CONTREX CX-1102 - Manual (Page 3)

Page 1
INTRODUCTION
The CX-1102 motion controller is used with various types of motor drives for precision control of unwind/
wind applications. The typical application consists of a web or line coming off of a powered unwind roll,
passing through a dancer loop and being taken up on a powered rewind roll. Both axis must have quadrature
(bidirectional) encoders either on the motor shaft or on the roll shaft. Generally both of the axis will be under
control of the CX-1102. It is possible, however, that one of these rolls will be under external control.
This guide is intended to assist with the start up of elementary unwind/wind systems. More involved
applications should be implemented only after the system is working as herein described. Refer to the CX-
1102 Technical Reference Manual for a comprehensive and detailed explanation of the CX-1102’s features
and operations.
The CX-1102 start-up procedure consists of:
• Basic Wiring
• Operator Interface Primer
• System Setup Procedure
The following assumptions are made:
• Except for the changes required here, the CX-1102, including its PLC, will be programmed as factory
default.
• The default tuning for the CX-1102 should be stable for most applications and will not be discussed
here.
• Quadrature sensors are required for all applications.
This information is useful (but not essential) to complete setup.
• Dancer Mechanical Design: The Dancer content is the length of web material stored in the dancer
between its empty and full positions. This storage must be at least equal to 0.5 seconds of web travel at
maximum Line Speed. The nominal operating point, or Dancer Setpoint, should position the dancer at
approximately mid-range between empty and full.
The length and angle of the dancer arm should result in a near linear relationship of dancer position vs
dancer content. Avoid high angles of dancer rotation, or severe angles of web entry or web exit paths.
The web tension is determined by the loading on the dancer arm, either by deadweight, or by
pneumatic cylinder. The CX-1102 attempts to maintain dancer position, and does not directly control
web tension.