IRDH275BM-7_D00123_07_M_XXEN / 08/2020 21
ISOMETER® IRDH275BM-7
4.4
Menu ISO SETUP: Setting of the basic ISOMETER® functions
All alarm functions such as Alarm 1 and Alarm 2 (prewarning and main alarm), the operating principle
of the alarm relays K1 and K2 (N.O = N/O operation, N.C = N/C operation), the fault storage behaviour
and a selection of two current output ranges are set in this menu.
4.4.1 Response values Alarm 1 and Alarm 2
The response values Alarm 1 and Alarm 2 are selected with the UP/DOWN keys and stored with the
ENTER key.
4.4.2 Operating principle of the alarm relays
K1/K2 are factory set to N.O Test, that means N/O operation. When the supplement „Test“ has been se-
lected, the alarm relays switch over during a manual self test.
If, for any reason, the alarm relays may not switch over during a manual self test, the settings N.C or N.O
are to be selected
K1: N.C Test
N/C operation contacts 11-12-14, with relay test
(the alarm relay is energized during normal operation)
K1: N.O Test
N/O operation contacts 11-12-14, with relay test
(the alarm relay is deenergized during normal operation)
K1: N.C
N/C operation contacts 11-12-14, without relay test
(the alarm relay is energized during normal operation)
K1: N.O
N/O operation contacts 11-12-14, without relay test
(the alarm relay is deenergized during normal operation)
K1: Flash
Flashing function contacts 11-12-14
(the alarm relay and the LED flash in the event of an alarm message, approximately 0.5 Hz)
K2: N.C Test
N/C operation contacts 21-22-24, with relay test
(the alarm relay is energized during normal operation)
K2: N.O Test
N/O operation contacts 21-22-24, with relay test
(the alarm relay is deenergized during normal operation)
K2: N.C
N/C operation contacts 21-22-24, without relay test
(the alarm relay is energized during normal operation)
K2: N.O
N/O operation contacts 21-22-24, without relay test
(the alarm relay is deenergized during normal operation)
K2: Flash
Flashing function contacts 21-22-24
(the alarm relay and the LED flash in the event of an alarm message, approximately 0.5 Hz)
