<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hello Amrit,</div><div><br data-mce-bogus="1"></div><div>This is for your information. </div><div><br data-mce-bogus="1"></div><div>Best Regards </div><div>Pablo </div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Ruben Fair" <rfair@jlab.org><br><b>To: </b>"Pablo Campero Rojas" <campero@jlab.org><br><b>Cc: </b>"Renuka Rajput-Ghoshal" <renuka@jlab.org><br><b>Sent: </b>Monday, May 8, 2017 10:25:13 AM<br><b>Subject: </b>Fwd: Interlocks<br></div><br><div data-marker="__QUOTED_TEXT__"><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Pablo.,<br></div><br><div>Please refer to John Hogan's email below with regards to load cell limits during cool down:<br></div><br><div>For cooldown procedure; the limits for the supports are listed below <br><br> * Radial supports alarm at 65kN; load not to exceed 100kN <br> * Axial supports alarm at 5kN; load not to exceed 7.5kN </div><br><div>If not already done so, please update the spreadsheet (increase version no.) and update your PLC code.<br></div><br><div>Regards<br></div><br><div>Ruben<br></div><br><hr id="zwchr"><div><b>From: </b>"David Kashy" <kashy@jlab.org><br><b>To: </b>"John Hogan" <hogan@jlab.org><br><b>Cc: </b>"Ruben Fair" <rfair@jlab.org>, "Renuka Rajput-Ghoshal" <renuka@jlab.org>, "Glenn Young" <gyoung@jlab.org><br><b>Sent: </b>Monday, May 8, 2017 10:06:44 AM<br><b>Subject: </b>Re: Interlocks<br></div><br><div>Hi John,<br>My analysis starts with the axial supports with no free travel and with no load at Room temperature.<br>As the magnet shrinks during cooldown they become tighter and tighter until the magnet is at 4K<br><br><br>To have less than 5kN when the magnet gets to 4K the axial supports must start out with extra "slack" so that they only come into contact/tension when the magnet gets to about 120K. Is the design such that we can set them loose by the proper amount to achieve a design tension? Has it been determined how tensioning the Z suports will effect the cold mass alignment?<br><br>Dave<br><br><br><br><br>----- Original Message -----<br>From: "Hogan" <hogan@jlab.org><br>To: "Ruben Fair" <rfair@jlab.org>, "kashy" <kashy@jlab.org><br>Cc: "Renuka Rajput-Ghoshal" <renuka@jlab.org>, "Glenn Young" <gyoung@jlab.org><br>Sent: Monday, May 8, 2017 9:42:00 AM<br>Subject: Re: Interlocks<br><br>Ruben, <br><br>As I stated in my email to you, Dave, Bob and Renuka last Wednesday; the axial restraints are not loaded prior to the cooldown and are not designed to take the cooldown load. <br><br>At the start of the cooldown, there is no load on the axial restraints. <br><br>Dave, <br><br>For cooldown procedure; the limits for the supports are listed below <br><br> * Radial supports alarm at 65kN; load not to exceed 100kN <br> * Axial supports alarm at 5kN; load not to exceed 7.5kN <br><br>Please let me know if you have any other questions. <br><br>Thanks, <br>John <br><br>----- On May 8, 2017, at 7:37 AM, Ruben Fair <rfair@jlab.org> wrote: <br><br>> John,<br><br>> We will need to have the load limit issue resolved with ETI. Could you please<br>> push them for this again?<br><br>> I am extremely concerned about the Z support numbers that Dave has calculated -<br>> have you managed to review Dave's calcs? If you do not have time (I know things<br>> will be somewhat crazy at ETI this week), let Dave know and perhaps we can get<br>> Bob Miller, Joe Matalevich or Matt Marchlik to take a look.<br><br>> Regards<br><br>> Ruben<br><br>> From: "David Kashy" <kashy@jlab.org><br>> To: "Renuka Rajput-Ghoshal" <renuka@jlab.org><br>> Cc: "John Hogan" <hogan@jlab.org>, "Ruben Fair" <rfair@jlab.org>, "Glenn Young"<br>> <gyoung@jlab.org><br>> Sent: Monday, May 8, 2017 7:06:56 AM<br>> Subject: Re: Interlocks<br><br>> Folks,<br>> I'm continuing to update the cooldown procedure.<br>> I do not have any actual limits listed in the cooldown procedure for allowable<br>> loads during cooling.<br>> Is there a set?<br>> As stated before if the Z supports are snug at 300K they will reach ~7000lbs per<br>> the table attached this is more than 3X the fast dump value of 2240 in the<br>> table attached.<br><br>> Dave<br><br>> ----- Original Message -----<br>> From: "Renuka Rajput-Ghoshal" <renuka@jlab.org><br>> To: "kashy" <kashy@jlab.org><br>> Cc: "Hogan" jlab.org>, "Ruben Fair" <rfair@jlab.org>, "Glenn Young"<br>> <gyoung@jlab.org><br>> Sent: Monday, May 1, 2017 3:57:38 PM<br>> Subject: Re: Interlocks<br><br>> Hello Dave,<br>> We have given the attached file for load cells interlock values to Pablo and<br>> Wesley, but we are still waiting the information from ETI to confirm these<br>> numbers.<br>> John, do you have any idea when we get these numbers from ETI.<br><br>> Thanks<br>> Renuka<br><br>> ----- Original Message -----<br>> From: "Dave Kashy" <kashy@jlab.org><br>> To: "John Hogan" jlab.org>, "rfair" <rfair@jlab.org>, "Glenn Young"<br>> <gyoung@jlab.org>, "Renuka Rajput-Ghoshal" <renuka@jlab.org><br>> Sent: Monday, May 1, 2017 3:33:27 PM<br>> Subject: Interlocks<br><br>> Hi All,<br><br>> Since I'm working the CD procedure, I was just wondering if we have implemented<br>> interlocks on force sensors so during cooldown or powering there are measures<br>> in place to keep the magnet safe.<br><br>> Do we have a table of safe range that will be presented at the ERR?<br>> Should it be in one of my talks or elsewhere?<br><br>> Thanks<br>> Dave</div></div><br></div></div></body></html>