ConnectionConnection
iso685-D-P_D00170_00_M_XXDE/06.2016
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6.10 Connection to the BB bus
The BB bus is an interface that enables Bender devices to communicate with each other.
The BB bus can be used with an ISOMETER® and one or more EDS44…-S. For this purpose,
the BB bus is installed at the rear side of both devices and afterwards, both devices are
mounted next to each other on the DIN rail. For further information, refer to the quick-
start guide enclosed to the BB bus PCBs.
Sensor variant devices that are additionally connected to the ISOMETER®
do not require additional supply voltage when the devices are connected
to the BB bus via X3.
A maximum of two EDS44…-S can be connected to an ISOMETER®.
When the BB bus is installed, the EDS44… must always be mounted on the
right side of the ISOMETER®. In addition, for protection against short cir-
cuits, a BB bus end bracket must be mounted to each first and last device
on the DIN rail featuring a BB bus.
6.11 Connecting the EDS to the ISOMETER®
Risk of malfunctions due to excessive locating current on sensitive
system parts!
The locating current flowing between the IT system and earth can cause
controller faults in sensitive parts of the system, such as the PLC or relay.
Ensure that the level of the locating current is compatible with the system
to be monitored.
Risk of incorrect measurement
The supplied locating current may influence other connected insulation
fault location systems. If they measure the injected locating current, the
measurement might be incorrect.
Insulation monitoring is deactivated
while the insulation fault location is active.
The EDS44…-S must be connected to the ISOMETER® via the BB bus.
The EDS44…-L must be connected to the ISOMETER® via the BS bus.
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