I don't own US Tower product but have replaced tower limit switches several
times....these are fairly generic devices, and Square-D makes a ton of great
industrial switches, many different configurations, weather/environment
Their products are sold by all the big electrical suppliers, and often can
be found new/used on the auction sites, etc.
Depending on your tower mfgr/model, your switch may require 120VAC or low
voltage. Some are normally-open, some normally-closed altho I think most
tower applications use normally-closed loops.
Even the "weatherproof" switches will eventually get internal corrosion,
which of course will disrupt the switch's functioning. Sometimes the
internal contacts (and gaskets, etc.) can be cleaned up & replaced, other
times it just makes more sense to replace the switch.
Another thing, the switches use an "arm" to sense the position of the tower
sections. Sometimes these "arms" (they have a wheel on the end also) will
break or become misaligned, and if you are lucky, you switch will just need
If you want I can send you a few pix off-list as to how mine are
installed/interfaced (I have a Tri-Ex tower), and I may also have a few
spare switches which are surplus to my needs.
Let me know!
----- Original Message -----
From: "Ed Magnuson" <firstname.lastname@example.org>
Sent: Friday, January 07, 2011 11:08 AM
Subject: [TowerTalk] MCL-100 limit switches
> Since US Tower rarely divulges such information, can anyone who has the
> MCL-100 control box and limiting switches tell me who manufactures the
> switches and their part numbers? I seem to have a faulty upper limit
> that will need replacing.
> An electrician tried to realign it and get it working but could not do so.
> can move the tower down but not up, except when the electrician bypasses
> upper switch with a jumper in the control box.
> I have an HDX-555 and will keep it at 50-ft and not move it again until I
> can secure a replacement for the upper switch. I cannot read the info on
> switches because the labeling is too marred.
> Anyone out there with sharp eyes?
> Ed, W1MAG
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