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Message ID: 14384     Entry time: Fri Jan 4 11:06:16 2019
Author: Jon 
Type: Omnistructure 
Category: Upgrade 
Subject: Vac System Punchlist 

The base Acromag vacuum system is running and performing nicely. Here is a list of remaining questions and to-do items we still need to address.

Safety Issues

  • Interlock for HV supplies. The vac system hosts a binary EPICS channel that is the interlock signal for the in-vacuum HV supplies. The channel value is OFF when the main volume pressure is in the arcing range, 3 mtorr - 500 torr, and ON otherwise. Is there something outside the vacuum system monitoring this channel and toggling the HV supplies?
  • Exposed 30-amp supply terminals. The 30-amp output terminals on the back of the Sorensen in the vac rack are exposed. We need a cover for those.
  • Interlock for AC power loss. The current vac system is protected only from transient power glitches, not an extended loss. The digital system should sense an outage and put the IFO into a safe state (pumps spun down and critical valves closed) before the UPS battery is fully drained. However, it presently has no way of sensing when power has been lost---the system just continues running normally on UPS power until the battery dies, at which point there is a sudden, uncontrolled shutdown. Is it possible for the digital system to communicate directly with the UPS to poll its activation state?

Infrastructure Improvements

  • Install the new N2 tank regulator and high-pressure transducers (we have the parts; on desk across from electronics bench). Run the transducer signal wires to the Acromag chassis in the vacuum rack.
  • Replace the kludged connectors to the Hornet and SuperBee serial outputs with permanent ones (we need to order the parts).
  • Wire the position indicator readback on the manual TP1 valve to the Acromag chassis.
  • Add cable tension relief to the back of the vac rack.
  • Add the TP1 analog readback signals (rotation speed and current) to the digital system.  Digital temperature, current, voltage, and rotation speed signals have already been added for TP2 and TP3.
  • Set up a local vacuum controls terminal on the desk by the vac rack.
  • Remove gauges from the EPICS database/MEDM screens that are no longer installed or functional. Potential candidates for removal: PAN, PTP1, IG1, CC2, CC3, CC4.
  • Although it appeared on the MEDM screen, the RGA was never interfaced to the old vac system. Should it be connected to c1vac now?
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