Proportional gain (pressure), C.5.7 proportional gain (pressure) – Delta RMC101 User Manual
Page 838
RMC100 and RMCWin User Manual
C-68
Force on A Side = Pressure x Cross Section of Cylinder
Force on A Side at 20mA = 7500 psi x ( p x 3 inches x 3 inches )
Force on A Side at 20mA = 212,057.5 pounds
Force on B Side = Pressure x ( Cross Section of Cylinder - Cross Section of Rod )
Force on B Side at 20mA = 7500 psi x ( p x 3 inches x 3 inches - p x 1 inch x 1 inch)
Force on B Side at 20mA = 188,495.6 pounds
We assume that we will use forces up to 150,000 pounds. Because the RMC is limited in force
units from ±32,767, we cannot use pounds as our force units, but instead must use 10-pound
units. Therefore, 150,000 pounds will be represented as 15,000 force units.
Using this assumption, can calculate the scale.
Both are above 16383.5, so our Prescale Divisor must be 1 (the Prescale Divisor bits
will both be 0). Therefore, our scales are as follows:
Next, we must calculate the offsets for both channels. We use the following
equation:
Therefore, by using the first point (0 ten-pound units at 6500 counts or 4mA) for
both channels, we get the following:
C.5.7 Proportional Gain (Pressure)
Default: 1
Range: -32768 to 32767