23
After an operation the relay module indicates by
means of variable V6 the phases (phase indica-
tion) which have exceeded the setting value of
the low-set stage or the high-set stage at the
moment of operation. The same data are indi-
cated by the LED indicators of the module, see
section "Operation indicators". The data are
binary numbers coded to decimal numbers, so
that, for the low-set overcurrent stage as well as
for the high-set overcurrent stage, each phase is
represented by a specific number. The final code
is obtained by adding the separate phase code
numbers.
Coding of phase fault data:
Fault
Code
number
Low-set stage I> set value exceeded on phase L3
1
Low-set stage I> set value exceeded on phase L2
2
Low-set stage I> set value exceeded on phase L1
4
High-set stage I>> set value exceeded on phase L3
16
High-set stage I>> set value exceeded on phase L2
32
High-set stage I>> set value exceeded on phase L1
64
For instance when V6 = 7 (1 + 2 + 4), the low-
set current stage has operated (tripped) and the
current on each phase has exceeded the set start
value of the low-set stage I>.
Register data V6 includes two separate parts,
one for the low-set overcurrent stage and one for
the high-set overcurrent stage. If the low-set
overcurrent stage operates, the value of register
V6 is updated with regard to the codes 1, 2 and
4 only. If the high-set overcurrent stage oper-
ates, only the codes 16, 32 and 64 are updated.
A new value always erases the old recorded
value.
Register V6 can be set to zero either by pushing
the buttons STEP and RESET simultaneously
or by giving the variable V102 the value 1 via the
SPA bus.
Fault codes
Shortly after the self-supervision system has
detected a permanent internal fault the red fault
indicator IRF on the relay module front panel is
lit. At the same time the self-supervision system
puts forward a control signal to the output relay
of the self-supervision system. Further, in most
fault situations a self-diagnostic fault code is
shown on the display of the relay module. The
fault code is composed of a red number one (1)
and a green, one or two digit code number. It is
recommended that the fault code number is
noted down and passed forward to the service
shop when overhaul and repair of the faulty
relay module is ordered.
The three-phase overcurrent relay module SPCJ
3C3 may display the following fault codes:
Fault code
Type of fault
4
Trip signal path broken or output relay module missing
30
Faulty program memory (ROM)
50
Faulty random access memory (RAM)
195
Too low a value on the reference channel with multiplier 1
131
Too low a value on the reference channel with multiplier 5
