Delta RMC101 User Manual download pdf (Page 92)

100

101

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

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