[Dsg-hallb_magnets] Tested Solenoid- Estimated temperature in the coils

[Ruben Fair]

Thank you very much Pablo.

An excellent afternoons work

Regards

Ruben

> On Aug 4, 2017, at 7:04 PM, Pablo Campero <campero at jlab.org> wrote:
> 
> Hello Ruben,
> 
> 
> the following are the task completed in order to test the estimated temperature in the coils:
> 
> 1. Measured inductance across the whole magnet to make sure continuity.
> 2. Injected current 1 [A] on the leads to perform the test at 12 [V] across the whole magnet(VT_20), voltage enough for the test.
> 3. Measured voltage values in the Voltage Tap panel at the solenoid controls rack 
> 4. Recorded measured values for each voltage tap connected.
> 5. Monitor readback voltage values in the EPICS screen. (Values matches with the measured voltage values on the voltage tap panel)
> 6. Record FastDAQ data to log the voltage taps behavior during the test.
> 7. Monitored archived data and EPICS readouts for the 5 estimated temperature in the coils. (Noticed that the archived plots were out of scale)
> 8.Verified PLC logic used to calculated the temperatures based on the VT6,VT14,VT8,VT12, VT10 and current in the coil 
>     For this test, it was not consider the values of the dump resistor because was used and external (0-18 A) power supply (considered current on dump resistor = 0 [A])
>     PLC code will be returned to normal operation logic once the Magnet power supply will be connected.
> 
> The results for this test are displayed in the next table:
> 
> Signal Name                        	Readouts Voltage Taps [V] 	Temperature Estimated read [K]
> COIL1_T_EST	VT6_DAQ = 1.345 	301.80
> COIL2_T_EST	VT14_DAQ = 1.346	302.46
> COIL3_T_EST	VT8_DAQ = 2.180	307.51
> COIL4_T_EST	VT12_DAQ = 2.191	307.76
> COIL5_T_EST	VT10_DAQ = 4.266	305.32
> 
>  Estimated temperatures expected about 300 K. Test completed successfully.
> 
> 
> 
> Wesley,
> Can please take a look the archived plots for these five signals. The scale for the temperature values seems to be out of range.(see attached screenshot) they don't match with the readout values that were read.
> During the test the 'Solenoid Cooldown Parameter EPICS screen' displayed the correct values, only the archived plots had the issues.
> 
> 
> Best Regards,
> Pablo
> 
> 
> 
> 
> 
> 
> <Temperarute estimate coil 1-5.JPG>
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