[Tomaru, Okutomi]
Trouble report: klog#12375
- We turned off the LED lights in the X-end 1F.
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I found that the ETMX BF GAS control output got saturated this morning.
- It seems the saturation is caused by the circumambient temperature drift, as we expected.
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We can see clear correlation between the BF temperature and GAS control outputs (see the figure below).
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The drift started at 2019-12-29 corresponding to Inoue-san's work as discussed in the emails: [gokagra 03592]
- By the way, I could not find the klog post of this work.
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The drift started at 2019-12-29 corresponding to Inoue-san's work as discussed in the emails: [gokagra 03592]
- Only the BF GAS control has got saturated, while the other GAS controls are not yet but have been getting closer to their actuation limit.
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For the moment, I left the ETMX GAS control as it is without any offloading works.
- Because we can expect that turning-off of the LEDs could recover the control outputs to their original values close to zero again.
- The current net height variation of the payload stages due to this saturation is ~ 4 um, negligiblly small enough.
