DOLD VARIMETER IMD RN 5897/300 Monitoring Technique - Page 4

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Indicators

Connection

measuring ciruit

Indicator relay

alarm and pre-alarm

External

control input

Indicators

The operational status of the device is indicated on a 3-colour LED:

Off:

No auxiliary voltage connected

Green:

Normal operation (Insulation resistance in healthy

state)

Red:

Alarm (measured value below alarm response value)

Orange:

Warning (measured value below pre-alarm response

value)

Orange flashing: Test mode procedure (see flashing code diagramm)

Red flashing:

Failure code (see flashing code diagramm)

Flash code

orange

Status-LED

(measuring circuit, measuring voltage,

(additional control of indicator relays)

Auxiliary

voltage

Protective

conductor

M11609_b

Description

Selftest

internal tests)

Advanced Test

Error Indication

Flash code

red

Failure cause

Status-LED

Broken wire detection

on L(+)/L(-).

Broken wire detection

on PE1/PE2.

Internal failure

continously

detected in

flashing

test mode

Faulty calibration

continously

values detected in

flashing

device memory.

Notes

Risk of electrocution!

Danger to life or risk of serious injuries.

WARNING

• Disconnect the system and device from the power supply and ensure

they remain disconnected during electrical installation.

• The terminals of the control input X1-X2 have no galvanic separation to

the measuring circuit L(+) and L(-) and are electrically connected together,

therefore they have to be controlled by volt free contacts or bridge.These

contacts ore bridges must provide a sufficient separation depending on

the mains voltage on L(+)-L(-).

• Please do not connect external voltage to terminals X1/X2. The control

must only be made by bridging X1 and X2.

Attention!

• Before checking insulation and voltage, disconnect the monitoring device

RN 5897 from the power source!

• In one voltage system only one insulation monitor can be used. This has

to be observed when interconnecting two separate systems..

• Device terminals PE1 and PE2 must always be connected via separate

lines to different terminal points of the protective-conductor system.

• The device must not be operated without PE1/PE2 connection!

• To ensure correct measurement of the insulation resistance, there must

be a low-impedance connection (≤ 10 kΩ) or a low-impedance internal

system resistance across the source or across the load between the

measuring circuit connections L(+) and L(-).

• To ensure correct measurement of the insulation resistance, there must

be a low-impendance connection (≤ 10 kΩ) or a low-impendance internal

mains resistance across the source or across the load between the

measuring circuit connections L(+) and L(-) (or L1(+) and L2(-) when

using the ballast unit).

Attention!

nfo

• The main measuring circuit can be connected with its terminals L(+) and

L(-) both to the DC and also AC side of a mixed network; it is done most

practically where the primary incoming power supply takes place e.g.

battery networks with connected inverters on the DC side, with Generators/

Transformers with connected Rectifiers or inverters on the AC-side. To

monitor a 3NAC system the device can be connected single pole, (L(+)

and L(-) are bridged, to the neutral of the 3p4w system. The 3 phases

have a low-ohmic (approx. 3 – 5 Ohm) connection via the transformer

windings so also insulation failures of the not directly connected phases

are detected. Via the rotational switch „UN" the correct type of network

needs to be selected (see „Connection Examples").

• If a monitored AC system includes galvanically connected DC circuits (e.g.

via a rectifier), an insulation failure on the DC side can only be detected

correctly, when a current of min 10 mA can flow via the semiconductor

connections.

• If a monitored DC system includes galvanically connected AC circuits (e.g.

via an inverter), an insulation failure on the AC side can only be detected

correctly, when a current of min 10 mA can flow via the semiconductor

connections.

Failure recovery

Check

measuring circuit

L(+) and L (-)

Check

protective earth

connections

PE1 and PE2

Press test button again or restart

the unit by interrupting the

auxiliary supply temporarily. If the

fault remains permanent, send

device back to manufacturer for

examination.

Send device back to manufacturer

for recalobration and examination.

10.11.23 en / 800A