[Dsg-hallc_controls] Quadrupole field regulation

[Mike Fowler]

Condition one: PSU starting from zero

Operator>  Inputs an I_target and I_MOL value.
PLC> Checks I_target if in limits, sets the MPS_Wa_Value
Operator> Start regulation
PLC> Compares analog I_coarse to Last_I_Sent which is assumed to be zero.
             If I_coarse > Last_I_Sent the code sends MPS_Wa_Value to 
PSU.   Note: analog I_coarse value could be non zero and the MOL value 
is not sent.
PLC> Waits for I_coarse to be equal to MOL value +/-1%. Was the MOL 
value ever sent?

Mike





On 9/28/2018 2:00 PM, Amanda Hoebel wrote:
> The operator would input an I_target and I_MOL value, then select to 
> start regulation.
>
>
> ------------------------------------------------------------------------
> *From: *"Mike Fowler" <fowler at jlab.org>
> *To: *"dsg-hallc controls" <dsg-hallc_controls at jlab.org>
> *Sent: *Friday, September 28, 2018 1:54:31 PM
> *Subject: *Re: [Dsg-hallc_controls] Quadrupole field regulation
>
>
> Hi,
>
> What is the sequence of inputs from the operator?
>
> Mike
>
>
>
> On 9/28/2018 1:30 PM, Amanda Hoebel wrote:
>
>     Hi Mike,
>
>     I have some questions/comments (in blue) on some of your comments
>     for the current loop regulation.
>
>     4. If the analog signal I_coarse is less than the Last_I_Sent by
>     even a small fraction the MOL value is used.
>     Yes, as the PSU would be ramping up, even if it's by a small
>     amount. This would only occur if someone were to set an
>     I_target/Last_I_Sent value that was very close to what the power
>     supply was already at. If that is not the correct method, what
>     should be done instead?
>
>     7. Consider this:
>     If I_coarse is equal to Last_I_Sent +/- a few amps
>         true, MPS is at setpoint
>         false, The MPS is still ramping, something happened, or the
>     MPS tripped and the Last_I_Sent was not updated. (Interlock?)
>                 or the window is too small. Determine what to do.
>     I am unsure of what you are suggesting. I will implement a
>     condition where the loop stops if there is an interlock (as per
>     comment #1) and can add a case where the program continues to the
>     next rung if the PSU_Ready is True, in the event that the window
>     is too small. Any other problem that could arise seems like it
>     would be related to the PSU itself, not the program. The program
>     does not ramp the PSU and stop ramp only if the current falls
>     within the window. The PSU will stop at the set point given (no
>     runaway condition possible).
>
>     8. Compare Q1_I_Target to Last_I_Sent to determine ramp direction
>     instead of the analog I_coarse.
>     Q1_I_Target and Last_I_Sent cannot be compared for ramp direction,
>     as they will be the same value as each other on the ladder logic
>     when the regulation routine is enabled.
>
>     Regards,
>     Amanda
>
>     ------------------------------------------------------------------------
>     *From: *"Amanda Hoebel" <amandah at jlab.org>
>     *Sent: *Wednesday, September 26, 2018 10:04:46 AM
>     *Subject: *Re: [Dsg-hallc_controls] Quadrupole field regulation
>
>
>     ------------------------------------------------------------------------
>     *From: *"Mike Fowler" <fowler at jlab.org>
>     *To: *"dsg-hallc controls" <dsg-hallc_controls at jlab.org>
>     *Sent: *Tuesday, September 25, 2018 10:37:25 AM
>     *Subject: *Re: [Dsg-hallc_controls] Quadrupole field regulation
>
>     Hi,
>
>     Comments.
>
>     The ability to manually input a current and send it without a MOL
>     value has been removed.
>     Must be included.
>
>     Cheers,
>     Mike
>
>
>
>     On 9/20/2018 9:12 AM, Amanda Hoebel wrote:
>
>         Hi Mike,
>
>         I have attached pdfs of the field regulation routine for HMS
>         Q1.  If this is correct I will make the routines for HMS Q2
>         and Q3, and for the quads in SHMS.
>
>         Regards,
>         Amanda
>
>
>         _______________________________________________
>         Dsg-hallc_controls mailing list
>         Dsg-hallc_controls at jlab.org
>         https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls
>
>
>
>     _______________________________________________
>     Dsg-hallc_controls mailing list
>     Dsg-hallc_controls at jlab.org
>     https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls
>
>
>
>     _______________________________________________
>     Dsg-hallc_controls mailing list
>     Dsg-hallc_controls at jlab.org
>     https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls
>
>
>
> _______________________________________________
> Dsg-hallc_controls mailing list
> Dsg-hallc_controls at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls
>
>
> _______________________________________________
> Dsg-hallc_controls mailing list
> Dsg-hallc_controls at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallc_controls


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallc_controls/attachments/20180928/a7987844/attachment.html>