Hardy HI 1756-nDF - Manual (Page 51)

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Chapter 6
Chapter 6 Troubleshooting
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Chapter 6 provides procedures for troubleshooting the electrical, mechanical and
firmware elements of the HI 1756 nDF and for using Hardy’s Integrated Technician
(IT®) software utility to isolate problems. Flow charts provide troubleshooting
procedures for the dispenser/filler, load cells, and cabling.
Disassembly and Reassembly Notes, Warnings and Cautions
WARNING EXPLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT OR REPLACE
COMPONENTS UNLESS POWER HAS BEEN SWITCHED OFF OR AREA IS KNOWN
TO BE NON-HAZARDOUS.
Always replace broken or damaged modules or hardware immediately.
Always check to be sure that no loose parts are sitting on printed circuit boards
or electrical connectors or wires when disassembling or reassembling.
Always protect printed circuit boards from electrostatic discharge (ESD).
Always use approved ESD wrist straps and anti-static pads.
Always follow proper safety procedures when working on or around the Rate
Controller.
This chapter describes several tests that can shorten the time for troubleshooting. Most
problems require the use of two or more tests to determine the cause.
If a problem is isolated to a load cell, it may not mean the load cell is the damaged
component. Mechanical imbalances and system piping stress (lack of piping flexures,
pressure hoses draped over, pipes etc.) can make a load cell or weight controller seem to
be the problem.
If you are in doubt as to how to resolve a problem or if you need assistance, look for
Hardy Process Solutions Web-tech at http://www.hardysolutions.com. Web-tech is
updated often and is available 365 days a year 24/7. It contains frequently asked
questions to aid you in troubleshooting, and it provides a form for requesting additional
information and answers to questions, with no waiting on hold. Located under the
SUPPORT pull down, select the online support selection and then WebTech Knowledge
base.
Weight and Voltage Testing
This test section looks at the readings from ALL the load cells to test overall system
performance and signal voltage readings. This test works for a variety of load cell
connection systems.
Further investigation to isolate system problems requires the use of hand tools and multi-
meters or the Integrated Technician Summing Junction Box and using the IT© Test
section.
NOTE IT ®is a registered trademark of Hardy Process Solutions Inc.
Weight
This displays the amount of force seen by all load cells installed in the summing junction
box. Further investigation to isolate system problems will require the use of hand tools
and Multi-meters or the Integrated Summing Junction box and using the IT test section.
This force can show an imbalance or weight distribution problem. Review your system to