[time-nuts] Varian 921-0062 ion pump supply question

[Robert Atkinson]

Hi Corby,
What pins are the line and the neutral connected to at the moment? What pins are linked?
What you describe is typical of a 110/120/220/240 setup with the windings between 1 &8 and 2&9 being the 10V taps. 
You could try connecting a low voltage AC supply (between5 and 15 v from a transformer) to the amins input and measuring the transformer input voltages. This will give you the voltage ratios and phasing.
I'll try to find the manual online and see where the tap goes.
 
Robert G8RPI.
 

________________________________
 From: "cdelect at juno.com" <cdelect at juno.com>
To: time-nuts at febo.com 
Sent: Thursday, 19 September 2013, 22:56
Subject: [time-nuts] Varian 921-0062 ion pump supply question
  

Here is the deal.

The 4 terminal TX wiring is pretty obvious. (I have a unit with the 4
terminal to compare with)

The 6 terminal I have ohmed out and it is not obvious!

Pins 1 to 3 and 2 to 4 (.5 Ohms) appear to be the 120VAC windings and
hooking them in parallel should do the trick.

As wired for 240 VAC 1 to 3 and 2 to 4 are in series which makes sense.

However when the 4 terminal is wired for 240VAC a wire comes off the
input center tap to provide 120VAC to some circuits in the unit.

The 6 terminal when wired for 240VAC has an extra wire connected to pin
8.

Pin 8 to 1 and pin 9 to 2 show .2 Ohms so they look like maybe taps for a
different input voltage slightly different from 120VAC.

The problem there is that the wire to pin 8 which would logically go to
the center tap as above goes to this pin 8 tap which makes no sense!

Of course it could have been miswired when I got it!

All the manuals I can find by Goggling show the 4 pin TX!

Was hoping someone might have a unit with the 6 pin TX wired for 120VAC
so they could advise me!

Thanks,

Corby

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