OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 37
3-1 PRELIMINARY CHECKS
3-1 PRELIMINARY CHECKS
<Caution against misoperation>
This cryocooler (cold head, compressor unit, compressor adsorber, flex lines) is shipped with a
helium gas at about 1.62 MPa (16.5 kgf/cm
2
G, 235 psig) sealed in. Be sure to adjust the
pressure to an appropriate value according to the cold head used before operating the
equipment. Using the cryocooler at an improper pressure may cause misoperation.
The coldhead employs the special seal to the 2nd stage. The 2nd stage displacer is fit tightly in
the cylinder. Make sure the 2nd stage temperature is less than 28 deg.C before starting up the
cryocooler, or the coldhead may make grinding noise.
“IMPORTANT”
This cryocooler is provided with a phase reverse protection circuit for the input power. If the input
power is connected with reverse phase, the cryocooler does not start.
Prior to starting Cryocooler, confirm that the Compressor Unit and the Cold Head are installed correctly as
described in Section 2.
CHECKING HELIUM GAS PRESSURE
Make sure that the static pressure is specified value with supply pressure gauge of the Compressor
Unit.
The static pressure needs to be adjusted for Cold Head as described follows;
COLD HEAD MODEL STATIC PRESSURE
RDK-408D2 4K Cold Head
RDK-408D 4K Cold Head
RDK-415D 4K Cold Head
1.60 - 1.70 MPa at 20 deg.C (68 deg.F)
(16.3 - 17.3 kgf/cm
2
G, 232 - 246 psig)
RDK-408S2 10K Cold Head
RDK-408S 10K Cold Head
RDK-400B Single Stage Cold Head
1.45 - 1.55 MPa at 20 deg.C (68 deg.F)
(14.8 - 15.8 kgf/cm
2
G, 210 - 225 psig)
For RDK-408D2 & 408D & 415D For RDK-408S2 & 408S & 400B
CHECKING ELECTRIC POWER, VOLTAGE AND PHASE
Check the line to line voltage and confirm it is ±10% of the specified value to meet the specification
described in each “TECHNICAL INSTRUCTION” for Compressor Unit used.
Confirm the phase of Input power and cable with correctly wired.
CAUTION
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