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fabian.arellano - 13:12 Monday 19 October 2020 (15272) Print this report
Stepper motor polarities.

With Miyo-kun and Washimi-san

On Saturday 17th we re-routed cables in SR suspesions and connected them back onto the chamber.  Namely, the cables were for IP and GAS LVDTs and fishing rod stepper motors. After the work we checked the system was functional. The IM OSEMs and oplev cables remain disconnected.

The polarity of the stepper motors is given in the tables below. It is important to bear in mind that the polatity given of the IP is not that of the motors directly, but of the virtual degrees of freedom (DoF). This is, it's given in terms of L, T and Y instead of H1, H2 and H3. Shoda-san wrote the code for actuating in the virtual DoF and the polarity of the motors likely can be read from her code.

SR2, for a positive number of steps.
Stage LVDT motion direction
BF negative (down)
F1 negative (down)
F0 positiv (up)
IP-L positive (forward)
IP-T positive T (left)
IP-Y positive Y (counterclockwise)

 

SR3, for a positive number of steps.
Stage LVDT motion direction
BF negative (down)
F1 Fishing rod not functional.
F0 positive (up)
IP-L positive (forward)
IP-T positive T (left)
IP-Y positive Y (counterclockwise)

 

SRM, for a positive number of steps.
Stage LVDT motion direction
BF negative (down)
F1 negative (down)
F0 negative (down)
IP-L positive (forward)
IP-T positive T (left)
IP-Y positive Y (counterclockwise)


(Page 197 in Fabian's notebook)
 

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