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VIS (IX)
kouseki.miyo - 10:49 Wednesday 29 July 2020 (14820) Print this report
ITMX_GAS_F1,2 are offloaded

Shoda Miyo

We offload the F1,F2_GAS output signal by moving each fishing rod.

  • To reeduce the input signal of the damp filter, we move the fishing rod by rotating the stepper motor.
  • Today, we only offload the F1,2 GAS although the F3 exceed 30% of the limit DAC count (=32768) because we could not use the steppermotor of F3. This problem has been already reported in Oct 26 2019 (klog#11192). we should check it during the re-installation work.
  • We confirmed the saturated output signal was reduced in VIS_COIL_ALERT.adl.
  • Please see attached file. pic.1 and pic.2 are before and after this work, respectively.

Offloading procedure for VIS beginers (e.g. ITMX_GAS_F1)

  1. Trun OFF the output gain of the damp filter (e.g. K1:VIS-ITMX_F1_DAMP_GAS_GAIN). In order to avoid shaking by the offloading, if the output value in the output signal of the dampfilter (e.g. K1:VIS-ITMX_F1_DAMP_GAS_OUTPUT) exceeds 30000, please turn off the coil output gain (K1:VIS-ITMX_F1_COILOUTF_GAS_GAIN) before turning off the damp filter.
  2. Turn ON the GAS switch in "MOTOR CONTROL PANEL". you can open the pannel from upper right button in the tower overview.
  3. Start pcas for stepper motor control according to Wiki. ("ssh k1script" > "step_start ITMX_GAS")
  4. Move stepping motor while watching the input signal of the damp filter (e.g. K1:VIS-ITMX_F1_DAMP_GAS_INMON)
  5. After offloading the GAS, turn OFF the GAS switch.
  6. Stop pcas and exit k1script.
  7. Done.
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