[Dsg-hallc_controls] Quadrupole field regulation

[Amanda Hoebel]

If the operator inputs an I_target value and then selects to start regulation, the I_target value will be stored as Last_I_sent (on the function block diagram). On the ladder logic, I_coarse is basically being compared to I_target, since I_target and Last_I_sent would be the same value. The program would still work with the PSU starting from zero. 



From: "Mike Fowler" <fowler at jlab.org> 
To: "dsg-hallc controls" <dsg-hallc_controls at jlab.org> 
Sent: Friday, September 28, 2018 2:28:11 PM 
Subject: Re: [Dsg-hallc_controls] Quadrupole field regulation 

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: 

BQ_BEGIN

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: 

BQ_BEGIN

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 


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BQ_END




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