Delta RMC151 User Manual download pdf (Page 36)

RMC70/150 and RMCTools User Manual

Method 2: P0/P1 Calculation

The accuracy of this method depends on how accurately you can measure the pressure of

the axis.

1. Physically measure two different pressures of the axis and record the value of the

Voltage register at each point. (The difference between the two pressure should be as

large as possible). Call the smaller measured pressure P

, and its corresponding

Voltage V

. Call the greater measured pressure P

, and its corresponding Voltage V

2. Calculate the Pressure Scale with the following equation:

Pressure Scale = (P

-P

)/(V

-V

)

If the Pressure Scale is negative, ignore the minus sign. RMCTools accepts only a

positive Scale.

3. Calculate the Pressure Offset with the following equation:

Pressure Offset = P

- Pressure Scale x V

Scaling Dual-Input (Differential) Force

Dual-Input Force requires two pressure transducers. Each pressure transducer must be

individually scaled. The RMC calculates the Actual Differential Force every control-loop

using the following formulas:

Actual Force A = (Channel A Voltage (or Current) x Force A Scale) + Force A Offset

Actual Force B = (Channel B Voltage (or Current) x Force B Scale) + Force B Offset

Actual Differential Force = Actual Force A - Actual Force B

To correctly scale the axis for your particular application, use the method below to find the

A and B Force Scale and Force Offset parameters.

Method: Use Transducer Specifications

This method assumes the two pressure transducers or load cells provide zero volts at zero

pressure or force.

• From the transducer data sheet, find the maximum output voltage of your pressure

transducer and the pressure at that voltage.

• Calculate the area of the A side (cap end) of the piston.

• Multiply the area of the A side with the maximum pressure of the A transducer to get

the maximum A force.

• Calculate the Force A Scale with the following formula:

Force A Scale = maximum A force / Max A Voltage

• Calculate the effective area of the B side (rod end) of the piston. This is the area of the

cylinder minus the area of the rod.

• Multiply the area of the B side with the maximum pressure of the B transducer to get

the maximum B force.

• Calculate the Force B Scale with the following formula:

Force B Scale = maximum B force / Max B Voltage

• Make sure the system has 0 force and then record the value of the Channel A

Actual Force (to find this register, in Axis Status Registers pane, click the All tab,

and expand the Pressure/Force Feedback section). Negate the value and enter it

as the Force A Offset.

2.2.6. MDT Scaling

16 Delta Computer Systems, Inc.

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