Status of PDS A.Lebedev MIT AMS TIM Meeting, Houston, January 2007

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3 PDS EM “History” Produced and tested at CGS Moved to ETHZ and tested Now at CERN for software development (Shoudong Xu) While at CERN some “random” tests done: –Inrush current measurement with TPD –Inrush current measurement with TTCE load –Short circuit protection investigations…

4 PDS Testing at ETHZ (1) TEST REPORT The Engineering Model of the AMS Power Distribution System (PDS-EM) K.S. Kim (EWHA & ETH-Z) and M. Capell, A. Lebedev, A. Koulemzine (MIT) V. Commichau, HP. v. Gunten, U. Röser, G. M. Viertel (ETH-Z) S. Alia, C. Pini (CGS) M.W. Lee (KNU & ETH-Z) ETH-Z, March 2006

5 PDS Testing at ETHZ (2) CAN I/F: –CAN bus connection between 2 connectors –CAN I/F have wrong latchup protection –CAN I/F 31 internal DC/DC converter broken Input Section telemetry calibration 20% off ESEM3B (120V): –Status readout errors –Telemetry calibration 50% off –Outlet 8 fuse blown during short circuit test

6 PDS Testing at ETHZ (3) PB2-1 (120V to 28V DC/DC converter): –Telemetry calibration 50% off PB2-2 (120V to 28V DC/DC converter): –Telemetry calibration 50% off PB2-3 (120V to 28V DC/DC converter): –Status readout errors –Telemetry calibration 50% off PB2-4 (120V to 28V DC/DC converter) was shipped to CGS for repair. CGS found a broken line on the PCB and an incorrectly mounted MOSFET.

7 PDS Testing at ETHZ (4) PB2-1 (120V to 28V DC/DC converter): –Telemetry calibration 50% off PB2-2 (120V to 28V DC/DC converter): –Telemetry calibration 50% off PB2-3 (120V to 28V DC/DC converter): –Status readout errors –Telemetry calibration 50% off PB2-4 (120V to 28V DC/DC converter) was shipped to CGS for repair. CGS found a broken line on the PCB and an incorrectly mounted MOSFET.

8 PDS Testing at ETHZ (5) ESEM3A-1 (28V): –Status readout errors –Telemetry calibration 50% off –Outlet 1 always on, was sent to CGS, short was found later in PDS cabling. ESEM3A-2 (28V): –Status readout errors –Telemetry calibration 50% off –Outlet 3 always off, was sent to CGS bad soldering of the component ‘U10’ was found.

9 PDS Testing at ETHZ (6) ESEM3A-3 (28V): –Status readout errors –Telemetry calibration 50% off ESEM4A-3 (28V): –Status readout errors –Telemetry calibration 50% off ESEM1A (PDS INTERNAL POWER): –Status readout errors –Telemetry calibration 50% off –Was sent CGS for repair. After repair shows same behavior as before

10 PDS Testing at ETHZ (7) Additional Observation When the ESEM1A, ESEM3A-1 and ESEM3A-2 came back from repair at CGS, all boards were installed in the PDS. The ESEM3A-1 and ESEM3A-3 disabled the FPGA of PB2-3 and PB2- 4 functioning and the outlet ON/OFF command provoked a PDS "suicide" for unknown reason. All boards, except for the CAN I/F (#30), were moved to the B-side and the same abnormal behavior was found. Removing the ESEM3A-1 and ESEM3A-3 solved the problem.

11 PDS Testing at ETHZ (8) Found 32 issues in total Corresponding NCRs were sent to CGS After repair almost all boards are OK

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17 REMAINING TESTS TO BE DONE Thermal Interlock Circuit Test Inrush Current Measurement Temperature Telemetry Calibration of Each Board EMI Test Magnet Field Test CAN BUS I/F Verification PDS Power Characterization Test for Case J,K,L (CGS, refer to the chapter 15)