Function
19
isoPV425_D00028_09_M_XXEN/05.2018
Internal device errors "E.xx" can be caused by external disturbances or inter-
nal hardware errors. If the error message occurs again after restarting the
device or after a reset to factory settings (menu item "FAC") , the device must
be repaired.
After eliminating the fault, the alarm relays switch back automatically or by
pressing the reset button.
The self test can take a few minutes. It can be suppressed for the duration of
the device start by setting the parameter in the menu "SEt" to "S.Ct = off". This
allows the ISOMETER® to enter measurement mode quickly after connecting
the supply voltage U
s
.
Automatic self test
The device runs a self test after connecting the power supply and then every
24 h (selectable: off, 1h, 24 h).
Manual self test
A self test is initiated by pressing the test button "T" for a period greater than
1.5 s. While pressing the internal test button, all display elements available for
this device are shown.
Connection monitoring
Connection monitoring, activated by the self test, checks the connections of
terminals "E" and "KE" to the protective earth conductor (PE).
When an error is detected, the message device error ("Err") will be signalled
and the error code "E.01" appears on the display.
The system connection monitoring is used to check the connection of termi-
nals "L1/+" and "L2/-" to the system to be monitored. When an interruption or
a high-resistance connection between L1/+ and L2/- is detected via the inter-
nal resistance of the system, the device error ("Err") will be signalled and the
error code "E.02" appears on the display. Since a test of the system connection
may take considerable time due to system disturbances or may even provide
incorrect results, the system connection monitoring can be disconnected us-
ing the parameter "nEt" in the "SEt" menu.
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