Bender ISOMETER isoCHA425HV Manual page 13

ISOMETER® isoCHA425HV
2.3.10.1 Cyclic background test
The cyclic background test checks the functionality of the C. It is not visible to the user and does not influence
the measuring function. In case of malfunction, the respective device error messages "E.09" to "E.16" appear.
2.3.10.2 Continuous PE connection monitoring
The connection of terminal "E" of the AGH to the PE protective conductor is monitored continuously and
in parallel with the measuring function of the device via the input "KE" of the ISOMETER®, which is also
connected to the PE protective conductor. When the connection is interrupted, error code "E.01" appears for
PE connection error.
2.3.10.3 User-controlled test functions
The user-controlled test functions interrupt the measuring function of the device. They always include a test
of the measurement technology (error code "E.05") and additionally a test of the connection between the
terminals L1/+ and L2/– via the system to be monitored (error code "E.02") which can be activated by the user
(menu "SEt" / "nEt").
If these test functions are started via a test button or the communication interface, this can be indicated
not only by the LEDs AL1 and AL2 lighting up but also by the message "test" via the relays (menu "out" /
"Signalling assignment").
System connection test
The system connection test configurable in the menu "SEt"/"nEt" checks the connection between the terminals
L1/+ and L2/– via the monitored system. For the ISOMETER® to function correctly, the monitored system must
have a low internal resistance R < 1 k .
i
The "on" setting is used in systems with U < DC 100 V. When "on U" is set, the system voltage must be
n
U > DC 100 V during the test.
n
If an error is detected, the message Device error system connection "E.02" appears. If the System voltage U
n
is below DC –30 V during the mains connection test, the message Device error polarity reversal "E.03" also
appears.
Internal and external test button
Pressing the external test/reset button or the test button "T" on the device (> 1.5 s) starts the user-controlled
test functions. Holding the test button "T" on the device also shows all available display elements.
Timer for test functions
At menu item "t"/"test" the user-controlled test can be activated in a cycle of one or 24 hours. The timer
restarts after each completed test, regardless of whether it was triggered by the timer or manually.
Device test at device start
At menu item "SEt"/"S.Ct" the execution of the user-controlled test functions can be activated for the time of
the device start.
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