Olicom 9600 - Manual (Page 40)

9600 Compressor Installation, Operation, and Maintenance
P/N 8040540 4-1
C
HELIX TECHNOLOGY CORPORATION
- TI CRYOGENICS
Section 4 - Operation
Adjusting System Helium Pressure
Your CTI-CRYOGENICS high vacuum pump system is comprised of
several pressurized components i.e. compressor, flex lines, and cryopumps.
Each component is charged with helium before shipment. After all
cryopumps, helium lines, and manifolds are attached to the compressor, the
system static helium charge pressure must be verified before system
operation. Once the static helium system pressure has been verified, the
system is ready for operation. After cooldown, the normal system
operating pressure is recorded.
NOTE: The 9600 Compressor is designed for continuous operation and
should remain ON even when the cryopumps are in a regeneration cycle.
Static Helium System Pressure Verification
The proper system static helium charge pressure is necessary so that the
cryopumps operate at maximum performance as well as to assure that the
compressor will operate below the maximum design motor winding
temperature which will maximize the life of the compressor motor.
1. Make sure the Compressor and Cryopump(s) are OFF.
2. Make sure all system components are connected together as
described in Section 3 - Installation.
3. Allow all system components to acclimate to a temperature
between 60º F and 80º F (15.5º C - 26.6º C).
4. Read the compressor helium pressure gauge located on the com-
pressor rear panel as shown in Figure 1-4. Compare the gauge
reading to the appropriate 50/60 Hz line frequency value (depend-
ing upon your system installation) indicated in Table 4-1.
Table 4-1: 9600 Compressor Helium Static Charge
Line Frequency Helium Static Charge Pressure
60 Hz 240 - 250 psig (16.5 - 17.2 bars )
50 Hz 255 - 265 psig ( 17.6 -18.3 bars )