Bender ISOMETER isoCHA425 Manual page 12

Function
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 L+ and L– 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').
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 user-controlled test functions can be activated for device start.
System connection test
The system connection test configurable in the menu 'SEt'/'nEt' checks the connection between the terminals
L+ and L– via the monitored system. For the ISOMETER® to function correctly, the monitored system must have
a low internal resistance R
If an error is detected, the message Device error system connection 'E.02' appears. If the System voltage U
is below DC –30 V during the mains connection test, the message Device error polarity reversal 'E.03' also
appears.
Error codes
In the event of a device error, error codes are shown in the display. Some of these are described below:
Overview of some error codes
Error code
PE connection error
The connection of 'E' or 'KE' to earth is interrupted.
E.01
Action: Check connection, eliminate error. The error code will be erased automatically once the
error has been eliminated.
System connection error
The internal resistance of the system is too high or the connection of 'L+' or 'L–' to the system is
E.02 interrupted. The terminals 'L+' and 'L–' are connected incorrectly.
Action: Check connection, eliminate error. The error code will be erased automatically once the
error has been eliminated.
Reversed polarity connection error
Terminals 'L+' and 'L–' are connected to the DC system to be monitored with reversed polarity.
E.03
Detection from U
12 isoCHA425_D00352_03_M_XXEN/08.2023
< 1 k .
i
˂ DC –30 V
n
Meaning
n