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Several problems were faced:
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YOU ARE VIEWING BlogEntryPoint8x2007x05x22x21x23
Powering Tests in Sector 7-8: activity of Tuesday 22/05.
The Powering to Nominal procedure was started fro the following circuits:| PNO.1 | PNO.2 | |
|---|---|---|
| RCBCH5.L8B1 | O | O |
| RCBCv5.L8B1 | O | O |
| RCBYH4.L8B2 | O | O |
| RCBYHS4.L8B1 | O | O |
- cryogenics instabilities which delayed the CRYO START signal:
- oscillating level on DFBMC
- high temperature on the first 6 kA in DFBMA (54 K)
- delay for PNO.2 step for RCBYH4.L8B2, whose origin was:
- hardware limitation of the PC, which blocked the cycle to 52 A; the PC went on fault and the current drop to zero (intervention of PO to remove the limitation)
- probably due to the problem just mentioned, a very long PM file was produced which was preventing the cycle from being restarted (manual reset of the PC was needed)
- RCBYHS4.L8B2 showed a possible NON-CONFORMITY: while preparing this circuit for PNO.1, a high voltage value was detected on a lead (250 mV); a verification of PO showed that this is probably due to an open voltage tap. The circuit has been removed from the SOC.
- continuation of tests on RCBCH5.L8B1, RCBCv5.L8B1, RCBYH4.L8B2 and RCBYHS4.L8B1;
- Powering to Nominal procedure for circuits RCBYV4.L8B1, RCBYVS4.L8B1 and RCBYVS4.L8B2;
- continuation of tests on Q4 and Q5 if released by MPP;
- continuation of tests on D2.
| RB.A78, RQF.A78 (?), RQD.A78 (?) | Powered by their own converter | DFBA, QPS, EE, PC, PIC Preparation (this week) |
| ARC @ 1.9K | ElQA @ 1.9K RB & RQD | |
| QPS Heater Discharge | ||
| PIC1 RB & RQF | ||
| Connection DC cable - lead | ||
| PC_CONFIG RQ - 350A | ||
| PIC 2 RQ - 350A | ||
| PC_CONFIG RB - 350A | ||
| PIC 2 RB - 350A | ||
| P2N RQ - Max 760A | ||
| P2N RB - Max 760A | ||
| Powered by a 120A converter | DFBA, QPS, EE, PC, PIC Preparation (this week) | |
| ARC @ 4.5K | PIC1 RB & RQD - Without Quench Heaters | |
| Connection DC cable - lead | ||
| PC_CONFIG RQ - 100A | ||
| PC_CONFIG RB - 100A | ||
| 600A Circuits - Priority 1, 25 Circuits | ARC @ 4.5K or 1.9K | DFBA, QPS, EE, PC, PIC Preparation (this week) |
| ElQA @ 4.5K-1.9K first Circuits | ||
| QPS Last Conditioning | ||
| PC_CONFIG first circuits | ||
| ARC @ Superfluid Helium | DFBA, QPS, EE, PC, PIC Preparation (this week) | |
| ElQA @ 4.5K-1.9K All Circuits | ||
| QPS Last Conditioning | ||
| PIC2 First Circuits | ||
| PCS First Circuits | ||
| PC_Config, PIC2, PCS rest of circuits - Parallel |
Edit | Attach | Topic revision: r1 - 2007-05-22 - MirkoPojer
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