40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Message ID: 3946     Entry time: Thu Nov 18 14:05:06 2010
Author: josephb, yuta 
Type: Update 
Category: CDS 
Subject: c1sus is alive! 

Problem:

We broke c1sus by moving ADC cards around.

Solution:

We pulled all the cards out, examined all contacts (which looked fine), found 1 poorly connected cable internally, going between an ADC and ADC timing interface card  (that probably happened last night), and one of the two RFM fiber cables pulled out of its RFM card.

We then placed all of the cards back in with a new ordering, tightened down everything, and triple checked all connections were on and well fit.

 

Gotcha!

Joe forgot that slot 1 and slot 2 of the timing interface boards have their last channels reserved for duotone signals.  Thus, they shouldn't be used for any ADCs or DACs that need their last channel (such as MC3_LR sensor input).  We saw a perfect timing signal come in through the MC3_LR sensor input, which prevented damping. 

We moved the ADC timing interface card out of the 1st slot  of the timing interface board and into slot 6 of the timing interface board, which resolved the problem.

Final Configuration:

 

 Timing Interface Board

Timing Interface Slot 1 (Duotone) 2 (Duotone) 3 4 5 6 7 8 9 10 11 12 13
Card None DAC interface (can't use last channel) ADC Interface ADC interface ADC interface

ADC

interface

None None None DAC interface DAC interface None None

 PCIe Chassis

Slot 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
PCIe Number Do Not Use 1 6 5 4 9 8 7 3 2 14 13 12 17 16 15 11 10
Card None ADC DAC ADC ADC ADC BO BO BO BO DAC DAC BIO RFM None None None None

Still having Issues with:

ITM West damps.  ITM South damps, but the coil gains are opposite to the other optics in order to damp properly.

We also need to look into switching the channel names for the watchdogs on ITMX/Y in addition to the front end code changes.

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