position
Weighting coefficient
Value
SGF/1
1
x
1
=
1
SGF/2
0
x
2
=
0
SGF/3
1
x
4
=
4
SGF/4
0
x
8
=
0
SGF/5
0
x
16
=
0
SGF/6
0
x
32
=
0
SGF/7
1
x
64
=
64
SGF/8
0
x
128
=
0
Checksum of switchgroup SGF
∑
=
69
When the checksum calculated according to the
example equals the checksum indicated on the
display of the relay module, the switches in the
concerned switchgroup are correctly set. An ex-
ample of calculating the checksum and detailed
information of keypad operations is contained
in the general description of the D-type SPC
relay modules.