Hardy HI 1756-FC - Manual (Page 6)

Chapter 1 Overview
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This manual provides users and service personnel with specifications and procedures for
installing, configuring, operating, maintaining, and troubleshooting the Hardy
Instruments HI 1756 FC Rate Controller with WAVERSAVER.®
NOTE WAVERSAVER is a registered trademark of Hardy Instruments, Inc.
To ensure good performance and maximum service life, follow all guidelines described
in this manual. Be sure you understand all cautions, warnings, and safety procedures. If
you find that the information in this manual does not provide the help you need, contact
the HI Customer Service Department at:
Phone: (858) 278-2900
FAX: (858) 278-6700
Web Site: www.hardyinst.com
Support e-mail address: [email protected]
About Hardy Manuals
An overview of each chapter’s contents is listed below:
 Chapter One - Provides an overview of HI 1756 FC capabilities and features
 Chapter Two - Provides a overview of HI 1756 FC specifications
 Chapter Three - Describes the steps for installing both the standard and optional HI
1756 FC equipment and the HI 215IT series junction box
 Chapter Four - Explains how to configure the HI 1756 FC
 Chapter Five - Provides calibration instructions
 Chapter Six –
Provides troubleshooting procedures for repair of the HI 1756 FC
HI 1756 FC Overview
The HI 1756-FC module is a self-contained, microprocessor-based ControlLogix I/O
module. Its control inputs and outputs will easily plug into the backplane of an Allen-
Bradley ControlLogix programmable controller and/or remote rack. The remote rack
module is connected to the local chassis via a ControlNet link.
The analog-to-digital converter in the weigh module controller updates 100 times per
second and is capable of 8,388,608 counts of resolution. This allows the instrument to
tolerate large “dead” loads, over sizing of load cells/sensors, and still have sufficient
resolution to provide accurate weight measurement and control.
The module supports both C2 electronic calibration and hard calibration (i.e., traditional
calibration with weights).
The HI 1756 FC is a loss-in-weight controller that measures the flow rate from a feeding
device located on a process weighing scale. The user enters the flow parameters, and an
HI 1756 FC algorithm automatically calculates and adjusts the tuning parameters needed
to maintain the desired rate. After comparing the desired flow rate to the actual flow rate
(measured by calculating the loss of weight over short intervals), it computes the
adjustments needed to achieve the desired rate and transmits signals to adjust the speed of
the feeding device.
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Chapter 1 ●
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