Front Panel; Operation Indicators - ABB SPAC 531 C User Manual And Technical Description

Front panel

Operation
indicators
On-display indicators for the
measured parameters U
i.e. I sinϕ or I cosϕ
0 0
Setting knop and indicator for the
start current of stage Iϕ>
Setting knop and indicator for the
operate time of stage Iϕ>
Setting knop and indicator for the
start current of stage Iϕ>>
Setting knop and indicator for the
operate time of stage Iϕ>>
Fig. 3. Front panel of the directional neutral overcurrent relay module SPCS 3C4.
Both neutral overcurrent stages are provided
with a yellow/red indicator. Yellow light indi-
cates starting of the concerned overcurrent stage
and red light indicates that the overcurrent stage
has operated (tripped).
The four indications, two starts and two tripp-
ings, can be given with switches in SG2 a self-
reset mode of operation or a manual mode. If,
for instance, the yellow start indication (but not
the red operation indication) of a protection
stage is given the manual mode, the yellow
indication is lit when the protection stage starts
and turned red when the stage operates. When
the protection stage returns to normal the yel-
low indication remains lit. Manual reset indica-
tions are reset py pushing the RESET push
B
U
o
, I and Iϕ,
0 0
STEP
I ϕ
>
[ ]
%
I
n
1.0
t [ ]
> s
0.1
I ϕ
>>
[ ]
%
I
n
5
[ ]
t
>> s
0.1
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. See also table (for 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 apparatus
I
symbol
Self-supervision alarm
ϕ
I I
IRF
o
indicator (IRF)
Display for set and
measured values
6.0
STEP
Display step push button
10
0.6
SG1
1
1.0
2
Selector switchgroup
3
4
SG1
5
30
6
7
8
40
Indicators for
0
1
switchgroups
SG1, SG2 and SG3
RESET
0.6
Reset push button
1.0
I ϕ I ϕ
> >>
Operation indicators for
stage Iϕ> and stage Iϕ>>
Relay module type
SPCS 3C4
designation
5