Delta RMC101 User Manual download pdf (Page 559)

100

101

Analog 6.1

Transducer Interface Modules 6-15

type.

Step 3: Set the Scale A and Offset A Parameters for the Pressure Inputs

Refer to the individual field sections for details on setting these parameters.

Analog Input Ranges

See the COUNTS topic for detailed information on the maximum and minimum limits of the

various analog input ranges.

See also:

Analog Transducer Overview

Analog Transducer Wiring

Analog Transducer Configuration

Using Analog Channels as Position Inputs

Using Analog Channels as Velocity Inputs

Using Analog Channels as Differential Force Inputs

6.1.7.4 Using Analog Channels as Differential Force Inputs

Differential force control uses two separate analog channels as pressure inputs to generate one

force reading. Both inputs are scaled to forces, and then one is subtracted from the other, giving

a final differential force.

Notice that force and pressure are not interchangeable terms. This is because it is only

acceptable to subtract pressures if the surface areas acted on by the pressure are equal. In a

typical hydraulic cylinder with a single-ended rod, this is never the case because the rod takes up

part of the surface area on one side of the cylinder.

Analog channels may be configured to be used as one of two differential force input types. Both

require the Pressure Control firmware option:

• Differential Force Control

Two pressure inputs are used with the corresponding drive output (in this mode, analog modules

without drive outputs cannot be used for pressure control) for closed-loop, differential-force

control. See Controlling Solely Position, Pressure, or Force for details.

• Auxiliary Differential Force

The inputs do not have their own drive output. However, differential force control is achieved by

sharing a drive output of another input. This is used in applications where an axis switches

between closed-loop position control and closed-loop differential-force control. See Transitioning

from Position to Auxiliary Pressure/Force Control for details.

The following general steps are necessary for setting up differential force inputs:

Step 1: Assign Analog Channels to be an Differential Force Input

To assign a pair of analog channels to be a differential-force input, do the following:

1 2 ... 554 555 556 557 558 559 560 561 562 563 564 ... 950 951

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Delta RMC101 User Manual Page 559

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