The HR3 is the cryogenic system recovery compressor and collects helium from the liquefier dewars, the roots pump, and the superconducting magnet and compresses it, and sends it to the two storage tanks outside.
There are two three main components of the HR3 compressor:
1. QT portion (on top of Kaeser)
2. HR3 PLC Screen
3. Kaeser compressor
QT portion of the HR3
HR3 control box: normal operation configuration (06/16/2023)
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When monitoring the reliving cycle on the QT part we noticed that SV7 appears to open only when there is a load (black arrow in Kaeser screen) for a very short time relieving pressure on the buffer tank and then returns to idle (white arrow in Kaeser screen). We then changed the 'Edit SV7 idle behavior' on the HR3 screen to "SV7 stays closed when the compressor is in idle: NO". The default here is YES.
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We also switched the Kaeser from the default mode (Quadro) to the Dual. When we did this and switched the RL1 lever down the Kaeser relieving cycles also quit relieving. This is how we are running now, "Dual" with "SV7 stays closed when the compressor is in idle: NO".
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