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Message ID: 28     Entry time: Monday, January 28, 2013, 16:28
Author: Keith C Ng 
Category: Primary Beamlines 
Type: Repair 
Subject: 1A triplet repair (ground fault) 

Rad survey map from last Friday (25 January) here.

 

Found exposed thermal switch cable in triplet service chase.

- Fibre glass outer sheath was damaged leaving 5" of exposed cable. See photo below.

- Cable found under corner of shielding block.

- Fixed with black electrical tape, each wire individually taped, 9 wires in total. See photo.

 

20130128_tripletrepair_IMG_0076.JPG20130128_tripletrepair_IMG_0096.JPG

 

Found Q15 thermocouples were touching water lines near yellow connector was exposed and contacting waterlines.

- Insulated with nomex paper to isolate wire/connector. See photo.

 

20130128_tripletrepair_IMG_0079.JPG20130128_tripletrepair_IMG_0081.JPG

 

Reconnected thermocouple from 2012 and jammed thermocouple head between water lines. See photo.

20130128_tripletrepair_IMG_0094.JPG

 

Wires were moved again to see if the resistance had changed after applying fixes. Resistance to ground stayed at 4.8 kOhm.

 

Triplet booster pump turned back on by R. Kuramoto and D. Preddy. No problems.

 

Q15 power supply was reconnected and tested to 800 A. Regulator voltage at 9 A, load voltage at 60 V.

- Ground fault interlock re-enabled by C. Yee in Q15 power supply.

- Ground current measured at 20 mV (through power supply ground shunt).

 

D. Preddy feels power supply is okay to operate. Power supply currently off and locked out, booster pump left on. Will prepare to restore service chase shielding and uncover triplet magnets to remove asymmetric steering wires.

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