HR3 operations

1) Turning OFF: Push this circular knob (red)

2) To Restart:

1) Rotate the same circular knob like half a turn clock-wise then it will be released (see the picture above)
2) Press the red button on the (right hand) panel to clear the alarm → HR3 will automatically start afterward.
   

Reasons for automatic turn-off, and how to restart.

1. If outside tank pressure > 120 psi.
   This can happen when performing a magnet fill which cause capturing boil-off helium with a faster rate. Therefore, checking the outside tank pressure before a magnet fill is necessary.
   Avoid the outside tank pressure reaching 120 psi, by
   i) Venting gHe from the outside tank when it is around 110 psi or below.
   ii) Liquefaction
   If it happens, then perform (i), then unplug/plug Kaeser Compressor (NOT HR3 power plug), or wait for a couple of hours to let the Kaeser Compressor to start automatically.
2. If PC1 < 0.1 psi
   This 0.1 psi can be changed using the ProSense cube on the HR3.
3. If the buffer tank pressure (VSWR) doesn’t increase by 1 psi within a sample time of 10mins.
   This is a setting on the LCD panel on HR3
   Press F5, and then Press F1 to navigate to that screen, then use F3/F4 to increase/decrease value.
4. If the compressor (Kaeser) did many starts in a short period of time (6 + / hour).
   If this happens, then unplug/plug  the HR3 power, then it will start automatically.
5. If there is an alarm on Kaeser compressor.
   In this situation, Kaeser compressor’s screen needs to be checked.