[GreenKeys] Teletype Model 15 power Q's...

[COURYHOUSE at aol.com]

In a message dated 11/8/2016 2:19:41 P.M. US Mountain Standard Time,  
hanyou at xsmail.com writes:


Hi  all,

First, I apologize if I sound simplified in my questions ;o … I’m  kind’a 
still a novice when it comes to circuits ;p (even though I am a ham -  
general license)… but just want to make sure I have a few things straight  before 
I fire up this Teletype Model 15 that I have - that I got a couple of  
months ago :) ~...

First of all, I’ve been having trouble finding out  how the Model 15 is 
powered ;o .  I’ve gotten bits-and-pieces from  various people on how the 
machine should be powered, but nothing definitive ;o  .  So my questions :) :

1.  I understand that this machine  requires both AC and DC power.  Are AC 
and DC power on separate circuits  within the machine?
 



2.  Do I run AC and DC power simultaneously or  separately?
 
ac   for the  motor  etc
 
the loop is  dc
 



3.  One person has told me that in order to use it in  “typewriter mode”, 
I would need a DC power supply running at about 24-30vdc in  order to 
activate it.  I would also need AC power,  correct?
 
 
 

yes  this is called a loop supply  normally  660 mils  at  120 volts  but   
for  local loop  less can be  used




4.  I do have a variable-voltage transformer… do I  need anything special 
in-between the transformer - like fuses, diodes, etc ;o  ?
no  there is no isolation  use  with an isolation  transformer  for safety
 
 



5.  If AC power is required with DC and while running  in “typewriter mode”
, the machine receives the 60ma loop current through the  120vdc dedicated 
power connector, correct? 

6.  When running off  of they line-in (data), the 120vdc 60ma loop current 
comes from the data line  and not the dedicated DC power line, correct?

7.  What should I  set the DC transformer voltage to ;o ???  I understand 
that the voltage  requirement needs to be a bit lower than the 120vdc 
specified.

8.   When rotating the machine 180°, there is a part that has two wires and 
a few  bars (sorry, I’m not sure what this part is called) on the base of 
the unit -  right-near side… similar to what one can find in an old, rotary 
telephone (in  a telephone, it opens and closes the telephone circuit when 
pressing /  depressing the hook on the telephone).  This teletype has the two 
wires  cut from it and I can’t find any documentation on this part ;o … 
what is it  and is it critical ;o ???

9.  What can I use as a substitute oil  plug on the main shaft ;o ???  Mine 
is missing ~o~; ~…..

I’m sorry  if some of these questions overlap ;o … I’m just trying to 
exhaust all of my  questions and possibilities - to understand everything before 
doing anything  further :) .  For reference, I have three lines/power lines 
going into  the machine.  An AC power line going to terminals 21, 23 and  
ground.  Dedicated DC power line going to terminals 24 and 25.  Data  line 
(red jack) going to terminals 32 & 41 with a wire connecting  terminals 32 & 
42 together internally… not sure how this wiring on the  data line effects 
things ;o .  The motor its 120vac  synchronous.

Anyways, simplified explanations please xD hahah - I  sometimes can be kind’
a dense ;p ~o~; .  Thank you so much in advance for  all of your help - I 
really want to give this a thing a try ;D !

Cheers  ^^ !!!

Sincerely,
Eric  ^_^
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