HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/2
GlennA
User Rank
Gold
Re: alarm or fault memory
GlennA   6/4/2012 9:46:44 AM
NO RATINGS
TJ McDermott;  Yes, too many alarm messages can also be a problem.  The ABB IRB 6400 S4c controller had several message lists, and a general list.  And some alarms would generate a secondary message, or even a tertiary message;  e.g. on a servo fault, each of the 6 axes would reply with a shutdown message.  It took some time to sort through the alarms to get to the primary error.

TJ McDermott
User Rank
Blogger
Re: alarm or fault memory
TJ McDermott   6/4/2012 9:40:24 AM
NO RATINGS
Alarm history is vital when there is more than a handful of alarms to track.  On the other hand, having a hundred alarms to sort through can be just as difficult as the intermittent one.

naperlou
User Rank
Blogger
Re: alarm or fault memory
naperlou   6/4/2012 9:34:17 AM
NO RATINGS
GlennA, I was working for a company that made simulators at one time.  I was involved in a R&D project to track errors and predict faults.  It was very interesting and an early application of AI in a real-time system.  We acutally logged every fault, even intermittent ones.  I learned about this working on satellites, actually.  Having an indicator that just blinked is not really useful, you need to keep that information.

GlennA
User Rank
Gold
alarm or fault memory
GlennA   6/4/2012 9:00:55 AM
NO RATINGS
Intermittent or momentary faults can be very hard to find.  On some machines, where possible, I added a latch to the alarm.  Other times, you just had to watch for the error.  One of the machines that I worked on had an air blow for spindle cleaning during tool change.  If the air pressure dropped below the switch setting the machine Emergency-Stopped on low air.  As soon as it stopped and shut off the air blow, the pressure built back up above the switch setting, and the error automatically reset .  Machine operators were notorious for not paying attention, so the complaint was usually "the machine just stopped".  Often the fix was just replacing the air supply hose with a shorter, larger diameter hose.

<<  <  Page 2/2


Partner Zone
Latest Analysis
Take a look at the top 20 US undergraduate engineering programs. Then tell us -- did your school make the cut?
Producing high-quality end-production metal parts with additive manufacturing for applications like aerospace and medical requires very tightly controlled processes and materials. New standards and guidelines for machines and processes, materials, and printed parts are underway from bodies such as ASTM International.
Engineers at the University of San Diego’s Jacobs School of Engineering have designed biobatteries on commercial tattoo paper, with an anode and cathode screen-printed on and modified to harvest energy from lactate in a person’s sweat.
A Silicon Valley company has made the biggest splash yet in the high-performance end of the electric car market, announcing an EV that zips from 0 to 60 mph in 3.4 seconds and costs $529,000.
The biggest robot swarm to date is made of 1,000 Kilobots, which can follow simple rules to autonomously assemble into predetermined shapes. Hardware and software are open-source.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 8 - 12, Get Ready for the New Internet: IPv6
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service