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Front panel
Operation
indicators
Current measurement indicators
for phases L1, L2, L3
Indicator and start value setting
knop of overcurrent stage I>
Indicator and operation time or
time multiplier k setting knob of
overcurrent stage I>
Indicator and start value setting
knop of overcurrent stage I>>
Indicator and operation time
setting knop of overcurrent
stage I>>
Fig. 2. Front panel of the overcurrent relay module SPCJ 3C3.
Both overcurrent stages are provided with a
yellow/red indicator. Yellow light indicates start-
ing of the concerned overcurrent stage and red
light indicates that the overcurrent stage has
operated (tripped).
The four indications, two starts and two trip-
pings, can be given a self-reset mode of opersa-
tion or manual reset mode. If, for instance, the
yellow start indicator of the low-set overcurrent
stage I> has been given the manual reset mode,
the indicator is lit with yellow colour when the
overcurrent stage starts and turning red when
the stage operates. When the protection stage
returns to normal the yellow indication remains
lit. The indicators that have been given the
manual reset mode are reset by pushing the
RESET push-button or by the command V101
or V102 via the serial interface. The function of
the relay module is not affected by an unreset
operation indicator.
When the display of the relay module is dark
and one of the protection stages operates, the
B
>
I
I
>>
I
I
I
IRF
L1
L2
L3
STEP
1.5
I
>
STEP
I
n
0.5
2.5
0.5
t
[ ]
>
s
SG1
k
1
0.05
1.0
2
3
4
5
13
6
7
I
>>
8
20
I
n
0
1
2.5
RESET
0.5
t
[ ]
>>
s
0.04
1.0
I
I
>
>>
SPCJ 3C3
indicators for the measured values of the module
indicate the faulty phase, i.e. in which phase(s)
the current has exceeded the setting value of the
stage (so called phase fault indication). If, for
instance, the operation indicator of stage I> is lit
with red light and the indicators I
are lit, the relay operation was caused by over-
current on phases L1 and L2. The phase fault
indications are reset by pushing the STEP push-
button or the RESET push-button. See also
table (switchgroup SG3) on page 9 in chapter
"Selector switches".
The self-supervision alarm indicator IRF indi-
cates that the self-supervision system has de-
tected a permanent fault. The indicator is lit
with red light shortly after a permanent internal
fault has been detected. At the same time a
control signal is put forward to the output relay
of the self-supervision system. Additionally, in
most fault cases, a fault code indicating type of
fault appears on the display of the relay module.
The fault code is to be recorded to serve the
subsequent fault location and repair actions.
Simplified device symbol
Self-supervision system
alarm indicator
Display for set and
measured values
Display step push-button
Selector switchgroup SG1
Indicator for switchgroup
SG1, SG2 and SG3
Reset push-button
Start and operation
indicators
Relay module type
designation
and I
L1
L2
also
5
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