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ryutaro.takahashi - 11:03 Monday 02 August 2021 (17715) Print this report
Setpoint of GAS filters

This is the setpoint of GAS filters for DC controls.

[count]

  IX EX
F0 -11600 -8500
F1 7800 -12500
F2 2300 X
F3 3500 12600
BF 2900 8500

 

Comments to this report:
kouseki.miyo - 18:47 Monday 02 August 2021 (17728) Print this report

I tried to offload the GAS_LVDT value for all stages of ITMX. but some stages (F0, F2, F3) are not offloaded.

  Target(klog#17715) Today Memo
F0 -11600 -14600 No. I could not move anymore because the limit switch was touched.
F1 7800 7600 OK!
F2 2300 2900 No. I could not because keystone may be touched some where around 2600.
F3 3500 4000 No. Stepper motor could not move the fishing rod.
BF 2900 2900 OK!

I will try it with Ikeda-san, and try ETMX after ITMX.

ryutaro.takahashi - 20:24 Tuesday 03 August 2021 (17746) Print this report

[Takahashi, Sato, (remote) Ikeda]

We tyied to adjust the filter height for F0, F2, and F3.

F0: We found mismatching between the FR range and the keystone range. The ballasts (0.44kg x2) were added onto the F0. The FR range was measured and the limit switches were reset along the range. Relation between the FR height and the keystone height has hysteresis, so one ballast (0.44kg) was removed to set the keystone height to the setpoint.

F2: The keystone height passed through the setpoint once, but the keystone has reached upper mechanical limit. After that the FR didn't work at all.

F3: The keystone height was set to the setpoint using the stand alone driver.

ryutaro.takahashi - 20:51 Wednesday 04 August 2021 (17767) Print this report

[Takahashi, Sato]

We adjusted the filter height to the setpoint in EX. Detail of the FR operations will be reported later.

ryutaro.takahashi - 17:25 Thursday 05 August 2021 (17817) Print this report

[Takahashi, Sato]

This is detail of the FR operations in EX yesterday.

Images attached to this comment
ryutaro.takahashi - 11:50 Tuesday 17 August 2021 (17935) Print this report

(Log on 8/16)

[Takahashi, Sato]

We checked the F2 FR.

  1. The relation between the step in FR and the LVDT signal was revised. The sign of step was wrong in the last time.
  2. Put a small weight (~30g) on the BF cup. The F2 keystone was released from the upper limit (from -980 to -100 in LVDT count).
  3. Moved the stepper motor by -25600 step. The keystone could go down from -100 to +960.
  4. Removed the small weight. The keystone went up from +960 to +260, but it was still free.
Images attached to this comment
ryutaro.takahashi - 16:38 Friday 12 November 2021 (18870) Print this report

I revised the setpoints in IX along the new height setting.

  LVDT count comment
F0 15600 near upper limit
F1 6750 mid point
F2 6100 lower point
F3 3000 higher point
BF 4100 mid point

 

 

ryutaro.takahashi - 10:25 Monday 15 November 2021 (18893) Print this report

I revised the setpoints in EX owing to the recalibration of F0.

  LVDT count
F0 4520
F1 -12500
F2 X
F3 12600
BF 8500

 

ryutaro.takahashi - 16:51 Monday 15 November 2021 (18898) Print this report

This is a present summary of the setpoints in count and um.

IX count um   EX count um
F0 15600 4362   F0 4520 -1782
F1 6750 -1215   F1 -12500 2791
F2 6100 -1327   F2 X X
F3 3000 623   F3 12600 -2831
BF 4100 -1197   BF 8500 1730
takafumi.ushiba - 12:05 Friday 19 November 2021 (18950) Print this report

According to the calibration factor in klog18909, there still seems to be some discrepancies between LVDT count and setpoint.
For example, IX F0 LVDT setpoint in the unit of cnts are 15600 according to klog18898.
This value is corresponding to 15600*0.280=4368 um (0.280 is coming from the calibration factor which is posted in klog18909).
However, your summary says F0 LVDT setpoint is 4362 um.

Of course, this discrepancy is negligible in practical application but I would like to confirm what is the origin of the discrepancy to make sure there is no misunderstanding each other.
 

ryutaro.takahashi - 9:31 Thursday 02 December 2021 (19054) Print this report

I updated the summary of the setpoints for the GAS filters.

IX count um   EX count um
F0 15600 4362   F0 -1500 591
F1 6750 -1215   F1 -12500 2791
F2 6100 -1327   F2 X X
F3 3000 623   F3 13700 -3078
BF 4100 -1197   BF 8500 1730
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