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itsmoked

itsmoked

Electrical
Feb 18, 2005
19,114
As I'm working through the bazillion parameter settings of this VFD in front of me I come to this note, maybe 200 pages in to the manual, referring to parameter 00-02 everyone sets when they come to it and it's on the very first page of the parameters.


Death_gx1jde.jpg



27wrprp.gif


Keith Cress
kcress -
 
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I recall a chemist writing about a procedure which seemed simple enough. It was a few dozen steps and he looked at the required chemicals and felt from the first steps it was something he could do.

So he adds this, mixes that, and so on. He said it was a process certain to produce noxious odors so it was with the fume hood nearly closed with just enough room for his arms to reach under.

Goes along to the final step - "Add this stuff" - which he does. A moment later glass shards are blown in a fan pattern from the opening of the hood. Fortunately, no injury, but a mess to clean up. Afterwards he's looking at the procedure to find what went wrong and realizes that "Add this stuff" did not have a "." at the end. He turns the page to find one word: "slowly."

Anyway - it's good you avoided death or serious injury, little thanks to the creators of that procedure.
 
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Didn't you ever have that "exercise" in school where you got a sheet of instructions to do all sorts of things, but the first instruction was to read all instructions before doing anything and then the final instruction said to simply put your name on the paper and turn it in without doing any of the other things?

I’ll see your silver lining and raise you two black clouds. - Protection Operations
 
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I spent a few years writing manuals for VFDs and often re-writing manuals that had been written in Taiwan or Korea, then translated directly into English. I wish I could remember all of the hilarious juxtapositions of instructions in those translated ones. One that I do remember though was that the drive in question had a "disable" input that came from the factory with a jumper installed, so if you wanted an external disable command, you removed the jumper and wired a Normally Closed contact to it. In the translated manual, that information was not shown or discussed until you got to the Troubleshooting Section in the back, under "Why will not the drive run?" as one of the possibilities, yet not even the first one! I moved it up to the beginning under a "Things you must know before starting to wire and program this drive" section.

I can assure you that instruction on the parameter programming was the result of some unfortunate learned experience after the manual was originally written, so they slipped it in somewhere they though appropriate.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
 
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Funny you should mention that Jeff. For a quickie 'does the motor turn' I cancelled "external control" back to "keyboard" and was immediately whacked with the "STO" error (Safe Torque Off) since there was no STO1 or STO2 jumpers.

Keith Cress
kcress -
 
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Buy a snowblower and find this warning on page 1-
"Do not use the snowblower on the roof".

Brad Waybright

The more you know, the more you know you don't know.
 
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In college I had a Fiat. I commuted 3 hours on the freeway to school whenever I came home. One day I was reading the owner's manual, it stated "Do not drive continuously above 50 MPH". Sheesh.

Keith Cress
kcress -
 
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Did they define "continuous"? For the purposes of the NEC your 3 hours was right on the cusp.

I’ll see your silver lining and raise you two black clouds. - Protection Operations
 
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Might be it. I do recall one trip the passenger window crank knob breaking and falling down to roll across the floor - no one even in the passenger seat. The next trip the thermostatic temp switch that controlled the electric radiator fan failed somewhere around Dixon (immediately next to no-where). I cut the wires to it and twisted them together and was back in business..

Keith Cress
kcress -
 
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"Around Dixon" Nothing good starts off that way...

I’ll see your silver lining and raise you two black clouds. - Protection Operations
 
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