Interlock Defeat

System(s) Affected:
Ion sources and injection BL

Interlock to be Defeated:
EGUN:BIAS and EGUN turbine warn/trip alarm levels

Implementation:	Number:
Date: 2024-05-28 Time: 14:00:00	2024-277
Implemented By: Brandon Humphries
In Consultation With:

Status: Removed

Estimated Duration:
20 weeks

Reason for Defeat:
The replacement RUG3 for the EGUN turbine has an offset of about 0.5 V compared to the previous one. So the interlock and alarms (warn/trip) needed to be lowered by 0.5 V until a new RUG3 is obtained. Warn level lowered from 22.5 V to 22.0 V and trip level lowered from 22.0 V to 21.5 V.

Number of Yellow Tags:
2

Location of Defeat Tag(s):
1- ERSS panel blue box

1- Cork board in back of DCR

How Was Defeat Implemented?
Where is Defeat Located?:
Changes were implemented through the PLC by Controls (alarms are filtered through a secondary signal).

Describe Alternate Protection:
Protection still exists, just with the offset corrected. System expert (Marco) approved the change.

Fault Reports:
16934

Work Permits:
A2024-05-28-2

Disables:

Interlock Defeat

Removal:	Number:
Date: 2024-07-03 Time: 14:15:00	2024-277
Removed by: Brandon Humphries

Status: Removed

Interlock Verification Method:
Controls reverted to the original alarm levels under WP#A2024-07-03-2. Alarm levels were confirmed by forcing the value of EGUN:BATVOL through the PLC (for details see e-log thread https://web.accel.triumf.ca/elinac_elog/Elog_show_result.pl?inid=55406&style=thread&timemode=eventtime).

Number of Tags Removed:
2

Comments: