Electronic Schematic / Diagram devices
Electronic Schematic / Diagram devices
(OP)
I have a customer that continues to comment that I need to be showing my devices in the "alarmed" state on my control panel schematic. I have always understood that on schematics, devices were shown in the powered off / shelf state. Is there a standard / recommended practice / publication that defines this or is it just an understood thing?
Thanks,
Jeff
Thanks,
Jeff





RE: Electronic Schematic / Diagram devices
David Castor
www.cvoes.com
RE: Electronic Schematic / Diagram devices
Then again, it's a good exercise to consider such failure modes anyway.
Would the customer be happy if you provided a set of signal flow diagrams for the alarm conditions? Or are there too many to contemplate doing that?
RE: Electronic Schematic / Diagram devices
xnuke
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RE: Electronic Schematic / Diagram devices
By the way, what is an "alarm state" anyway? it's not that I can't ASS-u-me what it is, the point I am making is that as it is not an industry standard term, someone else may interpret that slightly differently, hence more risk for errors. That's why we have standards such as IEEE, IEC, NEMA/JIC, ANSI etc.
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RE: Electronic Schematic / Diagram devices
RE: Electronic Schematic / Diagram devices
I think that my customer may not exactly understand that they are only looking at a wiring schematic and not a trip logic diagram or alarm and trip diagram or anything else along those lines.
Thanks again,
Jeff
RE: Electronic Schematic / Diagram devices
Normally closed, and N.O. HELD closed are different symbols, and is still used as per the old JIC standard for device designation.
M.
RE: Electronic Schematic / Diagram devices
Jeff
RE: Electronic Schematic / Diagram devices
M.