Sumitomo SRDK Series - 3-2 START-UP OPERATION

OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 38
3-2 START UP
3-2 START-UP OPERATION
<Caution against misoperation>
The cryocooler ON/OFF frequency must be less than 6 times per hour, and the ON/OFF interval
must be more than 3 minutes. The frequent ON/OFF operation may result in damage of
compressor capsule or malfunction.
The cold head drive switch provided with the compressor unit is only used for maintenance. Be
sure to turn it OFF in normal operation. Using the compressor unit with the cold head drive
switch turned ON may result in misoperation or malfunction.
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.
Start up the Cryocooler as mentioned below;
1） Make sure that the pressure gauge of the Compressor Unit is indicating correct static pressure of
your system with supply pressure gauge.
2） Check the setting of “Drive Switch”, “Cold Head Drive Switch” and “Remote Drive Switch”.
“Drive Switch” --- OFF Position
“Cold Head Drive Switch” --- OFF Position
“Remote Drive Switch” --- INT Position (for Water Cooled Compressor Unit only)
3） Turn on the "Main Power Switch".
For Air Cooled Compressor Unit For Water Cooled Compressor Unit
4） Turn on the “Drive Switch”.
For Air Cooled Compressor Unit For Water Cooled Compressor Unit
CAUTION