Delta RMC101 User Manual
Page 92
RMC100 and RMCWin User Manual
3-42
Because the surface areas on either side of the piston are equal, the scales and offsets
will be equal for each pair.
Hydraulic Motor
In this configuration, the conversion from pressure to force can take many forms, since
the pressure is converted to torque, which exerts a force on the system. Therefore,
instead of a differential force being computed, a differential pressure is computed.
• Cylinder Dimensions: If your actuator is a hydraulic cylinder, then you will need to enter the
cylinder's inside diameter and the rod's diameter. These values are necessary to convert the
pressures read by each pressure gauge to forces by multiplying by the surface areas on
each side of the piston.
• Desired Force/Pressure Direction: The difference force is computed by A - B, where A is
the force computed from the first channel in the differential pair (channel 0 or 2), and the B is
the force computed from the second channel in the differential pair (channel 1 or 3). As a
result, the differential force will increase when Force A increases with respect to Force B.
This is typically how applications are set up. In this case you should select the first Force
Direction option in the calibration tool.
However, in some applications, the differential force should increase when Force B increases
with respect to Force A. In this case, you should select the second option. This will negate
both forces (since -A - -B = B - A), so you will see Force A and Force B displayed as negative
values, but the differential force should be correct.
• Desired Force/Pressure Units: This calibration tool is set up to easily allow you to have
your force displayed in any of seven precisions (1000, 100, 10, 1, 0.1, 0.01, 0.001) of several
common force units: pounds, Newtons, kilograms, metric tons (1000 kg), short (US) tons
(2000 lb), long (UK) tons (2240 lb). In addition, you can manually enter a value in terms of
any of the above units by selecting a base unit, and entering a conversion factor instead of
selecting one of the powers of ten. See step 5 below for further details on using this section
of the calibration tool.
2. Place the cursor in a field under the differential force axis you wish to calibrate.
3. On the Tools menu, click Scale/Offset Calibration.
4. Enter the above pieces of information.
5. Review the values displayed in the Resultant Force/Pressure area. This area shows the
maximum forces, or pressures for hydraulic motors, that can be read from either channel. The
values in Force Units are what will be used by the RMC and displayed in RMCWin. Notice that
they cannot exceed 32,500 units. Displayed below each value in RMC Force Units is the
equivalent value in the engineering units selected in the Desired Force/Pressure Units area.
If the maximum forces in RMC Force Units are both below 3,250, then you may want to decrease