With Hirata and Washimi.

See pictures at SR3 Remedying Work after O3.

• We connected the motor with the teflon tube aroud the pins for elecrtical isolation.
• We rolled the cables in a loop and held the loop together with kapton wire (cheaper than PEEK cable ties).
• The limit switch cables don't have mechanical support, so we fixed them to the rolls of thick kapton wire leaving a slack between the motor and the roll.
• In F0 FR we installed the trigger for the limit switches.
  • We found a component of the carriage has rust. See this picture.
  • We also found that in the old assembly we are using solver coated screws in silver coated nuts. See same picture where one of them is still shown. These screws are not used in the new assembly.
• We put back the IP arch ballast masses onto the IP table taking care of the trapped cables underneath the archs and in recesses.
• We released F0 and the IP.
• The F0 keystone does not have ballast mass on top, therefore, we were not able to compensate for the additional 98 grams of the new yaw stepper motor assembly. Upon release the keystone went down to -1258 um (setpoint at -834 um).

With Washimi-san.

See pictures at SR3 Remedying Work after O3.

We installed the support for the F0 FR motor limit switches. The process went smoothly. Because the mechanical support for the cables was not considered in the design, we attached the limit switch cables  to a nearby pillar. No picture of this in SR3 but there's a picture of a similar arrangement in SRM here. We used kapton wire as a cable tie.

We tested the upper switch using Ikeda-san's current script:

• According to what we know, the polarity of the motor is the correct one for the script to work: positive number of steps moves the FR up (see klog ).
• We turned the switches on in the medm screen by writing 1 in a field next to a button with a letter "D". We pressed the button afterwards (see JGW-T2011520).
• I moved the upper limit switch down close tot the FR carriage just for the test.
• The upper switrch is called "Right" in the steper motor driver convention.
• The script did not detect automatically when the switch had been pressed by the trigger plate, I had to press the corresponding medm update button to check the reaction of the software.

After the test I set up the position of the upper limit at a suitable height. In such a position, the carriage is about 2 mm or 3 mm from the physcal stop nuts. See picture1 and picture2.

With Washimi-san.

See pictures at SR3 Remedying Work after O3.

We installed the support for the F0 FR motor limit switches. The process went smoothly. Because the mechanical support for the cables was not considered in the design, we attached the limit switch cables  to a nearby pillar. No picture of this in SR3 but there's a picture of a similar arrangement in SRM here. We used kapton wire as a cable tie.

We tested the upper switch using Ikeda-san's current script:

• According to what we know, the polarity of the motor is the correct one for the script to work: positive number of steps moves the FR up (see klog 15272).
• We turned the switches on in the medm screen by writing 1 in a field next to a button with a letter "D". We pressed the button afterwards (see JGW-T2011520).
• I moved the upper limit switch down close tot the FR carriage just for the test.
• The upper switrch is called "Right" in the steper motor driver convention.
• The script did not detect automatically when the switch had been pressed by the trigger plate, I had to press the corresponding medm update button to check the reaction of the software.

After the test I set up the position of the upper limit at a suitable height. In such a position, the carriage is about 2 mm or 3 mm from the physcal stop nuts. See picture1 and picture2.

With Washimi-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, all of them worked well.
• The switch H1, -Yaw, Left produces a signal indicating it is pressed, although it is not. This is because it's made of metal sheet and is bent in such a way that the electrodes are not making contact. There's an illustrative  drawing in SR2 notebook. It has be to fixed.

Using the lower switch of F0 FR we tested the ability of the driver to stop the motor when the switch is pressed. It worked well. See this video.

We connected the satellite cables that we had disconnected as preparation for the cleaning.