Bender IR420-D6-2

 Insulation monitoring for de-energised

TN, TT and unearthed systems AC, 3(N)AC

and DC

• Nominal voltage extendable via coupling

device

• Two separately adjustable response values

100 kΩ…10 MΩ

• LEDs: Power On LED, LEDs Alarm 1,

Alarm 2 for signalling insulation faults

• Combined test/reset button

• Two separate alarm relays with one

changeover contact each

• Fault memory behaviour, selectable

• Push-wire terminal

(two terminals per connection)

The “Offline monitor” ISOMETER® IR420-D6 monitors the insulation resistanceof deenergized

loads. These loads, e.g. fire pumps, slidevalves drives, elevator motors or emergency

generators, either temporarily deenergized or deenergized for the most time, are upplied

from TN, TT or IT systems. The maximum permissible nominal voltage depends on the

nominal contact voltage of the N/C contact of K3 (switch-on contactor).

The nominal voltage range can be extended with a coupling device. A low-impedance

connection between the active conductors is necessary to correctly monitor the de-energised

cables. An inductive star-point coupling device DS2-31 and an inductive load AG70 are

available for the monitoring of de-energised lines. The maximum permissible system leakage

capacitance Ce is 10 μF. Any other use than that described in this manual is regarded as

improper.

Application

• De-energised loads such as automatic fire extinguisher pumps, emergency drives, ship

cranes, slide-valve drives in supply lines (gas, water, oil), motor-driven closing systems,

diving pumps, drives for anchors, elevators, flue-gas valves and emergency power

generators

Function

When the insulation resistance between the system conductors and earth falls below the

set response value, the alarm relays switch and the alarm LEDs light up. The measured

value is indicated on the internal LC display. In this way any changes, for example when

circuits are connected to the system, can be recognised easily. The fault memory can be

reset by pressing the reset button. The device function can be tested using the test button.

Two separately adjustable response values with one alarm relay each allow prewarning

already in case of very high-resistance insulation faults. When the lower response level is

reached, an interlocking function will be activated and the connection of a defective load

can be prevented.

The insulation resistance is measured via the output L1 or via a contact to the system being monitored. The contact is controlled via the external contact element K3. With the

contact in closed position, the system is de-energised and the insulation resistance is being measured. If the system or load is in operation, K3 opens the contact and insulation

monitoring is deactivated. Make sure that the main switch disconnects all poles. To ensure

that the measuring voltage can be superimposed onto the system, a low-resistance connection

must exist between all line conductors (e.g. by motor windings).

Note: If the IR420-D6 is operated via a coupling device, the auxiliary contact (N/C contact)

of K3 between the ISOMETER® and the coupling device need not to be designed for the

nominal voltage of the system. A rated contact voltage of AC 230 V will be sufficient here.

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