Re: [time-nuts] Varian 921-0062 ion pump supply question
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 29 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: cdel...@juno.com cdel...@juno.com To: time-nuts@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Varian 921-0062 ion pump supply question
Hi Corby, I had a look at some circuits and it’s pretty much what I expected. The 120V tap supplies control relays including the external pressure relay (pin F on rear panel connector, pin E is neutral) and neon indicators. The supply to the HV transformer is relay controlled so you would have to bypass that to do the low voltage power-up trick. The four terminal transformer has odd numbering with one winding between 1 3 and the other between 2 4. This allows the same rigid shorting links to be used for both 120 and 240V, one each between 12 and 34 for 120V and two stacked between 34 for 240V. The safe option would be to apply 12V ac across 13 with no links and check the voltages and phase on the other windings and taps. The secondary should be 1/10 of that expected. If it high you need to use the additional taps on terminals 89. One possibility is that these taps are an alternative to a tapped secondary for HV adjustment. For 120V input the extra tap wire should be connected to the input supply so you have line voltage across pins E F of the pressure relay connector. Don’t forget that there is another switch or links on the control PCB for the small transformer. HTH Robert G8RPI. From: cdel...@juno.com cdel...@juno.com To: time-nuts@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Varian 921-0062 ion pump supply question
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: cdel...@juno.com cdel...@juno.com To: time-nuts@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Varian 921-0062 ion pump supply question
Try a Google search on it, you will find the manual. 73, Dick, W1KSZ On 9/19/2013 12:43 PM, cdel...@juno.com wrote: Varian 921-0062 ion pump controlle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
