Bender ISOMETER IRDH275 Handbuch Seite 119

Function
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 ISOMETERs
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 sys-
tems 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 hour. Additionally, the LED for device errors
lights and the Relay K2 switches. When the ISOnet function is activated, the
function input F1/F2 will be disconnected.
27
IRDH275_D00122_03_M_XXEN/05.2017