Function
21
IRDH275BM-7_D00123_06_M_XXEN/07.2018
Self test
A self test can be carried out manually using the TEST button or automatically.
In order to guarantee high functional reliability, the ISOMETER® IRDH275BM-
7 provides comprehensive self test functions. After switching the supply volt-
age on, all internal measuring functions, the components of the process con-
trol such as data and parameter memory as well as the earth connections are
checked using the self test functions. The progress of the self test is indicated
on the LC display by a bar graph. Depending on the conditions in the IT sys-
tem to be monitored, the self test is running for 15…20 seconds, then the
message "Test ok!“ appears on the LC display for approximately 2 seconds.
Then the device returns to the standard mode and the current measuring val-
ue is displayed after the expiry of the measuring time.
When a fault is found at the terminals
and KE, the message "!Error!" ap-
pears on the LC display, the system fault LED lights up, the relay K2 (21-22-24)
switches and the respective fault message (see table) is indicated. If such a sys-
tem fault occurs, a self test is started again every minute. If no more malfunc-
tion is detected, the fault message is deleted automatically and the system
fault LED extinguishes.
During operation, the self test function can be started by pressing the TEST
button (internal or external). The self test can also be started automatically
every hour or every 24 hours by selecting "ISO ADVANCED: Autotest" menu.
The alarm relays Alarm1/2 only switch after starting the self test function by
pressing the TEST button, that means if an automatic self test has been select-
ed, the alarm relays do not switch.
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