Function
17
TGH1361en/11.2009
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 A-ISOMETER® has finished its measurement cycle, the authorization for
measuring the insulation resistance is passed on from the ISOnet Master to
the next slave. While an A-ISOMETER® is carrying out a measurement all
other A-ISOMETERs® are in the STANDBY mode. In this way it can be pre-
vented that the A-ISOMETERs® disturb each other in interconnected sys-
tems. 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. When the ISOnet function is activated, the function input F1/F2
will be disconnected.
BMS bus (A/B, RS485)
PE PE
PE PE
IT system 1 IT system 2
IT system 3IT system 4
G
G
G
G
Addr. 1
Addr. 2
Addr. 4
Addr. 3
IRDH275B
IRDH275B
IRDH275B
IRDH275B
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