Function
20
isoLR275_D00127_00_M_XXEN/07.2018
2.4.7
ISOnet function (COM SETUP)
To activate this function, select "ISOnet=ON“ in the COM SETUP menu. This
function is a type of scanning function. The BMS master with activated ISOnet
function controls the ISOnet slave devices via the BMS bus. When the master
ISOMETER® has finished one measuring cycle, the authorisation for insulation
monitoring is passed on to the next higher BMS address. During the insulation
monitoring process, all other ISOMETER®s are in the STANDBY mode. In this
way it is prevented that ISOMETER®s influence each other in interconnected IT
systems. In comparison to a solution with coupling switches and function in-
put F1/F2, the response time will be extended because the measurement is
not permanently carried out. This has the advantage that no auxiliary contacts
of a coupling switch are required. Furthermore, this solution is recommended
for IT systems coupled via capacitances or diodes.
Each ISOnet slave checks the network for an ISOnet master. If no master exists,
the fault "ISOnet Master?" will be output on the display. With the ISOnet func-
tion activated, the function input F1/F2 is automatically deactivated.
