KAGRA Logbook

Reports 1-1 of 1

VIS (SR2)

fabian.arellano - 22:14 Wednesday 02 December 2020 (15583)

F0 vertical and yaw stepper motor limit switch installation.

Hirata, Yano, Fabian

Related pictures can be found in the album SR2 Remedying work after O3.

The installation of the limit switches for both systems was completed.

The cabling diagram is the same as in other SR suspensions and it's reported in the notebook and in the photo album.
We tested the switches using the medm screen by pressing the switches manually. They worked well.
The ballast mass on top of the F0 keystone was 303 grams.
The mass of the old and new yaw stepper motor assemblies are (with cables)
- New: 758 g
- Old: 647 g
- Difference: 111 g
We removed 110 g, so the current amount of ballast is 304 grams.

Comments to this report:

fabian.arellano - 16:49 Friday 04 December 2020 (15593)

With Hirata-san, Yano-san.

We tested the IP limit switches made by Nikhef. We pressed them with an Allen key and checked the signal in the medm screen when pressing the update button.

All the switches are in the place expected by the medm screen.
With the exception of the switch (H1, -Yaw, Left) and (H2, -Yaw, Left), all of them worked well.
The switches (H1, -Yaw, Left) and (H2, -Yaw, Left.) produce signals indicating they are pressed, although they are not. There's an illustrative drawing in SR2 notebook. They have be to fixed.
In the case of (H1, -Yaw, Left) the head of a screw anchoring the spring blade is close to the switch and it may be causing trouble, but we are not sure. We wanted to check with the camera but the camera is currently out of service. We need to check again.