Interlock Defeat

System(s) Affected:
Optics

Interlock to be Defeated:
All BL4 magnet power supplies

Implementation:	Number:
Date: 2001-06-04 Time: 22:30:00	2001-1
Implemented By: Kathleen Genge
In Consultation With:

Status: Removed

Estimated Duration:
104 weeks

Reason for Defeat:
All power supplies de powered and power supply cooling reduced to minimal flow.

Number of Yellow Tags:
1

Location of Defeat Tag(s):
DCR defeat board

How Was Defeat Implemented?
Where is Defeat Located?:
All power supply cct breakers off, all power supply main panel cct breakers off, power supply cooling valved down at each power supply, not at main header. Various locations.

Describe Alternate Protection:
flow switches. Defeat can be retired when all old BL4 power supplies removed/decommissioned and/or replaced/recommissioned for 4N.

Fault Reports:

Work Permits:

Disables:

Interlock Defeat

Removal:	Number:
Date: 2020-11-04 Time: 13:15:00	2001-1
Removed by: Frank Hosta

Status: Removed

Interlock Verification Method:
BL4 power supplies decommissioned.

Number of Tags Removed:
1

Comments:

Frank Hosta: 2022-02-07 07:32:22.033532
Also see disables #4951 and 5162.
Kathleen Genge: 2020-11-04 13:12:35.553401
4AQ6 local S/R valved off - 30/Aug/07 - comment by A.F.
BL4V power supplies locked out by Beamlines as per defeats 4951, 5162 - comment by KG, June 29, 2016
Old paper defeat #3542, Gord Roy