20
Function
Self-test
In order to guarantee high measuring accuracy, the A-ISOMETER
®
provides
comprehensive self-test functions. After switching on the supply voltage, 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 functions is indicated
on the display by a bar graph. Depending on the system conditions, the duration
of the self-test is 15 ... 20 sec., then the device indicates “Test ok“ for approx. 2
seconds. Then the device returns to the normal measuring mode and the current
measuring value is displayed after the expiry of the reading time.
If a fault is found, !Error!“ is indicated on the LC display, the system fault relay
K3 (31-32-34) drops, the system fault LED illuminates and the respective error
message (see table) is indicated. If there is such an error in the system, a self-test
will be started every 60 seconds. If no more errors can be detected, the error
B
B
B
B
B
B
B
B
B
B
B
B
B
B
An ISOnet Slave checks whether a Master is present in the network. If there is
no Master available, the display issues the fault message „ISOnet Master?“ If the
ISOnet function is activated, the function input F1/F2 will be disconnected.
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