5
Front panel
Fig. 3. Front panel of the combined overvoltage and undervoltage relay module SPCU 3C14.
12
IRF
>
U
23
U
31
U
U
1315
[ ]
s
k
>
t
0.5
0.05
1.0
0.8
0.4
5.0
1.0
12
0.8
1.2
1.6
STEP
RESET
SG1
0
1
1
2
3
4
5
6
7
8
<
U
n
U
>
U
<
t
[ ]
s
>
U
<
U
SPCU 3C14
B
n
U
<
U
1.2
STEP
Indicators for measured voltages
Setting knob and indicator for
starting value of stage U>
Setting knob and indicator for
operate time t> or time multiplier k>
of stage U>
Setting knob and indicator for
starting value of stage U<
Setting knob and indicator for
operate time t< of stage U<
Simplified module symbol
Self-supervision alarm
indicator
Numerical display
Display step push-button
Selector switchgroup SG1
Indicator for switchgroups
SG1, SG2 and SG3
Reset push-button
Operation indicators
Type designation of
the relay module
Start and
operation
indicators
Each stage has its own yellow/red operation
indicator. Yellow light indicates starting of the
operation stage and red light indicates that the
stage has delivered a tripping signal.
The four LED indicators can, independently of
one another, be given self-reset or manual reset
mode of operation with switches in switchgroup
SG2. The manual reset mode means that the
indicator remains lit after being switched on,
although the stage, which controls the indica-
tor, resets. If, for instance, the yellow start
indicator has been given self-reset mode of
operation and the red operation indicator
manual-reset mode of operation, the yellow
indicator is lit, when the stage starts and it turns
red if the stage operates. When the stage resets
after operation the red indication remains lit. If
the stage starts but does not operate the yellow
indicator is lit during the starting and reset
automatically when the stage resets. The indica-
tors, which have been given the manual reset
mode, are reset locally by pushing the RESET
push-button on the front panel or by remote
control over the SPA bus using the command
V101 or V102. See also table (for switchgroup
SG3) on page 7 in chapter "Selector switches".
An unreset operation indicator does not affect
the protective functions of the relay module.
The relay module is constantly operative, re-
gardless of the indicators have been reset or not.
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.
