LHC ARC Commissioning report during LS1 Agenda: VRGPE documentation (former VRJGE) Active Penning...

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


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


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.


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.


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


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


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



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




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


• 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


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


VRGPE (active gauges)


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


CRYO sector interlocks


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


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!


Fixed Pumping Groups VPGFA & B


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)


Thank you very much

Nikolaos ChatzigeorgiouTE-VSC-ICM

[email protected]

mailto:[email protected]

LHC ARC Commissioning report during LS1 Agenda: VRGPE documentation (former VRJGE) Active Penning...

Documents

Transcript of LHC ARC Commissioning report during LS1 Agenda: VRGPE documentation (former VRJGE) Active Penning...