Craigslist deals

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Jeff Pack
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Re: Craigslist deals

Post by Jeff Pack » Thu Aug 07, 2014 10:27 am

Desert Diver wrote:
Jeff Pack wrote:Only downside, is when you slow'm down too much , heat builds up in the motor, and the VFD will shut it down.


Jeff, I never noticed this thread had continued till right now. The reason the VFD shuts down when you slow a motor too quickly is because when you reduce the frequency the motor is generating back onto the DC buss of the VFD and most VFD's have no way to put that power back to the incoming line. When the DC bus voltage goes too high the VFD shuts down to protect itself. Most VFD's have a place to hook up resistors so the waste power from slowing down the motor can be shunted to the resistor bank. I have this setup on my small lathe, and have put them on sawmill VFD's. I can set the deceleration time on my small lathe to 1/2 second and it stops like you hit it in the head. In one of the sawmill applications a log running at speed in the same direction as the chipping heads and saws cutting on it could be braked rapidly any time the heads or saws started to go overcurrent. I put overcurrent sensors to protect the resistor banks but have never tripped them and the motors seem to deal with it very well.

Brian


I'm not talking about stop, I'm talking about running them too slow. My stop is set super fast , and works great. Cranking motor speed down too far, and amp draw goes way up, and VFD gets unhappy.
=============================================

- I got a good squirt in my mouth
- I would imagine that there would be a large amount of involuntary gagging
- I don't know about you but I'm not into swallowing it

CCR discussion on Caustic Cocktails.

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Desert Diver
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Re: Craigslist deals

Post by Desert Diver » Thu Aug 07, 2014 10:45 am

True story. If you have a load that decreases with speed you can get away with 10-15hz but VFD's are not really replacements for gearboxes. They work best set up to run things overspeed. I have run 1800 rpm gearmotors at 5400 rpm for a particular purpose and you get better motor cooling and lower amperage so long as load doesn't go too high with the additional speed. For really low speed running you can put external fans on the motor and adjust the volts/hertz curve to match the motor better.

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Jeff Pack
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Re: Craigslist deals

Post by Jeff Pack » Wed Aug 20, 2014 11:23 am

=============================================

- I got a good squirt in my mouth
- I would imagine that there would be a large amount of involuntary gagging
- I don't know about you but I'm not into swallowing it

CCR discussion on Caustic Cocktails.

fljamis
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Re: Craigslist deals

Post by fljamis » Mon Oct 20, 2014 11:43 pm


fljamis
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Re: Craigslist deals

Post by fljamis » Mon Nov 03, 2014 4:48 pm


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renoun
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Re: Craigslist deals

Post by renoun » Tue Nov 04, 2014 11:01 pm

"Just to be clear, doing the Diamond Knot requires at the minimum double IPAs to be DIR." - MattleyCrue
"Mmmm....... Oreos!
They didn't look too good when I was spitting in my mask for dive #2!" - cardiver

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Jeff Pack
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Re: Craigslist deals

Post by Jeff Pack » Tue Dec 16, 2014 6:38 pm

=============================================

- I got a good squirt in my mouth
- I would imagine that there would be a large amount of involuntary gagging
- I don't know about you but I'm not into swallowing it

CCR discussion on Caustic Cocktails.

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ljjames
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Re: Craigslist deals

Post by ljjames » Sun Dec 21, 2014 11:03 pm

Saw this on CL, these are great lights, I have a set that I use all the time...

http://seattle.craigslist.org/skc/pho/4792540587.html
----
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KneeDeep
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Re: Craigslist deals

Post by KneeDeep » Fri Dec 26, 2014 12:16 pm

Any one looking for XXL OMS fins (I love mine)

http://seattle.craigslist.org/see/spo/4816748028.html
The ocean is a lousy teacher. First you get a test, then the lesson.

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geo
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Re: Craigslist deals

Post by geo » Fri Jan 02, 2015 12:12 pm


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Gdog
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Re: Craigslist deals

Post by Gdog » Mon Feb 09, 2015 10:43 pm


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finnegankp
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Re: Craigslist deals

Post by finnegankp » Mon Mar 02, 2015 11:15 am

http://seattle.craigslist.org/est/spo/4913953535.html

Oceanic Excursion BCD - Well Maintained w/warranty $350 obo
To dive? Or not to dive?... the latter is irrelevant! Get in the water!

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ryjoph89
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Re: Craigslist deals

Post by ryjoph89 » Sat Mar 14, 2015 10:24 am

http://seattle.craigslist.org/sno/spo/4931828566.html

Selling a bunch of extra/unused gear that's been sitting around for too long...
Manifold, argon straps, bands, SMB, lift bag, strobe, cave reel, camera, Dive Alert, plus misc extras

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SealScott
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Re: Craigslist deals

Post by SealScott » Sun Apr 19, 2015 10:53 am

http://seattle.craigslist.org/see/spo/4985787579.html

2 - Faber steel LP80's (+ rated, 2014 hyrdo)
2 - Faber steel LP 95

I messaged with the seller this morning - great guy and willing to answer questions.

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Norris
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Craigslist deals LOT OF TECH GEAR

Post by Norris » Tue Apr 21, 2015 9:27 am

Looks like a pretty decent hit, and for 3500 it might be worth it


http://seattle.craigslist.org/tac/for/4973745166.html
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Norris
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Re: Craigslist deals

Post by Norris » Wed May 27, 2015 3:45 pm

mmmm Scuba diving gear and only 700.00

http://seattle.craigslist.org/tac/spo/5045257088.html
**Pinch it, don't stick your finger through. You're just pinching a bigger hole.
CAPTNJACK - 2012**

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Gdog
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Re: Craigslist deals

Post by Gdog » Sun Jun 07, 2015 1:50 pm


KneeDeep
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Re: Craigslist deals

Post by KneeDeep » Wed Jun 10, 2015 8:32 am



Wow.. that's a great price for 119's
The ocean is a lousy teacher. First you get a test, then the lesson.

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Gdog
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Re: Craigslist deals

Post by Gdog » Tue Jul 14, 2015 7:11 pm


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mpenders
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Re: Craigslist deals

Post by mpenders » Thu Sep 03, 2015 11:04 am

Anyone need a Scooby?

Scooby.PNG

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bradmond
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Re: Craigslist deals

Post by bradmond » Fri Sep 04, 2015 12:54 am

just bought 2, thanks Mike

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60south
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Re: Craigslist deals

Post by 60south » Thu Oct 01, 2015 7:07 am

$20000 for a turn-key dive training operation (a trailer with all the goodies). Not sure if this is a good deal, just thought it was kind of amazing.

http://denver.craigslist.org/bfs/5232636926.html

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Gdog
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Re: Craigslist deals

Post by Gdog » Thu Oct 01, 2015 8:00 am

Wow... That is actually quite impressive. In spite of the crappy oceanic tropical bcds. Well organized and thought out.

kundalinichi
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Re: Craigslist deals

Post by kundalinichi » Sun Oct 18, 2015 11:05 am



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