Operation and setting
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IRDH375_D00124_05_M_XXEN/01.2020
6.4 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) and the fault storage behaviour are set in this menu. The
current output for the IRDH275B can be selected from two value ranges.
6.4.1 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.
6.4.2 Operating principle of the alarm relays
"K1"/"K2" are factory set to N.O Test, that means N/O operation. When the sup-
plement "Test" has been selected, the alarm relays switch over during a man-
ual 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
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