Rockwell Automation 1440-VDRP06-00RH XM-160/161/162 Direct Vibration Module - Manual (Page 67)

Publication GMSI10-UM025C-EN-P - August 2010
Configuration Parameters 59
Boosts the supply voltage to IEPE power when the
module power supply voltage drops below 22V dc.
This parameter is intended for battery-powered
applications that experience low voltage situations
(down to 18V dc) with slow battery drain, and high
voltage situations (up to 32V dc) as the battery
charges.
Enable the IEPE Voltage Boost only when using IEPE
powered transducers with a module powered from a
24V battery system. Standard applications that use
an AC-powered 24V power supply should disable
this parameter.
Important: When IEPE Voltage Boost
is enabled, Auto Buffer Power is
automatically set to "Automatic," and
Buffer Power Type is automatically
set to "Positive." This means
negative-voltage transducers (e.g.
non-contact sensors) will not be
correctly represented at the buffered
outputs. Therefore, in applications
where the module is powered by a
24V battery system and uses
non-contact sensors, this parameter
should be disabled.
Note: This parameter setting applies
to all six channels.
Determines whether the buffer power is set
automatically by the XM module or manually by the
user.
The Buffer Power and Buffer Power Type settings
determine the internal power supply voltage
provided to the buffered output circuits. The buffered
output circuits are not capable of swinging the entire
-24V dc to +24V dc transducer input range. These
settings determine whether the outputs swing the
positive range (nominally +0.6V dc to +22.5V dc) or
the negative range (-22V dc to +3V dc).
When Buffer Power is set to "Automatic," the
module senses the DC bias voltage of each of the six
channels on power-up, and sets the power to
positive voltage or negative voltage depending on
the majority of the transducers. If there is an equal
number of positive and negative transducers (for
example, three positive and three negative), the
setting defaults to negative.
In applications where you want to use the buffered
outputs of a transducer that is in the minority, set
Buffer Power to "Manual" and configure the Buffer
Power Type setting. Note that buffer power
settings that do not correctly match input
transducers will not cause any damage to the
transducer or module. These buffers will simply
saturate and no useful signal will be obtained at
their respective outputs.
Important: This parameter is
automatically set to "Automatic" when
IEPE Voltage Boost is enabled. You
must disable IEPE Voltage Boost to
change the Auto Buffer Power setting.
Note: The Buffer Power settings take
approximately five seconds to activate
after downloading the configuration or
upon power-up. This delay allows the
DC Bias measurement to settle.
Note: This parameter setting applies
to all six channels.
IEPE Buffer Power and Signal Detection Parameters
Parameter Name Description Values/Comments
XM Configuration
Utility EDS File
Enable IEPE
Voltage Boost IEPE Voltage
Boost
XM Configuration
Utility EDS File
Check to Enable Automatic
Clear to Disable None
XM Configuration
Utility EDS File
Auto Buffer
Power Buffer
Power Mode
XM Configuration
Utility EDS File
Check means
Automatic Automatic
Clear means
Manual Manual