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

[Robert Atkinson]

Hi Corby,
How's it wired now? Basically it should be two windings in series, say line to 1, 2 linked to 3 and neutral to 4. To set to 120V leave line and neutral were they are and link 2 to 4 and 3 to 1. As a double check for phasing when you lift the link between 2 and 3 check for winding resistance between 1 and 2  and separately 3 and 4. They should benear identical resistance values. Change tag numbers to suit your original wiring.

HTH,
Robert G8RPI.




________________________________
 From: "cdelect at juno.com" <cdelect at juno.com>
To: time-nuts at febo.com 
Sent: Thursday, 19 September 2013, 20:43
Subject: [time-nuts] Varian 921-0062 ion pump supply question
 

Hi,

I'm working on a Varian 921-0062 ion pump controller for the pumps used
in a Maser.

I just got it in and it is wired for 240 VAC and I want 120VAC.

My manual and the ones I can find on line show a power TX with 4 input
terminals which they show how to strap for 240 or 120 VAC.

My unit has TX has 6 terminals 1/2/3/4/8/9.

Does anyone know how to wire this TX for 120 VAC?

Thanks,

Corby Dawson

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