[Dsg-hallc_controls] Quadrupole field regulation

Tue Nov 6 16:10:25 EST 2018

Hi Mike, 

Attached are PDFs for the current regulation function block diagrams and ladder logic for Q1 HMS. Let us know if you find anything in the program that is not correct. 

Regards, 
Amanda 

From: "Mike Fowler" <fowler at jlab.org> 
To: "dsg-hallc controls" <dsg-hallc_controls at jlab.org> 
Sent: Thursday, October 18, 2018 11:42:23 AM 
Subject: Re: [Dsg-hallc_controls] Quadrupole field regulation 

>>What should happen to the power supply should an interlock occur? Meaning if an interlock occurs and the regulation is stopped... 

If an interlock should occur the MPS will ramp down. The regulation program should stop and return to standby, waiting for new input from the operator. 

Cheers, 
Mike 

On 10/18/2018 9:45 AM, Amanda Hoebel wrote: 

Hi Mike, 

It does look like there was a tag and operator missing from the pdf I had sent you. They exist in the version of the program I was looking at. Before I send the newest version I have a question on one of the program requirements. In your comments you stated that: 

1. If an Interlock occurs the regulation is not stopped. Need this. 
2. If the MPS is ramping and the operator stops the regulation, the I_coarse value should be sent to the MPS. (Stop where it is) 

What should happen to the power supply should an interlock occur? Meaning if an interlock occurs and the regulation is stopped, are you saying the I_coarse value should be sent to the MPS just as it should be done if the operator stops the regulation? 

Regards, 
Amanda 

From: "Mike Fowler" <fowler at jlab.org> 
To: "dsg-hallc controls" <dsg-hallc_controls at jlab.org> 
Sent: Friday, September 28, 2018 3:45:32 PM 
Subject: Re: [Dsg-hallc_controls] Quadrupole field regulation 

>>>the operator inputs an I_target value and then selects to start regulation, the I_target value will be stored as Last_I_sent 

Perhaps I am missing the code where start regulation triggers where Last_I_Sent is made equal to I_target. 

Mike 

On 9/28/2018 3:02 PM, Amanda Hoebel wrote: 

BQ_BEGIN

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: 

BQ_BEGIN

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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