Datasheet

TDB101012en / Main catalogue part 1 – Insulation monitoring / 09.2011 33

1.1

A-ISOMETER® IR420

Operating elements Wiring diagram

1 - LED Power "ON", flashes in case of interruption of the connecting

leads earth/ KE or L1 / L2.

2 - Alarm LED "AL1", lights when the value falls below the set response

value Alarm 1 and flashes in case of interruption of the connecting

leads earth/KE or L1/L2).

3 - Alarm LED "AL2", lights when the value falls below the set response

value Alarm 2 and flashes in case of interruption of the connecting

leads earth/KE or L1/L2).

4 - LC display

5 - Test button "T": to call up the self test.

Arrow up button: Parameter change, to move up in the menu.

6 - Reset button "R": to delete stored insulation fault alarms

Abwärts-Taste: Parameter change, to move down in the menu.

7 - "MENU" button: to call up the menu system.

Enter button: to confirm parameter change

1 - Supply voltage U

(see ordering information) via fuse

2 - Separate connection of E and KE to PE

3 - Connection to the AC system to be monitored:

AC: connect terminals L1, L2 to conductor L1, L2.

4 - Alarm relay K1: Alarm 1

5 - Alarm relay K2: Alarm 2

6 - Combined test and reset button "T/R"

short-time pressing (< 1.5 s) = RESET

long-time pressing (> 1.5 s) = TEST

7 - Line protection by a fuse in accordance with IEC 60364-4-43

(6 A fuse recommended). In case of supply (A1/A2) from an

IT system, both lines have to be protected by a fuse.

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