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.
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