User's Manual

23
VIBCONNECT RF 11.2011
System description
What happens, if ...
... a sensor unit “wakes up” from its idle time?
• The sensor unit first checks whether the idle time has been
terminated based on the timer settings or due to an event
(time-controlled or event controlled operation). It then performs
the measurements, using the current measuring configuration,
and transfers the data via radio signal to the bridge. The bridge
confirms receipt of the data and sends a new measuring con-
figuration to the sensor unit, if this is required. Subsequently, the
sensor unit returns to idle mode.
... the radio channel is used by another sensor unit?
• The sensor unit waits for 2 seconds and then checks again
whether the radio channel is available.
... the power supply to the sensor unit has been temporarily inter-
rupted?
• When the sensor unit is switched off, the measuring configura-
tion data is lost. When the unit is switched on again, it automati-
cally requests a new configuration from the bridge. After this
configuration has been received, the required measurements are
performed and the data is sent to the bridge.
... a sensor unit is within the radio range of two bridges?
• Each sensor unit is assigned to one bridge in the OMNITREND
software. All requests sent by the sensor unit are only replied to
by this bridge.
... a sensor unit is installed in an existing radio cell?
• Before installing the sensor unit, you must locate the point
with the best radio reception. To do this, set the sensor unit to
commissioning mode to measure the reception field strength at
various possible locations of installation. Then install the sensors
on the machine, connect them to the sensor unit and start the
system. In a further step, configure the respective measuring
points in OMNITREND. The relevant measuring configuration
is then transmitted to the bridge with the best radio reception
field strength.