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21. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 17 Aug 2016 00:36:44 +0000; Jim, So, I was just asking if anyone on Amps had tried using an SCR to control a large choke-input power supply ? I haven't done it myself, but I have worked with equipment from the 1970s that worked; /archives//html/Amps/2016-08/msg00039.html (10,861 bytes)
22. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Fri, 19 Aug 2016 09:30:23 -0500; SCR control of an inductive load is not so cut and dried simple as some would like to think. The gates of SCR's need to be pulse fired for reliable phase control. Commercial units have pulse train bu; /archives//html/Amps/2016-08/msg00041.html (11,826 bytes)
23. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Fri, 19 Aug 2016 18:15:58 +0200; Racal regulated all power supplies in their TA1800 amp with SCRs except anode voltage. They used transformers with 205V primary for the heater, the bias and the screen of the 4CX10000. The screen vol; /archives//html/Amps/2016-08/msg00045.html (9,173 bytes)
24. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 20 Aug 2016 22:35:31 +0000; Paul, and all, The gates of SCR's need to be pulse fired for reliable phase control. Commercial units have pulse train burst applied to the gates through a pulse transformer. The phase angle of the b; /archives//html/Amps/2016-08/msg00050.html (10,305 bytes)
25. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 21 Aug 2016 06:21:02 -0400; In the early days, we just used a Diac in a simple circuit. No big pulse and no series of pulses. Once the threshold was reached, the SCR was in control of the rest including how fast it turned on. W; /archives//html/Amps/2016-08/msg00056.html (12,034 bytes)
26. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Sun, 21 Aug 2016 11:20:28 -0500; We were precisely phase controlling the firing of large phase control (made by Semikron) 300 amp 1600v SCR's for full regenerative control of 50hp 3 phase motors in lifting / lowering applications. T; /archives//html/Amps/2016-08/msg00062.html (11,049 bytes)

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