DOLD VARIMETER RCM Técnica de instalação / monitorização - Página 2
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Function
The function of the IL/SL 5882 and IR 5882 can be compared to a fault
current circuit braker unit. It detects and indicates residual currents, but
does not disconnect.
The measurement is done by an external residual current transformer e.
g. ND 5016 which is connected via terminals i and k to the IL/SL 5882.
At the device IR 5882 the residual current transformer is integrated. All
conductors of the voltage system to be monitored are run through the CT
except the ground wire. In a fault free voltage system the sum of all current
is 0 and the CT induces no secondary voltage. If due to an insulation fault
a fault current flows to ground, the current difference in the CT creates a
measuring current, which is detected and measured by the IL/SL 5882 or
IR 5882. A broken wire in the sensing circuit would disable the measurement,
therefore a special circuit detects broken wire and forces the unit to trip.
The unit has 2 x 1 changeover contacts. Contact 11-12-14 for alarm (AL)
and 21-22-24 for prewarning (VW). Prewarning is detected at 70 % of
the selected alarm value. With external bridge X1-X2 the alarm is stored
and has to be reset by pressing the reset button or by disconnecting the
auxiliary supply. Without bridge X1-X2 the unit works with auto-reset and
the fault is not stored. With the button "Test" a fault can be simulated
(Alarm). Each contact is delayed with an adjustable time delay t
delay time for alarm and pre-warning).
To avoid unauthorised adjustment of the potentiometers the unit has a
transparent cover that could be seald with laquer. Two holes above the
push buttons allow activation of test and reset.
Circuit Diagrams
i
k
X1
X2
A1
A2
A1
A2
X1
X2
i
k
12
11
14
AL
22
21
24
VW
12
22
14
11
24
21
M8349_a
IL /SL 5882
X1 X2
A1
A2
A1
X1
L1/L2/L3/N
PE
12
11
14
AL
12
22
14
11
24
21
IR 5882
A2
X2
4
22
21
24
VW
M11134
Connection terminals
Terminal designation
A1, A2
i, k (only at IL/SL 5882)
X1, X2
11, 12, 14
21, 22, 24
Indication
green LED "ON":
red LEDs "VW", "AL":
(same
v
Note
If time is set to 0 and a pulsating fault current is flowing (e.g. 1-way rec-
tified) the output relay may flicker because of the short reaction time. By
increasing the time delay this effect can be avoided.
Setting
LED "ON"
LED "Prewarning"
LED "Alarm"
setting of
alarm value
time delay
for alarm
and prewarning
2
Signal description
Auxiliary voltage
Conn. f. external current transformer
ND5016, ND5019 ; terminals i, k
control input
X1/X2 bridged:
with manual reset of alarm
X1/X2 not bridged:
without manual reset of alarm
(Hysteresis function)
1. C/O contact (Alarm)
1. C/O contact (Pre-warning)
on, when supply connected
on, when insulation failure (prewarning and
alarm)
Test button
Reset button
M8369_b
15.01.20 en / 177A