Rockwell Automation 1395 Digital Reference Adapter for RTP Applications - Manual (Page 13)

Publication 1395-RTP-5.2 - September 1997
Chapter
2
Hardware Description
Chapter Content Chapter 2 contains a general description of the major hardware
components of the Digital Reference Adapter Board. It is not
intended to be an all encompassing technical description of each
hardware component. This chapter provides basic information to
assist the reader in:
• Identifying the Digital Reference Adapter Board input
configuration
• Understanding the hardware requirements necessary to
interface the Digital Reference Adapter Board with
peripheral devices.
Board Function The Digital Reference Board connects directly to the Main Control
Board using Port A of the Microbus Interface for the RTP Unwind
Drive application (Figure 2-1). This interface supplies the Adapter
Board with all logic voltages and communication capabilities. All
user connections to the board are made at Terminal Block TB-3
located at the bottom of the 1395 Drive. The primary functions of the
board are to:
• Provide an interface for the digital reference input which
provides the Drive with a properly scaled and offset speed
reference proportional to the press speed of the RTP Unwind
Drive application.
• Provide an interface for the Dancer potentiometer which
provides the Drive with a process trim input. This input will
indirectly control the tension of the RTP Unwind Drive
application, by controlling the position of the dancer roll.
Dancer trim has a normal trim speed gain of ±2% of the
maximum speed reference (or ±35 RPM).
• Provide the internal, off line, programmable, digital logic
which interprets the inputs of the 9 digital input logic signals,
as well as the position of the Dancer potentiometer. This
places the Drive into defined modes of operation by
communicating with the Drive Main Control Board. The
defined modes or states are explained in detail in Chapter 3.