UI indicates “Cryocooler
Disconnected”
Power dropped out with compressor or
communication lost
Check cable and power
connections. See Power and
Communication Issues on page
58.
Check the EVENT LOG in the UI
MENU for any fault messages.
Compressor display screen
blank
System Halted | Pressure
Imbalance
Helium hose not completely connected
Check the hoses for leaks. See
Helium Hose Fittings on page
64.
Occurs when the return pressure is
below its minimum value of 0.35MPa.
The likely cause for this is the cryocooler
stopped running or the return line is
detached.
Check the connection on the
return line and ensure the
cryocooler is running
Occurs when the supply pressure
exceeds 2.75MPa. It is caused by similar
conditions as the Return Pressure Too
Low fault – the cryocooler stopped
running or, in this case, the supply line
is detached. In general, the Return
Pressure Too Low fault will occur before
this fault.
Check the connection on the
supply line and ensure the
cryocooler is running.
Occurs when the difference between the
supply and return line pressures falls
below 0.3MPa. A problem occurred in
the cryocooler causing the supply and
return lines to approach a common
value.
Check that the supply and
return lines are attached
correctly and not switched. If
the compressor was running
and stopped it will need time
to rebalance the pressures.
Occurs when the capsule temperature
exceeds 85⁰C. This could indicate
improper oil flow or helium flow. It
could also be caused by vents on the
compressor being blocked.
Check that air flow through
the compressor is not being
inhibited by any external
object.
Occurs when the Cool Helium
temperature exceeds 50⁰C. Like the
capsule over temperature fault, this is
likely due to insufficient air flow through
the cooling system.
Check that the compressor
vents are clear of debris or
impedances and that the fan
is running.
Occurs when the exhaust temperature
of the cooling system exceeds 55⁰C.
Check that the compressor
vents are clear of debris or
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