Application Macros; Chapter Overview; Overview Of Macros; Dancer Macro - ABB ACS800 Series Firmware Manual

Application macros

Chapter overview

This chapter describes the intended use, operation and the default control
connections of the standard application macros.

Overview of macros

Application macros are preprogrammed parameter sets. While starting up the drive,
the user can select one of the macros with parameter 99.02.
There are five standard macros and two user macros.

Dancer macro

The purpose of dancer regulation is to control the surface web tension as material is
wound or unwound by regulating dancer position. This is achieved using dancer
position feedback. The dancer is loaded from either an external source controlled by
the customer or an analog output of the drive to produce tension on the web. When
using the dancer setpoint functionality of the drive, a 0(4) ...20 mA analog output
signal is used in conjunction with an I-P (Analog Pressure Regulator) Regulator to
produce the desired amount of web tension. Web tension variations are absorbed by
the dancer and cause the position of the dancer to change. The difference in dancer
position feedback and the dancer position setpoint (Max Dancer Travel center point
plus any offset) allow the dancer PI regulator to develop the error correction needed
to return the dancer to the setpoint position by trimming the speed of the section.
The P-Gain of the dancer regulator is adaptive for roll diameter changes. As the
diameter of the roll increases, the P-Gain can be set to increase from a min.
P-gain at core diameter to a max. P-gain at full roll. If the adaptive P-gain is not
desired, the min. and max. parameters can be set the same.
The setpoint position for the dancer is defaulted
to the center of the total dancer movement. The
regulation position can be adjusted by the
customer via a parameter. The dancer PI
regulator is updated every 10 ms to produce very
responsive trim. This allows for very stable
dancer position control over the entire speed
range.
A beneficial feature of a dancer is web storage, which acts like an accumulator to
absorb and isolate tension disturbances.
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Fixed Idlers
Fixed Idlers
Movable Idler
Movable Idler
"Dancer"
"Dancer"
Application macros