Bender A-ISOMETER IR1570 Series Operating Manual page 11

Function
Self test
In order to guarantee high functional reliability, the A-ISOMETER IR157x
provides comprehensive self test functions. After switching the supply voltage
on, all internal measuring functions, the components of the process control
such as data and parameter memory as well as system and earth
connections are checked using the self test functions. The progress of the self
test is indicated on the display by a bar graph. Depending on the system condi-
tions, the self test is running 15...20 seconds, then the message "Test ok!"
appears on the LC display for approximately 2 seconds. Then the device returns
to normal measuring mode and the current measuring value is displayed
after the expiry of the measuring time.
When a fault is found, the message "!Error!" appears on the 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 system fault occurs, a self test
is started again every minute. If no more malfunction 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 alarm relays Alarm1/2 only switch after
starting the self test function by pressing the TEST button.
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TGH1370en/12.2019