Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 161
Measurement Definition Chapter 4
Example S.I. units:
Example Imperial units:
Compressors
A compressor normally “Thrusts” toward the suction end of the machine,
which is often at the non-drive end, and the thrust bearing is also typically
installed at this location.
In this situation, the direction of normal thrust is TOWARD the probes.
The normal practice is again to set the rotor against the active pads and use it as
the zero position, adjusting the probe gap to -10 V DC. This value is equivalent
to 1.27 mm (50mils), for a probe sensitivity of 7.87 V/mm (200mv/mill).
The offset value is entered as 10V DC in this example when using the Volts
selection, or 1.27 mm (50 mils) when using the EU selection. This assumes a
probe sensitivity of 7.87 V/mm (200 mv/mil). The sense control is set to
Toward. This setup also means that movement toward the active pads results in
decreasingly negative gap voltage. The minus sign for the Volts selection is
included in the AOP for simplicity but can also be added during configuration.
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