Rockwell Automation 9329 Drive Application Software - Manual (Page 13)

FM – Diameter Calculation
Drive Application Software – page 13 of 30
4.3.11 DiamPresetVal_in
This return parameter is used as the value to preset the diameter calculation when
the DiamPresetCmmd is high.
Usage - The tag entered in the DiamPreset JSR instruction for this return parameter
should be entered as an input parameter to the DiamCalc JSR instruction.
4.4 DiamCalc routine
The diameter calculation routine is the heart of this function module. The routine includes
programming for the diameter calculator, programming to scale an external measurement of
diameter, and scaled outputs for referencing to the drive and to other function modules. The
module has been configured for operation in Imperial units. All data must be entered in the
units specified by the tags. If the line speed is not directly available in FPM, the user must
scale the line speed reference to FPM. The programming for this may be entered in the main
routine and should be executed before the JSR instruction for the DiamCalc routine.
Example equations for converting the line speed reference to FPM are below.
Note: The change in diameter or actual roll diameter should not be used in the calculation of
Line Speed. The Line Speed input parameter (DiamCalc routine – In4) must be an
independent source of line speed, not the spindle rotational speed converted to line speed
(using the calculated diameter).
Typically, line speed reference is used for the diameter calculator line speed input. If the line
speed reference is not available, a line speed feedback signal from an adjacent fixed
diameter drive or a surface tachometer can also be used.
The externally measured diameter may be used for the calculated diameter output. It is
recommended to utilize the Diameter Calculation FM when measuring the actual diameter
with an external device. Using the FM will provide rate of change limits to prevent step
changes in the diameter or errors in the external measurement device from instantaneously
changing the output diameter value used in the speed reference to the machine section. If
the measured diameter output, scaled in inches, is programmed as one of the three preset
inputs, the measured diameter can be used as a preset.
) eSpeed(Mpm 3.2804*Lin Fpm) LineSpeed(
peed(Yph) 0.05*LineS Fpm) LineSpeed(
d(Ypm) 3*LineSpee Fpm) LineSpeed(
n/min) ineSpeed(i 0.083333*L Fpm) LineSpeed(
12
m(in)*p MinCoreDia
*
GearRatio
tr(Rpm) LineSpeedM
Fpm) LineSpeed(
=
=
=
=
=