ndzied1
Lifetime Supporting Member
OT: Blast from the Past!
- Thread starter ndzied1
- Start date
controlled
Lifetime Supporting Member
Wow this is the first time I’ve seen one of these.
Just curious what’s that limit switch on the right do?
I would guess nothing, since it has its arm tied off.
OkiePC
Lifetime Supporting Member
Adam303 said:
I replaced about 72 of those things used on tire building machines with SLC ... talk about a PITA. I was glad to see the last one land in the dumpster.
WAG: with it tied down, lets you open the door without killing control power?Adam303 said:Just curious what’s that limit switch on the right do?
Mickey
Lifetime Supporting Member
Funny, door interlocks were one the first things to get by-passed. Along with door mounted horns (buzzers)
ndzied1
Lifetime Supporting Member
OP
Just curious what’s that limit switch on the right do?
I suppose it could get you a nice citation letter from your friendly neighborhood OSHA inspector.
ndzied1
Lifetime Supporting Member
OP
Actually we are overhauling the machine for a customer and will be replacing the drum with a PLC.
The newest thing on it (by about 25 years) is the Arc Flash warning sticker. I thought that was a nice compliment to the tied off door switch.
There are plenty of goodies on it. I'll try to post pictures of interesting old components as we dismantle the thing. We will replace it but I bet the 10 HP U-Frame motor would run for another 50 years easy with a little bearing maintenance.
Eric Nelson
Lifetime Supporting Member + Moderator
I'm guessing it prevents the machine from running with the cover off, or at least it USED TO!...Wow this is the first time I’ve seen one of these.
Just curious what’s that limit switch on the right do?
I've never seem this style sequencer. We used to use the old Gemco cam switches for machine control. I got pretty good at adjusting them while running with that toothed plastic 'adjustment stick'. My very first PLC project was replacing a Gemco switch with an Omron C20K. Of course, I used the FUN(61) 'drum counter' instruction...
-Eric
TConnolly
Lifetime Supporting Member
I'm guessing it prevents the machine from running with the cover off, or at least it USED TO!...
No, no, no, no. Its to keep tension on that wire wrapped around its roller arm.
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