ABB SPAC 315 C User Manual And Technical Description page 32

Energizing current
input circuit
supervision
(modified 96-02)
6
The supervision function of the energizing cur-
rent input circuit detects interruptions of the
energizing circuit. The supervision unit can be
given a two-phase or three-phase function with
parameter S203. The supervision is based on
comparison between the measured phase cur-
rents. If one or two phase currents exceed 12%
of the rated value I , while in one or two phases
n
the measured phase current is below 6% of the
rated current I , an alarm is given in the form
n
of a flashing "C.I.F" message (Current Input
Fault) on the display after a set operate time
delay. By default the alarm signal is connected
to the alarm output contact SIGNAL 4. If this
output contact is already used as an alarm out-
put of e.g. earth fault protection, by setting pa-
rameter S202 = 2, the energizing current input
supervision alarm can be configured so that only
display alarm and event is generated.
IL1
IL2
IL3
Fig. 2. Principle of the supervision function of the energizing current input circuit.
SG1/2=0
S202>0
0.12xIn
0.12xIn
>1
0.12xIn
0.06xIn
>1
0.06xIn
0.06xIn
The operate time delay can be set with param-
eter S204 in the range of 3...60 s. The default
value is 15 s. The monitoring function is disa-
bled if all input currents are under 6% of I
The fault message can be locally acknowledged
by pressing the push-buttons STEP and SE-
LECT ∩ simultaneously.
Note!
Only the display indication needs acknowledg-
ing, not the alarm signal output. The alarm
output will reset automatically when the fault
disappears.
The phase current values can be called up on
the display by means of the STEP push-but-
ton.
S204
&
3...60s
STEP+
SELECT
.
n
SIGNAL4
S202=1
C.I.F.