With Hirata and Washimi
Pictures to be found in SR3 Remedying Work after O3.
- We opened the chamber and saw the F0 keystone doesn't not have any ballast mass on top.
- I checked the polarity of the F0 LVDT by hand: pushing the keystone up produced a positive LVDT output (as expected).
- I wanted to check the polarity of the stepper motor. However, the motor didn't seem to be mowing smoothly. I changed the channel in hardware and software (Ikeda-san did it) but nothing changed. I have to check again more carefully.
F0 Fishing Rod
We connected the limit switches according to the diagram shown in this picture, which is the same we used in SRM:
- Upper switch: R for right in the driver naming convention, brown cable to pin 4, blue cable to pin 9.
- Lower switch: L for left in the driver naming convention, brown cable to pin 3, blue cable to pin 8.
- We checked the switches work with the medm screen.
F0 yaw stepper motor
- The connector for the limit switches was not on the IP table but underneath. Additionally, the cable was laid underneath the arch weights of the IP, making moving the connector impossible. We removed the arch weigts and moved the connector to the IP table.
The cabling can be seen in the picture of the notebook:
- Switch at the shaft side: L for right in driver naming convention, brown cable to pin 3, blue cable to pin 8.
- Switch at the motor side: R for left in driver naming convention, brown cable to pin 4, blue cable to pin 9.
- In SRM the switches have to exchange places in irder to have this same cabling diagram. There was an error and Satou-san corrected it.
Weight of the two stepper motor assemblies (with the cables off from the scale, see pictures):
- New: 722 grams.
- Old: 624 grams:
- Difference: 98 grams (similar to the 101 grams diffeence between the motors used in SRM).
- In the old motor we measured the length of the shaft that sticked out of the aseembly (see this picture) and we set the shaft of the new motor in the same position in order to kee the same yaw position of the suspension.
The cabling of the motor was set as follows (picture):
- Green to pin 6
- Gray to pin 1.
- This should move the suspension in +Y with a positive number of steps (as in SRM).