From Felicia@cryogenic.co.uk Tue Aug 29 16:38:23 2006 Received: from smtp001.apm-internet.net ([85.119.248.9]) by mail1.Physics.LeidenUniv.nl with Microsoft SMTPSVC(6.0.3790.1830); Tue, 29 Aug 2006 16:38:47 +0200 Received: (qmail 79608 invoked from network); 29 Aug 2006 14:38:23 -0000 Received: from unknown (HELO cryogenic.co.uk) (213.120.114.238) by smtp001.apm-internet.net with SMTP; 29 Aug 2006 14:38:23 -0000 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: FW: problems with SMS120C Q5390 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Tue, 29 Aug 2006 15:38:23 +0100 Message-ID: <3FBC6B0F963CBF41AE784D72A2D88C1A0F9828@CRYSRV01.cryogenic.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: problems with SMS120C Q5390 Thread-Index: AcbKwoi9upsjZK9VQBqUFOUqyBPT9wAr9szwAAChCgA= From: "Felicia Doughty" To: Return-Path: Felicia@cryogenic.co.uk X-OriginalArrivalTime: 29 Aug 2006 14:38:47.0851 (UTC) FILETIME=[D64CCFB0:01C6CB78] Status: R X-Status: NC X-KMail-EncryptionState: X-KMail-SignatureState: X-KMail-MDN-Sent: =20 Dear Federica, Repair will cost between =A3250 and =A3350. To replace the linear power supply, it would be an extra =A3150. If you chose to have it modified, this would include replacing = conductors with FET reversing switch, an additional =A3900. If you would like to go ahead with the repair or modification, please = let us know and we will give you the appropriate authorization to send = the Power Supply to us. Best Regards, Felicia Doughty, Sales Administrator. =20 Cryogenic Ltd Tel: +44 20 87436049 Fax: +44 20 8749 5315 www.cryogenic.co.uk -----Original Message----- From: Mirek Owczarkowski=20 Sent: 29 August 2006 14:53 To: Felicia Doughty Subject: FW: problems with SMS120C =20 -----Original Message----- From: Federica Galli [mailto:galli@physics.leidenuniv.nl] Sent: 28 August 2006 17:59 To: Mirek Owczarkowski Subject: problems with SMS120C Dear Mirek, after a few times we had again problems with our SMS120C power supply. = This sort of problems (which I will describe below) we had already had = occasionally before, but now it happens so frequently that normal magnet = operation is hindered. Problem 1: as I told you by phone last week, a few times after switching = on the mains the error is given: "Power fail interrupt fault".=20 Problem 2: when ramping the field (current) to a given set point, both = the actual output current/voltage and what is indicated on the front = display start to go wrong. For example, when "ramping to 30A at the rate = of 0.1A/s", after a while suddenly the voltage becomes negative on the = display, the current decreases (both on display and on the output) often = at a much higher rate than the preset, but still the given message is = "ramping to 30A at the rate of 0.1A/s". If I kick gently on the display, = suddenly the current increases again as it should and the voltage = becomes positive. Occasionally the "wrong" behaviour occurs again, and = again by tapping on the display it can be fixed for a short time. As I = just said, it's not just a display problem: when the display shows the negative values, the output reflects = the values exactly. It has also occurred when ramping down the current; = then suddenly the power supply would start to ramp up (positive = voltage). I have checked for loose connectors inside, in the vicinity of the = display and on the boards themself, but found nothing obvious. I have = the feeling that there is somewhere a loose contact on one of the = boards, or a small crack. I also think that the 2 large relay, when = switching, shake some connections around and some might have become = progressively loose. I tried to call up Cryogenic today, but I guess it's a bank holiday over = there. Could you please send me a quotation as soon as possible, with = mentioned the price for the repair and also the cost for the upgrade for = the reverse switch? Could you also change the "old" low voltage power = supply as you suggested by phone (the one inside the brass grid-case). = And finally, would it be possible to receive from you a wooden crate for = delivering the power supply in a safe way? Thank you very much for your help and cooperation, best regards, Federica --=20 Federica Galli=09 Leiden Institute of Physics Niels Bohrweg 2 2333 CA Leiden The Netherlands FAX: 0031-71-5275404 TEL: 0031-71-5275468 email: galli@physics.leidenuniv.nl web: http://www.xs4all.nl/~fgalli/ email: fed.galli@gmail.com