(Travis S., Gerardo M.)
Pumpdown was started this morning, sorry no blowdown data. By the time I remembered to take the reading there was no more pressure inside the chamber. Travis connected all of the equipment while I wrestled with the viewport inspection.
Pumpdown was started without an issue. We started with the scroll pump from the super sucker 500, the scroll pump of the SS500 cart brought the pressure down to 3.7x10-01 Torr, then we switched the cart to start pumping with the turbo pump/scroll pump. We had one trip of the system, usually due to a time out, but it only took a restart of the turbo pump and the pumpdown to continue.
Unfortunately the pumpdown had to be stopped at 8:00 PM local time, with a pressure of 4.0x10-05 Torr, at that pressure the set points had not activated on the SS500 cart controller, the set points are hard set and can't be modified from the SS500 controller screen.
Pumpdown will be restarted tomorrow morning.
Note, on the attachment, regarding the screens, no set points for channel 1.
Pumpdown Update.
Last Tuesday, HAM1 pumpdown was stopped for a few minutes to move the SS500 cart, the cart was moved away from the -Y door to open up space for the table. After the relocation of the SS500 cart the pumpdown for HAM1 was restarted.
On Thursday we assisted Filiberto with the installation of a "split" cabling for the high voltage interlock at HAM1 gauge. Attached is a photo of the screen of the SS500 cart and its response to loosing gauge signal, the signal cable was removed from the vacuum gauge to install the "split". I set valve control to "open" and the override to "override" on the SS500 cart to prevent it from tripping, it worked. BTW, when the cart reported the Error-S it cleared the setpoints. Once the cable was restored and we had a signal at the SS500 cart, the setpoints were restored manually.
Pumpdown continues, pressure is currently at 2.77x10-06 Torr, attached is a trend of the pumpdwon pressure.
