Re: [TowerTalk] rotating tower or stack : rpm

[Al Kozakiewicz <akozak@hourglass.com>]

It wasn't clear why you were concerned.

Soft starts are common in industrial applications, though I can't recall ever 
seeing one used where the output of the reduction drive was 1 RPM!

That motor spec sheet shows an integral  mechanical softstart (i.e., a 
flywheel) as an option.  Otherwise the standard industrial devices are 
candidates. Honestly, soft starts on big motors are more used to limit inrush 
current than for any mechanical protection. They can be as expensive as a VFD 
or as simple as an inductor.

Al
AB2ZY


________________________________________
From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Richard Riley 
<Richard.Riley@tango.hr>
Sent: Wednesday, October 4, 2017 12:54 PM
To: 'towertalk@contesting.com'
Subject: [TowerTalk] rotating tower or stack : rpm

Hi guys,

my previous post (reference soft-start and frequency regulation of motor on a 
rotating tower) drew no responses :( :(...
...so I'll try it from another angle.  I'm about to erect 102ft of 20inch- to- 
a-side, triangular rotating tower (loaded with 12-15m boomed monobanders from 
40-10) on a 3 phase motor, with a projected speed of 1rpm..and am concerned 
about the potential for start/stop stress.

You have a large stack or a rotating tower.

How fast does it rotate?

Have you employed a soft-start-stop system to prevent mechanical shock?

If so, what did you choose?

Your input appreciated!

73 9a1tt

Richard Riley

mob: +385(0)993 994 995
direct: +385(0)1 5494 303


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