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LHC ARC Commissioning report during LS1
Agenda:• VRGPE documentation (former VRJGE)
• Active Penning modification• By-Pass Valves modification
• LHC ARC commissioning report
Nikolaos Chatzigeorgiou, FELL, November 2014
VRJGE documentation• Investigation - documentation for VRGPE, ND100
• ND100 wire identification• VRGPE inside connections• Overall architecture (Magnet, QRL, Beam lines)• Generic VRJGE layout• Connection schema VRJGE-PLC
Nikolaos Chatzigeorgiou, FELL, November 2014
VRGPE investigation
• Investigation to overcome normal operation problems• Signal integrity investigation (proposal of 4-20 mA)• Behaviour understanding + schematics• Influence between different gauges• For the pennings, the major problems are divided in 4
categories:• DC Common Mode voltage• Analog Ground influence on the output voltage• ON/OFF “oscillation” when Over Range• AC noise captured by PVSS
Nikolaos Chatzigeorgiou, FELL, November 2014
Active Penning modification
The modification of the Penning grounding schematic targeted to overcome the DC common mode voltages appearing in the PLC input due to very long cable distances and current consumption. Thus forcing the PLC to ERROR state and affecting nearby gauges, as we can see in the above figure from ARC 34.
Nikolaos Chatzigeorgiou, FELL, November 2014
DC Common Mode VoltageVGP ground was different from PLC input ground
Solution:
Extra parallel wires for all the penning power supply grounds. The goal is to keep CMV less than 1V on a 50mA consumption. Thus, less than 20Ω linear resistance for each penning ground.
Results:
All ARCs are cold by now and all the penning equipment is running OK.
Nikolaos Chatzigeorgiou, FELL, November 2014
PLC_2VPG_RE No 59210 meters
SM322 (32xDO)
+24V 28L4
+
-
+
-
+
-
SM331 (8xAI)
Alcove RE42
Tunnel LHC
Isol
ation
gal
vani
que
Mana
Terre Racks Alcove
Carte EDA-00201
Boitier PKR251
+
-
Tête
de
jaug
e PK
R251
Coax
Pirani
Penning
Terre machine
2
3
5
4 +24v
10
103
2
Jaug
e Pi
ezo
Hub
a 68
0
+ V
-V
1
4
2
3
Box VRJGE.A28L4.Q8650 meters
Out
Born
ier
10K
4
5
+
-
+
-
+
-
+
-
+
-
Carte EDA-00201
Boitier PKR251
+
-
Tête
de
jaug
e PK
R251
Coax
Pirani
Penning
Terre machine
2
3
5
4 +24v
10
103
2
Box VRJGE.A32L4.Q8450 meters
10K
4
5
+24V 32L4
DC+24V
ND100Rwire+~ 54 Ω
Penning Load
480 Ω
ND100Rwire GND
~ 54 Ω
50mA
Alcove Earth
Chassis
Penning Power Supply equivalent circuit, resistances for 800m ND100 cable (VRJGE.32Lx.Q)
Active Penning modification
Nikolaos Chatzigeorgiou, FELL, November 2014
PLC_2VPG_RE N°3
VED-130801
Bornier 2 VY02
ALCOVE REx8
VRJGE.A26Rx
47
48
VRJGE.A28Rx
47
48
PLC_2VPG_RE N°4
VED-130801
VRJGE.A31Rx
81 81
47
48
Cable 2 ND100
PS Penning GND
PS Penning +24V
67
68
84
Cable 2 ND100
67
68
84
67
68
84
GA
UG
ES
-A
28SM
18
19
20
21
INP
UT
S
11
12
10
19SM
GA
UG
ES
-A
28SM
18
19
20
21
GA
UG
ES
-B
28SM
18
19
20
45
46
83
45
46
83
45
46
83
82 82
81
82
47
48
81
82
Cable 2 ND100
57
58
80
57
58
80
PS Penning GND
PS Penning +24V
PS Penning GND
PS Penning +24V
PS Penning GND
PS Penning +24V
95
96
97
98
99
100
95
96
97
98
99
100
95
96
97
98
99
100
95
96
97
98
99
100
PS Penning GND
PS Penning +24V
PS Penning GND
PS Penning +24V
By-Pass Valves Installation - modification
• Modification PLC crates in RE28 and RE32. 7 crates are modified
• Installation MCA8 cable in VRGPE boxes. 7 cables in sector 23
• Connect valves in sectors 23, 78, 81. Total 21 valves• MCA8 cable modification in sector 23 due to
different distance between RE32 and VRJGE• ND100 wires modification for less drop for all LHC
Nikolaos Chatzigeorgiou, FELL, November 2014
By-Pass ValvesInstallation - modification
• Worst case 11V arriving on the valve – long cables• Valve can actuate with at least 13V (6 bar air)• Cabling modified to increase voltage on the valve
Nikolaos Chatzigeorgiou, FELL, November 2014
By-Pass ValvesInstallation - modification
Bornier 1 VY02
ALCOVE REx8
VRJGE.A32Rx
VRJGE.A33Rx
VRJGE.A34Lx
Cable 1 ND100
62
61
62
63
64
65
66
63
64
65
66
67
68
61 Coil GND
Coil +24V
Status OPEN +24V
Status OPEN GND
Status CLOSE GND
Status CLOSE +24V
PLC_2VPG_RE N°3
VED-130801
48SF
VP
G-B
34
35
36
33
37
38
Cable 1 ND100
61
62
63
64
65
66
60
59
60
59
60
59
69
70
71
72
73
74
67
68
69
70
71
72
73
74
67
68
69
70
71
72
73
74
Cable 1 ND100
Nikolaos Chatzigeorgiou, FELL, November 2014
By-Pass ValvesInstallation - modification
Nikolaos Chatzigeorgiou, FELL, November 2014
Equipment Total Pairs Pairs added Min Voltage [V]
Max Voltage [V]
Mean Voltage [V]
VVACH.11Rx.M 6 3 15.9 18.9 16.6
VVACH.19Rx.M 4 2 18.6 20.6 19.3
VVACH.27Rx.M 4 2 15.6 17.2 16.1
VVACH.33Rx.M 6 3 16.3 16.9 16.5
VVACH.27Lx.M 4 2 14.2 16.8 15.5
VVACH.19Lx.M 4 2 18 19.7 19.1
VVACH.11Lx.M 6 3 15 18.7 16.7
LS1 LHC ARC Commissioning
Nikolaos Chatzigeorgiou, FELL, November 2014
• Green Team:• Henrik Vestergard, TE-VSC-ICM• Nikolaos Chatzigeorgiou, TE-VSC-ICM
• Target: • VPGFA & VPGFB• By-Pass valves• All active gauges in VRGPE (former VRJGE)• CRYO sector interlocks
LS1 LHC Commissioning
Nikolaos Chatzigeorgiou, FELL, November 2014
LSS+ARCsCheck in VAC
PVSSVerified by CRYO tem
CRYO sector alarms
Valve actuation
Primary Pumps
Turbo PumpsRemote Control
VPGF
Valve actuation
Voltage dropRemote Control
By-Pass
1 position simulator
HV component
testRemote Control
Active VGP
3 positions simulator
Calibration
Active VGR
2 positions simulator
Active VGM
ModificationsTerminal
connections verification
Alcove + Equipment
Cabling
LS1 LHC ARC Commissioning
VRGPE (active gauges)
Nikolaos Chatzigeorgiou, FELL, November 2014
824 actives gauges from all LHC ARCs commissioned• 74 active Pirani calibrated out of 328 (23%) • 14 active Pirani Hirschman connectors badly installed (4%)• 1 active Pirani changed the OP Amps• 5 active gauge sensors not working (documented)• 1 active Piezo connector badly installed (gauge side)• 3 active Penning HV component low (2kV instead of 3kV) out
of the 328 (1%)• 1 active Penning IKR251 found dead and replaced
LS1 LHC ARC Commissioning
CRYO sector interlocks
Nikolaos Chatzigeorgiou, FELL, November 2014
All CRYO interlocks for the whole LHC tested and confirmed• Interlocks are tested using local gauge simulators• Tested using the VAC PVSS –Verified by CRYO teams• 3 interlocks crossed in LSS1R (CRYO rack relocation in RB16)
• LSS12_01R1_VACM_NLOST crossed with LSS12_05R1_VACM_NLOST• LSS12_04R1_VACM_NLOST crossed with LSS12_06R1_VACM_NLOST• LSS12_0104_VACM_OK Crossed with LSS12_0506_VACM_OK
• 3 interlocks had software problem in VAC PLC and updated• LSS56_secA_VACQ_NLOST• LSS56_secA_VACQ_OK• LSS56_secBA_VACQ_OK
• DSL line in P3, needs hardware and software revision• Missing controller for Piezo - to be installed• New software logic for the first 2 triplets – to be implemented
LS1 LHC ARC CommissioningBy-Pass Valves
Nikolaos Chatzigeorgiou, FELL, November 2014
56 By-Pass Valves from all LHC ARCs tested• Tested using valve simulator which includes the same coil as the
valves, for realistic voltage drop• When pressure right & left was good, the real valve was tested
• 1 problem coming from the PLC in the Alcove, the +24V wire feeding the coil was not working good and replaced
• The VVACH.484.19R2.M had NO compressed air installed and repaired by Ludovic Mourier
• The VVACH.521.27L4.M valve, after modification, has a critical coil voltage of 14.2V - it may affect the actuation of the valve – action should be taken!
LS1 LHC ARC Commissioning
Fixed Pumping Groups VPGFA & B
Nikolaos Chatzigeorgiou, FELL, November 2014
96 Pumping Groups from all ARCs commissioned• 3 Power Supplies changed• 1 Turbo Pump changed – could be more but not documented• 3 LOC_1VPG_RE changed (1 out of 3 the transistor was dead)
Conclusions and Future work• The LHC ARC commissioning accomplished in schedule
• Many problems with the active Pirani cards, especially with the calibration procedure
• Until week 49, all the documents should be updated (final documents for VRJGE, commissioning reports, etc.)
• Discussion – Investigation - Prototyping to upgrade the active gauge electronics in the ARCs
• Design new Pirani PCB & Penning PCB with a better calibration procedure and more trustful pressure readout (based on the TPG300 model?)
• Design stage to convert the 0-10V to 4-20mA in order to have info in case of power cut and better signal integrity
• OR integrate stage for direct ADC and communication through PLC protocol (standard radiation tolerant electronics existing at CERN)
Nikolaos Chatzigeorgiou, FELL, November 2014
Thank you very much
Nikolaos ChatzigeorgiouTE-VSC-ICM
Nikolaos.Chatzigeorgiou@cern.ch
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