Diameter Calc - Parker 590+ DRV Product Manual

DIAMETER CALC.

This block performs three functions.
DIAMETER CALC:
TAPER CALC:
TENS+COMP CALC:
These three functions are combined into one function block as they are functionally closely
coupled.
DIAMETER CALC calculates the diameter of a reel as a function of the reel speed and the line
speed. The resulting diameter is a percentage of the maximum full roll diameter. A lead section,
adjacent line section, or surface driven speed sensing device is required to supply the line speed
signal. The winder or unwind drive's motor speed feedback provides the reel speed input.
The ratio of the minimum core diameter to the maximum roll diameter determines the operating
range of the diameter calculator. Set MIN DIAMETER to that ratio using the expression:
Minimum Core Outside Diameter
The magnitude of LINE SPEED is compared with MIN SPEED to determine when the diameter
calculator will operate:
•
When LINE SPEED is above MIN SPEED the calculator is on
•
When LINE SPEED is below MIN SPEED, DIAMETER is held at the last calculated
diameter
When EXTERNAL RESET is ENABLED, RESET VALUE is used as the diameter output.
NOTE
RAMP RATE adjusts the filtering of the diameter output. Its setting is the time it takes for a 100% change in DIAMETER. For example, at the default
setting of 5.0 seconds, a 50% step change in diameter would take 2.5 seconds for the output diameter output to display the change.
DC590+ DRV Series DC Digital Drive
Used to calculate roll diameters in winder applications.
Used to profile the tension demand with diameter.
Used to provide additional torque to compensate for static and dynamic
friction, as well as load inertia.
÷
Maximum Full Roll Diameter x 100%
In turret winder applications, LINE SPEED will usually be above MIN SPEED.
During roll changes, EXTERNAL RESET must be held ENABLED for the new
spindle until the web has been transferred and the diameter is calculated
properly. RESET VALUE must be set to the appropriate new core value for a rewind, or new roll diameter for an unwind.
D-41
Programming