Nexen RSD250 964260 - Manual (Page 4)

FORM NO. L-21179-D-1108 4
INTRODUCTION
The Nexen RSD250 Unwind Dancer Package consists of all the essential components necessary for state-of-the-art
dancer arm control. This system is designed for unwind applications using a pneumatic brake. Included in the kit is a
RSD250 controller, DPS60A dancer arm position sensor, EN50 pressure converter, air supply filters, and air line tub-
ing. The RSD250 controller is housed inside an enclosure that only requires 120 or 240 VAC service to be wired in. All
DPS60A, EN50, and external signal connections are made to the RSD250 via pre-wired connectors. Additionally, all
the pneumatic connections are made using tool-less quick connect fittings; thus connecting components together is fast
and easy with little chance of error.
This system has been pre-configured for unwinding applications using pneumatic brakes. Essential setup parameters are
set so only the DPS60 must be calibrated and the proper Start/Stopped signal selected by the installer. After the instal-
lation is complete, the RSD250 is tuned to the application using two potentiometers located on the main control board.
Other setup and tuning parameters may need to be adjusted to accommodate more demanding applications and the RSD
Communications Kit (See Part Numbers Section) can be purchased separately and used to adjust all parameters.
RSD250 OvERvIEw
As a roll changes diameter, a dancer control must adapt to the corresponding changes in speed, inertia and torque if high
dancer performance is desired. High dancer performance not only ensures constant tension, it allows for faster machine
accelerations and decelerations, which means more production on many machines.
The RSD250 is a truly adaptive controller and will adapt its response to changing roll diameter and inertia condi-
tions. This ensures that the RSD250 will always provide the right amount of action for stable dancer arm performance.
Other benefits: 1) Diameter sensing is not necessary
2) Splicing different size rolls without readjustment
3) Excellent performance at slow web speeds and on small rolls.
INSTALLATION
For installation instructions for the EN50 and DPS60A refer to their maintenance manuals (included with this kit).
CAUTION
Mount all the RSD250 Basic Dancer Kit components in a shock and vibration free area with an
ambient temperature of less than 140°F [60°C] and more than 32°F [0°C].