Nexen RSTC1100 964528 - Manual (Page 4)

FORM NO. L-21204-C-0908 4
INTRODUCTION
Nexen RSTC Tension Controllers are used to control web tension, relying on load cell based tension sensors to measure
web tension. As a part of a tension control system, the RSTC measures the web’s tension and corrects tension errors
by sending a signal to change the torque output of brakes, clutches, and motor drive systems. The RSTC automatically
adapts to changes in inertia and torque as roll diameters change. This ensures constant/stable tension at all times and
allows for faster accelerations and decelerations for a more productive web machine. The RSTC does not require a
diameter sensor for constant tension applications and can adapt to spliced rolls of different diameters automatically
without readjustment.
Applications for the RSTC include unwinding, mid process, constant tension winding, and taper tension winding.
RSTC1000 SYSTEM
The RSTC1000 Tension Control System includes three components: the RSTC1000, RSTC Operator Panel (ROP), and
RSTC Communications Software. The RSTC1000 tension controller can be used as a slave on a Modbus RTU network.
Because of this capability, many Human Machine Interfaces (HMIs) and Programmable Logic Controllers (PLCs) can
communicate directly with it. Web machines that already have a capatible HMI control panel do not require the ROP.
The Communications Software features setup, tuning and diagnostics functions and is available from the Nexen website:
www.nexengroup.com.
RSTC1100 SYSTEM
The RSTC1100 Tension Control System includes two components: the RSTC1100 and RSTC Communications Software.
The RSTC1100 tension controller can be used as a slave on a Profi bus DP network. Because of this capability, many
Human Machine Interfaces (HMIs) and Programmable Logic Controllers (PLCs) can communicate directly with it. The
Communications Software features setup, tuning, and diagnostics functions and is available from the Nexen website:
www.nexengroup.com.
MOUNTING
The RSTC is designed to mount inside the machine’s control cabinet alongside other controllers, PLCs, relays, etc. Small
size and its DIN rail mounting capability make installation fast and easy. Pluggable connectors simplify wiring as they can
be removed for convenient access to terminals. Only requiring a commonly available 24 VDC supply, the RSTC requires
no hazardous voltages.
Figure 1