Function
28
IRDH375_D00124_05_M_XXEN/01.2020
ISOnet Function (COM SETUP)
Select "ISOnet=ON" from the COM SETUP menu to activate this function. This
function is a type of scanning function. The BMS Master activated via the
ISOnet function controls the ISOnet Slave devices via the BMS bus. Once an
ISOMETER® has finished its measurement cycle, the authorization for measur-
ing the insulation resistance is passed on from the ISOnet Master to the next
Slave. While an ISOMETER® is carrying out a measurement all other
ISOMETER®s are in the STANDBY mode. In this way it can be prevented that
the ISOMETER®s disturb each other in interconnected systems. In comparison
to the solution coupling switches and function input F1/F2, the response time
is prolonged, since no continuous measurement takes place. The advantage
is that no auxiliary contacts of a coupling switch are required. Furthermore,
this solution is ideally suited for capacitive IT systems or IT systems connected
via diodes.
An ISOnet Slave checks whether there is a Master available in the network. If
there is no Master available, the fault message "ISOnet Master?" appears on
the display after approximately 1 h. Additionally, the LED for device errors
lights and the Relay K3 switches. When the ISOnet function is activated, the
function input F1/F2 will be disconnected.
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