18/12/13VF 1 Status of WIENER crates

NA62 WIENER crates 2 prototypes crates purchased in 2011 : o FE type: power supply LHC 9U, +/-12V 46A, 48V 13.5A, +3.3V 100A, +5V 100A,+/- 5V 30A. The crate is Frascati. Perfectly working after a series of reprogramming 12V -> 7.0V -> 7.2V ->7.5 V. Used as a test crate for all LAV FE boards. o TEL62 type: power supply LHC 9U, 48V 27A, +3.3V 100A, +5V 100A, +/-5V 100A. The crate is in Rome. No problem reported. 8 crates delivered in 2012 (all FE type) o Reprogramming of +/- 12V to 7.0V, then to 7.2V and at the end to 7.5V At the beginning by NA62 At the end by Elcotron VF2 18/12/13

Failures story. Fan-Trays VF3 18/12/13 UnitRackProblemRepairPaid by 0133SpareDoesn't react to ON/OFF switch (the crate stays OFF). « Dommage mécanique sur le switch ON/OFF » NA KTAG All lights are ON as soon as power cable is connected to mains. The fan tray doesn't react on switching the power supply ON or on ON/OFF switch on front panel of the fan-tray. Réparation sous garantieWIENER 0138 LAV1 Weak blast with some smokeWrongly mounted voltage regulator (too short distance between cooling tab and chassis) WIENER

Failures story. Power-Supplies VF4 18/12/13 UnitRackProblemRepairPaid by 0004KTAG The fan tray connected to this PSU gets all LEDs ON as soon as the mains power is connected Echange std de la carte MUH, d'un ventilateur de module et du switch I/O vert. WIENE R 0005? Cannot be controlled via the crate nor the RS232 line. The user wanted to set the output voltage to a different value and the PSU stopped to respond to the UEP6000 SW. Réparée la carte MUH (self L3). NA LAV3 The value of 3.3V increases continuously from 3.3 up the the security value 3.5V and then the crate is switched off by the security system. Réparé carte MUH self 18µH grillée NA LAV348 V -> 0 V around 3 min with or without the voltmeter 0009CHOD There is following sequence of the fan-tray display once the power cord connected to plug : UEP6000:2.22, CAN6.1, Plug $ Play error, PS incompatible, +5V0 low voltage, +12V0 low voltage, +48V0 low voltage, +3.3V0 low voltage, -12V0 low voltage and it is impossible to turn it ON. Changé la self 18µH sur la carte MUH NA LAV1Plug & Play error Replacement of SYSRESET transistor and 18µH inductor 0009PC farm A 3K3 resistor is installed in a free connector to pull-up the SYSRESET line to 5V. The voltage measured on the SYSRESET line is 0.3V, with or without the boards inside the crate.

VF5 18/12/13 L3 (18 µH), EEPROM and SYSRESET

VF6 18/12/13 SYSRESET and +12V Backplane lines

3 suspects: LAV FE (usually 5 boards in crate) – Mauro Raggi (Frascati) TEL62 (usually 1 board in crate) – Franco Spinella, Elena Pedreschi (Pisa) WIENER (Andreas Koester) VF7 18/12/13 SYSRESET investigation

3 reactions : VF8 18/12/13 3 participants: LAV FEAll the 26 FEE boards that are now sitting at CERN have been tested for all their functionalities inside the crate which is sitting in Frascati for at least 30 minutes without any problem. Alibi ? TEL62The SYSRESET part of the board is a replica of TELL1 design. We had so far a couple of boards in which SYSRESET receivers were found blown (protection diodes were not mounted), the last being the one which was plugged in the crate which developed problems on such line during the dry run. WIENERStandard WIENR power supplies used in NA62 crate. The only possible reason for the destroyed transistor is connection of this SYSRESET signal to some other voltage via electronics plugged into the backplane

VF9 18/12/13 Analysis of the Burned Inductor at MUH Problem (WIENER)

VF10 18/12/13 SYSRESET investigation: capacitors on backplane There is a capacitor drawn in the schematic (C50), between SYSRESET and another voltage rail. We double-checked: This capacitor is not assembled, which is OK. (My thought was charging this 470uF capacitor could damage the transistor at the MUH). From: Andreas Koester Sent: 26 November :40 To: Vincent Bobillier

VF11 18/12/13 SYSRESET investigation: capacitors on backplane From: Andreas Koester Sent: 29 November :59 To: Vincent Bobillier The SYSRESET is the trace from left to right (see arrows left & right, "Bottom Side.jpg"), and no capacitors there. Below the SYSRESET there are the three smaller traces for +12V/0V/-12V, which do have capacitors. You can see there is no connection to the SYSRESET

Crate validation tool and procedure Rationales : o Functions provided by a crate are rather simple: Voltages/currents SYSRESET o The functions are static (under assumption of absence of an element failure) Procedure o Prepare a simple test tool (Riccardo – beginning of January) o Check all crates without boards VF12 18/12/13

3 suspects : VF13 18/12/13 3 participants: Exculpatory evidence LAV FEAll the 26 FEE boards that are now sitting at CERN have been tested for all their functionalities inside the crate which is sitting in Frascati for at least 30 minutes without any problem. Alibi ? TEL62The SYSRESET part of the board is a replica of TELL1 design. We had so far a couple of boards in which SYSRESET receivers were found blown (protection diodes were not mounted), the last being the one which was plugged in the crate which developed problems on such line during the dry run. WIENERStandard WIENR power supplies used in NA62 crate. The only possible reason for the destroyed transistor is connection of this SYSRESET signal to some other voltage via electronics plugged into the backplane Validation

What about TEL62 (personal proposals)? Create and keep record of all boards movement from one crate to another Systematically check all boards for unwanted contacts (with record of observation) – can Pisa group do it? Abandon SYSRESET circuit and use crate OFF/ON instead VF14 18/12/13

Other direction of investigation: electrical network VF 15 18/12/13 Figure 1 enregistrement des tensions simples des 3 phases (valeurs efficaces) Noir = phase 1-neutre Rouge = phase 2-neutre Bleu = phase 3-neutre 11:50 (coupure générale CERN) 19/07 après-midi (8 événements) 15:00 13:30 et 13:40 A lexception des creux de tension signalés sur la Figure 1 et commentés ci- après au § 2.1.3, les 3 tensions simples sont en moyenne à 228 V, avec un maximum à 242 V pour V1 (phase R). Ces valeurs et nappellent aucun commentaire particulier et ne posent aucun problème. Paramètres denregistrement des tendances : Courants, tensions, Puissances, facteurs de puissance, harmoniques Durée : 14 jours Intervalle de moyennage/min/max : 10 minutes. Conclusion Les perturbations relevées (creux de tension dune durée de quelques périodes réseau, ou déformations oscillatoires de londe sinusoïdale, ou pics transitoires rapides) ont une cause externe au Canalis, à chercher sur la distribution amont (… plutôt des manœuvres exécutées par un automatisme de régulation) Un certain nombre de problèmes peuvent également être corrélés aux orages survenus sur le secteur de Genève durant la période de mesure.

What else? Connection of all 3 grounds: o From: Vincent Bobillier Sent: 13 November :22 During the last phone conference (on October 23), what I learned already from Andreas Koester is that he recommends not to run the VME PSU with the different grounds not connected together. Andreas clearly said that these PSUs are not designed to operate in such a floating grounds setup. Thus it is recommended to interconnect these grounds via the backplane jumpers or via the modules inserted in the VME card- cage. Systematical test of the crates after new board insertion (the problem manifests itself only at crate re-start) Check of grounding issues (in particular in LAV racks) …. VF 16 18/12/13