DOLD RL 5898 Orijinal Talimatların Çevirisi - Sayfa 2

Ölçüm Cihazları DOLD RL 5898 için çevrimiçi göz atın veya pdf Orijinal Talimatların Çevirisi indirin. DOLD RL 5898 12 sayfaları. Varimeter imd insulation monitor

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Function

The device is supplied with DC auxiliary voltage via terminals A1(+) / A2.

Switching on the auxiliary voltage (Power-On) is followed by an internal

self-test for 12 s (see „Device test functions"). The test process is visible

with the status LED. After this, measurement of the insulation resistance

in the measuring circuits begins and the status LED changes into green.

Measuring circuit

(Insulation measurement between terminals L(+) / L(-) and PE1/PE2)

The insulation monitor RN 5897/240 can be used both with ballast (VSG)

and without VSG. Max. mains voltage and connection diagrams have to

be observed!

If the insulation monitor is operated without coupling device the terminals

L(+) and L(-) have to be connected directly to the voltage system to be

monitored. and the terminals VSG1/L(+) and VSG2/L(-) each have to be

bridged (see also operation with coupling device).

A broken wire detection that can be disabled provides a fault signal if both

terminals L(+) and L(-) are not linked by the connected network.

The type of the voltage system or the connection method (AC, DC, 3NAC)

has to be correctly adjusted on the rotational switch "UN".

Also the terminals PE1 and PE2 have to be connected with 2 separate

wires to the protective earth. An interruption of a wire also causes a fault

signal (see section "Behavior on faulty connection"). The monitoring of

the PE connection cannot be de-activated.

To measure the insulation resistance an active measuring voltage with

changing polarity is connected between L(+) and L(-) and PE1/PE2.

At the end of a measuring cycle the actual insulation resistance is produced

and indicated. The relay for alarm K1 switch when dropping under the

adjusted response value. In addition the status LED lights up red on alarm.

Manual reset of fault message

With the 2-section rotational switch "UN", manual or auto reset of the alarm

can be selected. If manual reset is activated the insulation fault signal of

the measuring circuit is stored when dropping under the adjusted response

value also if the insulation resistance goes back to healthy state. Pressing

the „Reset" button on the front side for 2 s, the alarm signal is reset if the

actual insulation resistance is in healthy state.

Indicator relay for insulation fault and device failure

The function of the relays K1 (contacts 11-12-14 for alarm) and K2

(contacts 21-22-24) can be altered between energised on trip (relay n.o.)

or de-energized on trip (relay n.c.). When energised on trip the relays

energize when the value drops below the setting or at decive failure, when

de-energised on trip, the relays de-energize when the value drops below

the setting or at device failure.

Semiconductor output to indicate the insulation resistance

On terminals Y1(+)/Y2 a galvanically separated semiconductor output is

available as PWM (Pulse width modulated) signal that shows the actual

insulation resistance. It is an opto-coupler output with open collector.

This means that an external circuit is required (ext. supply voltage and

pull up/down resistor).

Disable the measuring function

Using the external control input X1/X2 the measuring function of the

RN 5897/240 can be disabled. This could be used when several isolated

voltage systems with individual insulation monitors need to be coupled.

The measuring voltage is set to -90V (negative measuring phase) and

the evaluation of the measurement is stopped. The status of the output

relays is frozen and not changed any more. If the measurement is disabled

the status LED flashes continuously orange. Please be aware, only the

evaluation of the measurement is stopped and the measuring pulse is

interrupted! A high resistive disconnection to PE does not take place

(see internal resistance).

Function

Broken wire detection

As described in section "Measuring circut", the measuring circuits L(+)/L(-)

and the protective conductors PE1/PE2 are constantly monitored for wire

breaks – not only at Power-On or a manual or occasional automatic test.

The response time of PE1/PE2 monitoring is only a few seconds. The

response time of monitoring of L(+)/L(-) can be up to approx. 2 min. Broken

wire detection between L(+) and L(-) is performed via coupled alternating

voltage. This alternating voltage is short-circuited if the terminals are

connected to the connected mains at low-resistance. The device detects

that the mains to be monitored is properly connected.

Since this broken wire detection is carried out with alternating voltage, large

capacitances should be avoided between L(+) and L(-), since the capacitive

reactance of these capacitances also short-circuits this alternating voltage.

The device would no longer detect a connection fault on L(+)/L(-).

Especially parallel lines should be prevented over larger distances.

If larger capacitances between L(+)/L(-) cannot be avoided or if the coupled

alternating voltage interferes with the system, the broken wire detection

can be de-activated on the 2-section rotational switch "Rel. /VSG". It can

be altered between continuously disabled (Broken Wire Detect OFF), or

continuously enabled (Broken Wire Detect ON) for 10 seconds every 2

minutes. If the broken wire detection on L(+)/L(-) is de-activated no AC voltage

is injected. The broken wire detection on PE1/PE2 cannot be de-activated.

Device test functions

Principally, 2 different test functions are implemented: The "self-test" and

the "expanded test":

The self-test of the device is performed automatically after Power-On and

every full operating hours. It can also be triggered manually at any time by

pressing the "Test" button at the device front for 2 s.

With the self-test, contrary to the expanded test, the status of the Indicator

relays is not affected; the sequence is as follows:

The self test is indicated by the status LED with flash code 1 in orange colour.

First the negative measuring pules is activated for about 5 s and the internal

measuring circuit is checked on failures. Then the positive measuring pulse

is activated for about 5 s and more internal tests are performed. If no failures

are detected, the normal measurement continuous. The extended test is

started, when during or at the end of above procedure (12 s) the button

"Test" is pressed again for 2 s.

The procedure is the same as above (2 measuring phases with 5 sec each)

but in addition the output relays K1 and K2 go into alarm state and the PWM

on the semiconductor output drops to the lowest value. The Status LED

shows flash code 2 in orange colour. The test phases will be continuously

repeated. The extended test can be finished after the first complete

sequence (approx. 10 sec) by pressing the "reset" button for 2 seconds.

The device starts the insulation monitoring again.

Self test (Test 1)

Insulation

measurement

Duration: approx. 12s

Positive

Measuring voltage

Negative

Test signal

Reset signal

Alarm

Relay state K1 and K2

No Alarm

Test signal: Button Test > 2 s or X1/X2 > 1.5 s and < 10 s

Reset signal: Button Reset > 2 s or X1/X2 < 1.5 s

To initiate the extended test (Test 2) the test signal must be operated

within the self test (Test 1) again.

The reset signal has here no function, as the first complete sequence

of extended test (Test 2) is not finished.

Self test (Test 1)

Continuous extended

Insulation

Duration: approx. 12s

test (Test 2)

Duration: approx. 10s

07.07.23 en / 755A

Insulation

measurement

M12462