RyutaroTakahashi - 09:40, Friday 07 April 2023 (3216)
Dry-pump failed
I found that the dry-pump (ACP15) in the south end has failed. I replaced it with the spare pump (DSP500).
Comments related to this report
RyutaroTakahashi - 16:20, Friday 07 April 2023 (3222)
Today, all (four) pump units along the south arm have failed. I supporsed that the dry-pump replaced yesterday in the south end faild at first, then other pumps also went to stop. The pressure of the arm duct increased to 20mbar. The dry-pump in the south end was broken with "ALM05 MP STEP", The other pump units were recovered. Since the pressure of the arm duct is too high, the GVs between the pumps and the duct are closed. It is necessary to evacuate the duct with the large RP so as to be lower than 0.1mbar.
RyutaroTakahashi - 17:13, Monday 10 April 2023 (3225)
I evacuated the duct with the large RP so as to be lower than 0.1mbar. After that, the GVs between the pumps and the duct were opened except for the south end.
RyutaroTakahashi - 16:42, Tuesday 11 April 2023 (3229)
I started the SIPs between the NM2 and the mid point in the south arm. The power supply #1 (DIGITEL MPC) drived "N-S P1" and "N-S P2", and the power suply #2 (DIGITEL 1500) drived "N-S P3"(photo) and "N-S P4". Applied voltag and current were changed as follows.
[Just after starting]
N-S P1
N-S P2
N-S P3&P4
Voltage [V]
5640
5510
5200
Current [mA]
4.3
9.6
5.4
[Ater 2 hours]
N-S P1
N-S P2
N-S P3&P4
Voltage [V]
5840
5810
5300
Current [mA]
0.6
1.4
1.7
RyutaroTakahashi - 11:33, Wednesday 12 April 2023 (3230)
I checked the voltage and curent in the SIPs today.
N-S P1
N-S P2
N-S P3&4
Voltage [V]
5890
5980
5400
Current [mA]
0.45
0.83
0.88
RyutaroTakahashi - 16:32, Tuesday 18 April 2023 (3233)
I started the SIPs between the EM2 and the mid point in the south arm. The power supply #3 (DIGITEL 1500) drived "N-S P5" and "N-S P6", and the power suply #4 (DIGITEL MPC) drived "N-S P7". Applied voltag and current were changed as follows.
[Just after starting]
N-S P5&P6
N-S P7
Voltage [V]
5000
5720
Current [mA]
20
4.4
[After 3 hours for P5&P6 or 1.3 hours for P7]
N-S P5&P6
N-S P7
Voltage [V]
5200
5980
Current [mA]
0.6
0.8
RyutaroTakahashi - 09:59, Thursday 20 April 2023 (3235)
I checked the voltage and curent in the SIPs today.
N-S P5&6
N-S P7
Voltage [V]
5200
5930
Current [mA]
0.2
0.4
RyutaroTakahashi - 13:56, Thursday 27 April 2023 (3244)
I started the SIP "N-S P8" near the south end. Applied voltag and current were changed as follows.
Today, all (four) pump units along the south arm have failed. I supporsed that the dry-pump replaced yesterday in the south end faild at first, then other pumps also went to stop. The pressure of the arm duct increased to 20mbar. The dry-pump in the south end was broken with "ALM05 MP STEP", The other pump units were recovered. Since the pressure of the arm duct is too high, the GVs between the pumps and the duct are closed. It is necessary to evacuate the duct with the large RP so as to be lower than 0.1mbar.
I evacuated the duct with the large RP so as to be lower than 0.1mbar. After that, the GVs between the pumps and the duct were opened except for the south end.
I started the SIPs between the NM2 and the mid point in the south arm. The power supply #1 (DIGITEL MPC) drived "N-S P1" and "N-S P2", and the power suply #2 (DIGITEL 1500) drived "N-S P3"(photo) and "N-S P4". Applied voltag and current were changed as follows.
[Just after starting]
[Ater 2 hours]
Current [mA]
I checked the voltage and curent in the SIPs today.
I started the SIPs between the EM2 and the mid point in the south arm. The power supply #3 (DIGITEL 1500) drived "N-S P5" and "N-S P6", and the power suply #4 (DIGITEL MPC) drived "N-S P7". Applied voltag and current were changed as follows.
[Just after starting]
[After 3 hours for P5&P6 or 1.3 hours for P7]
I checked the voltage and curent in the SIPs today.
I started the SIP "N-S P8" near the south end. Applied voltag and current were changed as follows.
[Just after starting]
[After 3 hours]