Virgo Logbook

AdV-PAY (Payloads Control)

Sposito, Montanari, Boschi, Carbognani - 17:06 Monday 22 July 2019 (46451)

Installation of the Marionetta relay boxes NI and WI

Today, we have installed 2 dedicated relay boxes for the Marionetta; 1 at NI and 1 WI. For each tower, we used the 2 channel CH.MA.L and CH.MA.R. on both towers. As requested by the commissioning crew, it is now possible to open the Z coils of the Marionetta of both towers.

For space reason, the 2 boxes were installed on the back of the left rack (motors rack), in the attachment the picture of the 2 new boxes.

The commanding of those 2 boards were already integrated in VPM as additional CoilRelay servers instances:

CoilSbMARNI
CoilSbMARWI

with the same set of commands available for CoilSbNI/WI

At Automation level we have:

modified the sb_high_power() function inside META_library. to add the CoilsSbMARNI/WI commanding (this is called while going into DOWN)
added the dedicated function sb_mar_open() inside META_library wich is then called in the ITF_LOCK node within the ACQUIRE_LOW_NOISE_3 state.

Images attached to this report

Comments to this report:

Boschi, Ruggi - 0:19 Tuesday 23 July 2019 (46457)

Additional details of the intervention:

Marionette driving matrices of both NI and WI had to be changed since the two coils attached to the newly installed relais boxes were also used for ty control.
No significant changes were observed in the sensitivity curve, at low frequency, as expected by the actuator noise projections.

Boschi - 0:20 Wednesday 24 July 2019 (46469)

The installation implies that, as communicated to the operation team, in case of earthquakes, before applying the relative procedure, both the relais boxes should be put in HighPower mode manually in the VPM.