CDS Maintenance Summary: Tuesday 21st April 2026

WP13187 restart h1ioplsc0 to fix timing issue.

Dave:

At 09:55 h1ioplsc0 (and therefore all models on h1lsc0) was restarted to see if this would clear up the recent spate of IOP timing glitches seen in the past week. So far, so good.

WP13180 h1susauxb2h34 model, add LO1,2 voltage monitors

Jeff, Oli, Erik, Dave:

A new h1susuaxb2h34 model was installed which reads the newly installed 9th ADC for LO1,2 voltage monitor signals. A DAQ restart was required.

New h1spih23 model

Jeff, Dave:

We installed a new h1spih23 model which added 4 slow channels, REF/MEAS CONSCALE for A/B. A DAQ restart was required.

WP13186 h1guardian1 upgrade to Debian 13

TJ, Erik:

h1guardian1 was upgraded to Debian13. This was a from-scratch install using new boot drives. Puppet did a lot of the configuration but some hand editing was also needed.

DAQ Restart:

Erik, Dave:

The DAQ was restarted for the two model changes above. 

FW0 spontaneously restarted when FW1 had just got going.

NDS1 restarted at the time h1guadian1 was coming up, we assume that this was caused by a guardian NDS query storm.

FW2 has been down since 02:34 this morning and stopped updating around 05:02. At the time of the DAQ restart we found FW2 running again without no intervention. Following the DAQ restart FW2 died completely. I restarted rts-daqd_rs by hand, it kinda worked but seemed to be a whole full frame behind. So I stopped it for now.

WP13190 EY +24V Power Work.   WP13181 PCALY recovery

Erik, Marc, Fil, Tony, Dripta, Richard, Dave:

The cause of the PCALY trip during IO Chassis upgrades Thursday 9th April was tracked to a shared +24VDC power supply between h1seiey and the laser-interlock-chassis.

Fil and Marc moved the interlock power from this shared power supply to a safety-system PS.

This left two remaining issues with EY +24VDC power: h1iscey was not on the correct PS and the SEI-C1 was still supplying the BRS beckhoff mini-terminals.

We took care of the first item. Marc ran a long 24V power cable from the back of h1iscey IO Chassis to the SEI-C1 power strip (mirroring what was done at EX).

We recorded the current draw on all the power supplies before and after the change, and attempted to measure the current surge when h1iscey was powered up.

Here are the +24VDC currents recorded

+24VDC Power Supply	Powers:	Current Before	Current After	Power-On Current Surge
SUS-TC1,2	SUSEY, SUSAUXEY	5.0A	-	-
ISC-YC1, TCS-YC1	Beckhoff -[ISCEY]	9.0A	6.0A	-
SEI-YC1	SEIEY +[ISCEY]	3.2A	5.0A	6.0A (+1 A)

Note that the interlock had already been removed from SEI-YC1 at this time.

This just leaves the BRS Beckhoff terminals incorrectly attached to SEI-YC1, but their current draw sould be negligible.

Here are the EX current values for completeness.

+24VDC Power Supply	Powers:	Current
SUS-C2	SUSEX, SUSAUXEX	5.5A
ISC-C1	Beckhoff	5.0A
SEI-C1	SEIEX, ISCEX	6.0A