KAGRA Logbook

Reports 1-1 of 1

VIS (IMM)

takafumi.ushiba - 10:20 Wednesday 03 August 2022 (21678)

IMMT1 pico channel was different from MEDM discription

I used picomotors for offloading IMMT1 and IMMT2 feedback signals and found that IMMT1 channel assign was opposite compared with MEDM screen (ch1 moves yaw and ch2 moves pitch).

IMMT1 Ch1: FWD -> -YAW
IMMT1 Ch2: FWD -> +PIT
IMMT2 Ch1: FWD -> -PIT
IMMT2 Ch2: FWD -> -YAW

Comments to this report:

tomotada.akutsu - 15:32 Wednesday 03 August 2022 (21679)

Yep, we already faced on this kind of similar channel assignment the other day... for STMs (21654).

koji.nakagaki - 15:49 Friday 05 August 2022 (21714)

[Ikeda, Nakagaki]

We checked the wiring of the driver at the site and found that the cables for ch1 and ch2 were plugged in incorrectly.
(cable 2 to port 1, cable 1 to port 2)
We corrected them to the correct connections.

There was a handwritten label on the cable, but it had almost disappeared, so the label was reattached.

Images attached to this comment

takafumi.ushiba - 20:09 Friday 05 August 2022 (21717)

I checked picomotor movement (only ch1) and confirmed pitch can be moved by using ch1 now.