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AOS (Beam Reducing Telescopes)
tomotada.akutsu - 23:58 Tuesday 02 October 2018 (6389) Print this report
[TMSX] polarity check of LVDTs and actuator coils

K. Nagano, Aritomi, K. Tanaka, Kita, Akutsu

Have checked polarity of the LVDTs and actuator coils of the TMS-VISX. See here for details.

LVDTs

I moved the suspended table by my finger while looking at VIS-TMSX_LVDTINF_**_INMON:

LVDT V1 neg
LVDT V2 pos
LVDT V3 neg
LVDT H1 pos
LVDT H2 pos
LVDT H3 pos

where

  • Vertical: postive means that the LVDT outputs positive counts when TMS-VIS moves upward.
  • Horizontal: postive means that the LVDT outputs positive counts when TMS-VIS moves positive yaw (counter clock wise from top view).

Actuator coils

We input positive counts to the actuator coils while looking at raw LVDT signals (VIS-TMSX_LVDTINF_**_INMON):

Actuator  Coil VIS-TMSX_LVDTINF_**_INMON
V1 neg
V2 pos
V3 neg
H1 pos
H2 pos
H3 pos

So, considering the polarity of the LVDTs themselves shown in the first table, all the actuator coil provide force toward positive firection (vertical->upward, yaw->counter clock wise).

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