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6-88
Programming Your Application
590+ Series DC Digital Converter
TAPER CALC.
Use this block to profile the tension demand
with diameter.
This block is ignored by the drive unless
SYSTEM::CONFIGURE I/O::BLOCK
DIAGRAM::TAPER is connected to a non-
zero tag.
The function block uses two inputs, tension setpoint and taper setpoint, to create the tension
demand. The operator usually controls these setpoints.
Taper is a common requirement for winders. It reduces the tension as the roll diameter
increases.
A profiler adjusts the tension using the equation:
¿
¾
½
¯
®
u
u
Diameter
Min
Diameter
Diameter
Taper
100%
Spt
Tension
Demand
Tapered
to yield a hyperbolic taper output. MIN DIAMETER and DIAMETER are linked internally to
the DIAMETER CALC function block. The taper tension characteristics are shown below:
Tension
Min
Diameter
100%
Diameter
-100% Taper
100% Taper
0% Taper
Torque
Min
Diameter
100%
Diameter
-100% Taper
0% Taper
100% Taper
The result is multiplied by TENSION SPT. to get TAPER DEMAND. When the taper setpoint
is at 100%, the motor produces constant torque. That is, a constant torque from core to full
roll, and the tension falls off as the roll builds.
TENSION TRIM allows the tension demand to be adjusted, for example, when using closed
loop trim. The result is TOT. TENS DEMAND.
MMI Menu Map
1
SETUP PARAMETERS
2
SPECIAL BLOCKS
3
TAPER CALC.
TAPER
TENSION SPT.
TAPERED DEMAND
TENSION TRIM
TOT.TENS.DEMAND
Taper Calc.
TAPERED DEMAND
[452]
–
0.00 %
TOT. TENS DEMAND
[441]
–
0.00 %
0.00 %
–
[438] TAPER
0.00 %
–
[439] TENSION SPT.
0.00 %
–
[440] TENSION TRIM