C30HVRT Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED
5-1
Section 5 Operation
5.1
Verification of helium static pressure .................................................... 5-1
5.2 Compressor operation .......................................................................... 5-2
5.3 Inspection after replacing helium circulation components .................... 5-5
5.4 Precautions for when compressor is not in operation .......................... 5-5
5.5 Maintenance operation for a compressor stopped for a long
period .................................................................................................... 5-5
5.1 Verification of helium static pressure
Before starting the system operation, verify the helium static pressure.
Main components that make a system such as a compressor, flexible hoses, and a
cryocooler have been charged with helium gas before they are shipped from the factory.
However the helium pressure may be changed at the time of connecting the components.
Pressure verification procedure is shown below.
1. Stop the compressor if it is in operation and wait until the whole system has reached to
the room temperature (It will take about three hours if the compressor has just been
stopped).
2. Ensure that the flexible hoses between the compressor and the cryocooler are
connected properly.
3. See Figure 5-1 and check the proper helium filling pressure value at the actual room
temperature.
4. Make sure that the helium pressure shown in the high-pressure side pressure gauge on
the front panel is in the range of ±0.04MpaG to the above proper value.
It is possible to start operating the compressor when the helium filling pressure is in the
proper range. If it is out of range, see “Section 7.3 Adjusting system helium pressure”
and adjust it.
Improper helium pressure may make the performance unstable, shorten the compressor
motor life, and/or cause malfunction of the product.
CAUTION
If the helium filling pressure is higher than the set pressure for the pressure relief valve
described in Appendix D, the pressure relief valve of the compressor or refrigerator may vent
the surplus helium gas.
the pres re relief valve blows, stop the operation and leave the compressor for several
ours to ensure that the helium filling pres nge which can be still operated. If
e helium llin
If su
h sure is in the ra
th fi
ressure is reduced,
lease contact us for maintenance.
CAUTION
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