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VIS (IY)
fabian.arellano - 11:25 Wednesday 01 April 2020 (13923) Print this report
Comment to ITMY IP H2 coil was satulated (13922)

I offloaded the coil-magnet actuation onto the IP horizontal fishing rods. At the end of the work I left the suspension in TWR_DAMPED.

When the IP control system is on the amount of actuation now becomes, approximately:

  • L: 2200 cnt,
  • T: 2500 cnt,
  • Y: 3400 cnt,
  • H1: -8000 cnt,
  • H2: 6000 cnt,
  • H3: 5900 cnt.

In terms of displacement the current position in SAFE mode is

  • L: 290 um,
  • T: 462 um and
  • -720 urad.
  • Time: 02:19:00 UTC on 2020-04-01.

The set point is

  • 100 um,
  • 200 um and
  • -706 urad.

Before offloading the position of the IP in SAFE state (K1:GRD-VIS_ITMY_STATE_N = 30) was

  • L: 276 um,
  • T: 1114 um
  • Y: -831 urad
  • Time: before 00:46:00 UTC on 2020-04-01.

Note also that

  • Ramp time in the IP DAMP filter box was 60 seconds and I left it as it was.
  • By mistake I moved the top filter yaw stepper motor by 10,000 counts, but I moved back and it seems to be alright.

After the work I engaged TWR_DAMPED. The control system of the IP and of the BF look alright. The picture shows the total amount of steps required.

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