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04.03.20 en / 201A
The Measuring circuit includes an external residual current transformer.
All conductors of a voltage system are fed through the transformer except
the ground wire. In a healthy system the sum of all flowing currents is zero,
so that no voltage is induced in the CT. If an earth fault occurs, sourcing a
current flowing to ground, the current difference induces a current in the
CT that is detected by the RN 5883.
If an earth fault occurs, sourcing a current flowing to ground, the current
difference induces a current in the CT that is detected by the RP 5883.
On broken sensor wires and broken CT coils the unit goes into alarm state
and the LEDs for pre-alarm (yellow) and alarm (red) flashes.
The unit has 2 changeover output contacts. One for alarm 11, 12, 14 and
21, 22, 24 and one for pre-alarm.
4 Setting Ranges can be slected from 10 mA to 3 A. The fine adjustment
is made via potentiometer „Factor“
Measuring range = Range x Factor.
The alarm relay switches at 100 % of the adjusted response value.
The pre-alarm can be set in 10% steps between 10 and 100% of the
alarm value.
Potentiometer t
v
sets the switching delay between 0 and 10 seconds. The
delay reacts on pre-alarm and alarm.
The different CT sizes require a correct adaption of the residual current
monitor. 3 models are available:
Type
Suitable
residual current
transformer
Frequeny range
RN 5883.12/61
ND 5015/024
ND 5015/035
DC + AC up to 250 Hz
RN 5883.12/010/61
ND 5015/070
DC + AC up to 180 Hz
RN 5883.12/020
ND 5018/105
ND 5018/140
ND 5018/210
DC + AC up to 60 Hz
Table 1
An external link on X1-X2 allows the change between energized and de-
energized on trip. A change of the function will only be valid after interrup-
tion of the supply voltage.
Terminal X1 / X2: external link =
De-energized on trip,
open =
Energized on trip
De-energized on trip: In the case of groundfault or missing auxiliary supply
the relays are de-energized,
the NC contacts 11/12; 21/22 are closed
In fault free state the relays are energized,
the NO contacts 11/14; 21/24 are closed
Energized on trip:
In the case of groundfault the relays are energized,
the NO contacts 11/14; 21/24 are closed
in fault free state the relays are de-energized,
the NC contacts 11/12; 21/22 are closed
If an adjusted value is reached on the measuring input (alarm or pre-
warning)at the standard type RN 5883 the signal is stored. Reset is made
by pressing the button „Test/Reset“ for < 3 s s or by disconnecting the
auxiliary supply (approx. 30 s).
If the „Test/Reset“ button is pressed for > 3 s, a test of the unit is made.
The time delays run, the pre-warning and alarm is activated.
An LED chain shows the fault current between 10 and 100 % of the adju-
sted alarm value.
An analogue output 0 ... 10 V indicates also the fault current. 10 V corre-
sponds to 100 % of the adjusted alarm value.
It is of advantage to keep the range small and the Factor high.
Example: Setting 300 mA: Range 0,1 x Factor 3 = 300 mA
Set-up and Adjustment Facilities
Function
M11736
LED "ON"
U connected
H
LED „Pre-Alarm“
LED "Alarm"
LED chain
I
=
e.g.
pA
IA x setting in %
: I
= 60mA x 50% = 30mA
Pre-alarm relay trips at 30mA
LED chain shows at that moment 50%
pA
Pushbutton
<3s = reset fault memory
>3s = devise test
I : Pre-Alarm
pA
I : Alarm value = Range x Factor
A
e.g.: I = 0,01A x 6 = 60mA
A
I = Alarm relay trips at 60mA
LED chain shows at that
moment 100%
A
t : response delay reacts on Alarm
and Pre-Alarm
v
RN 5883.12/001
