DOLD RN 5883 Інсталяції - Сторінка 2

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Set-up and Adjustment Facilities

LED "ON"

U connected

LED „Pre-Alarm"

LED "Alarm"

LED chain

I : Pre-Alarm

I =

IA x setting in %

e.g.

: I = 60mA x 50% = 30mA

Pre-alarm relay trips at 30mA

LED chain shows at that moment 50%

RN 5883.12/001

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

Function

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

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:

Suitable

Type

residual current

transformer

ND 5015/024

RN 5883.12/61

ND 5015/035

RN 5883.12/010/61

ND 5015/070

ND 5018/105

RN 5883.12/020

ND 5018/140

ND 5018/210

Table 1

I : Alarm value = Range x Factor

Pushbutton

<3s = reset fault memory

>3s = devise test

M11736

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:

De-energized on trip: In the case of groundfault or missing auxiliary supply

Energized on trip:

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.

Frequeny range

DC + AC up to 250 Hz

DC + AC up to 180 Hz

DC + AC up to 60 Hz

e.g.: I = 0,01A x 6 = 60mA

I = Alarm relay trips at 60mA

LED chain shows at that

moment 100%

t : response delay reacts on Alarm

and Pre-Alarm

external link =

open =

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

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

De-energized on trip,

Energized on trip

04.03.20 en / 201A