CTI-Cryigenics 8500 User guide

CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
8500™ COMPRESSOR
(FOR USE WITH CRYO-TORR® HIGH-VACUUM
PUMPING SYSTEMS)
Installation, Operation
and Servicing Instructions
M8040251
Rev. B/1 (10/91)
Reprinted October 1991
Copyright© 1991, Helix Technology Corporation.
Printed in U.S.A.
-----------------------------
266 SECOND AVENUE POST OFFICE BOX 9171 WALTHAM, MA 02254-9171 [phone]

Manual Contents
This manual provides installation, operation and
servicing instructions by major system component
(cryopump and compressor) to simplify getting the
world's finest high-vacuum pump into operation quickly
and efficiently, meeting its designed capabilities,
Technical Inquiries
CTI-CRYOGENICS has a world wide system of
customersupportcenters available
to answer technical
questions, or to assist you with installation, operation
and maintenance of your high-vacuum equipment All
customer supportcenters have "rapid response" capa-
bilities providing 24-hour technical support. In the
Continental U.S.A. and Canada you may call toll free for
assistance 24 HOURS A DAY, 7DAYS A WEEK.
U.S. AND CANADA
DIAL TOLL FREE: 1-800-FOR-GUTS
367-4887
~
CTI-CRYOGENICS
266 Second Avenue
Waltham, Massachusetts 02254-9171, U.S.A.
Telephone [phone]
Telecopier/Fax [phone]
Western
CTI-CRYOGENICS
3350 Montgomery Drive
Santa Clara, California 95054, U.S.A.
Telephone [phone]
Telecopier/Fax ( 408) 988-6630
EUROPE
Germany
CTI-CRYOGENICS, GmbH
Haasstrasse 15
D-6100 Darmstadt
Germany
Tel: [phone]
Fax: [phone]
ii
Eralli:ll
CTI-CRYOGENICS, SA
4, rue Rene Raze!
Saclay
F -91892 ORSAY CEDEX
France
Tel: [phone]
Fax: [phone]
England
CTl-CRYOGENICS,Ltd.
Unit 4, Avenue Two
Station Lane Industrial Estate
Wilney, Oxford OX8 6YD
England
Tel: [phone]
Fax: [phone]
FAR EAST
lap.an
Daido Sanso K.K.
6-40 2-cho, Chikko Shinmachi
Sakai City
Osaka Pref.
592JAPAN
Tel: [phone]
Fax: [phone]
Kllmi
Zeus Company, Ltd.
4th Floor, Zeus Bldg.,
512-8, Dogok-Dong, Sucho-ku
Seoul, Korea
Mailing Address: Youngdong P.O. Box 992
Seoul, Korea
Tel: [phone]
Fax: [phone]
Your high-vacuum equipment is designed and
manufactured to ensure a minimum of maintenance.
However, should your unit require service or if you need
technical assistance, contact the nearest customer
support center. Have the following information
available when placing the call so we may assist you
quickly.
• Equipment Type • Product Application
o Product Serial No. o Hours of Operation
e Product Part No. o Specific Problem Area

iii/iv
CTI-CRYOGENICS
-----------~- - - - -- ---- ---·-
HELIX TECHNOLOGY CORPORATION
Contents
Section
1. Introduction
2. Inspection
3. lnstallatlon
4. Maintenance Procedures
Appendices
A. Troubleshooting Procedures
B. Electrical Schematicfor
8500 Compressor
C. Components In the Electrical
Control Module
of 8500
Compressor
D. 8500 Compressor
Flow Diagram
E. MultlpleCryopump Installation
F. Remote Cryo-Torr High-Vacuum
Pump Operation Using
8500 Compressor

)
Illustrations
1.1 8500™ Compressor . . . . • . . • . . • . • • . 1-4
3.1 Block diagram for 8500
Compressor installation. . • • . • . . . . . . • 3-1
3.2 Removing compressor pump
shipping supports . , , , , , , , , , , , , , , , 3-2
3.3 Stripping compressor input-power
cable insulation . , , , , , .. , , , , , , , , , 3-2
3.4 Input power cable
receptacle plug • • . . . • . • . . . • • • . • • 3-3
3.5 Wiring diagram for compressor-
receptacle plug. . • . • . . • . . . . . • • . • . 3-3
3.6 Preparing the 8500
Compressor control module ••..•.•..•. 3-5
3.7 8500 Compressor
installation ....•.•• , • . • • . . • . • • . 3-7
4.1 Disconnecting the adsorber
self-sealing couplings •• , , . . • . , , . . . . 4-1
4.2 Connecting self-sealing couplings • , , , . . • 4-2
B.l Electrical schematic for 8500
Compressor, P/N 8031351. ••.•.••.•.. B-3
C. l Components in the electrical control
module of 8500 Compressor. , .••••..•. C-3
D. l Flow diagram of 8500
Compressor . . . • . . . . • . . . . . • . • . . D-1
E. l Typical multiple cryopump installation
with 8500 Compressor • . . . • . . . . . . • • E-1
F. l Remote high-vacuum pump
switching schematic. . . . . . . . • . • . • . . F-2
v/vi
CTI-CRYOGENICS
HEifX--fEcHNOLciGY" ·c-OR"PORATJON
Tables
1.1 8500™ Compressor Specifications. , , , , , , 1-2
A. l Compressor Troubleshooting
Procedures •.....•.•.••.•..•... A-2

)
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
Section 1:
Introduction
1.1 · General. . . . . . . . . . . . • • • • • • • • • • • • • • .
1-1
1.2 Installation, Operation and
Servicing Instructions. . . . . . . . . . . . . . . . . . . 1-1
1.1 General
The manual provides instructions for installing, oper-
ating and servicing the 8500™ Compressor. If you are
installing or operating a Cryo-Torr® High-Vacuum
System you should also have available the high-vacuum
manual that applies to your particular system:
M8040240: Cryo-Torr 100, 7, 8 and SF High· Vacuum
Pumps
M8040252: Cryo-Torr IO High-Vacuum Pump
1.2 Installation, Operation and
Servicing Instructions
Installation, Operation and Servicing Instructions for
your 8500 Compressor provide easily accessible inform-
ation. All personnel with installation, operation, and
servicing responsibilities should become familiar with
the contents of these instructions to ensure high quality,
safe, reliable performance.
) M8040259: Cryo· Torr 400 High· Vacuum Pump
M8040266: Cryo-Torr 500 High-Vacuum Pump
The manuals for a system cover two basic components:
the high-vacuum pump and the compressor. Each
manual outlines the details necessary for installation,
operation and servicing of that component. A manual is
shipped with each system component (high-vacuum
pump and compressor).
When you purchase a system, you will receive the two
manuals necessary for system installation, plus a loose-
leaf binder with index tab separators, allowing you to
compile a complete indexed notebook.
1-1

CTI-CRYOGENICS
-- -- ------ - - - _,, ____ - -- -- ------- ---- -----
~~!:l_~_!~<:!j_NQ_~9~'.!:'_ CQ~£Q_Rp_T_~/\i
Table 1.1 8500™ Compressor Specifications
Dimensions
COMPRESSOR
DIMENSION
LOCATION INCHES(MM)
A 19.52max.
(496mm)
B 21.50max.
(546mm)
A I• B
·I
r
CB
CB
c
c 24.24max.
(616mm)
D 2.30 l
0
(55mm)
FRONT VIEW
r
SIDE VIEW
Weight
340lbs (154 kg) approximate
Weight (shipping)
445 lbs (202 kg) approximate
Powerrequirements (steady-state conditions)
MAXIMUM
FULL
PHASE
LOAD OPERATING
RUN
CURRENT VOLTAGE RANGE CURRENT
COMPRESSOR VOLTS HZ PHASE (AMPS) (VOLTS) (AMPS)
8500, PartNo. 208/230
60 3 22 198-250 26
80313480001 200 50 3 22 190-230 26
8500, Part No. 460 60 3
10
395-506
13
80313480002 380 50 3 12 342-457 16
1-2

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)
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
Table 1.1 8500™ Compressor Specifications (Cont.)
Power consumption
5kw, nominal operating power, 5.75 kW maximum
Nominal power factor 0.8: 7 .6 kVA max.
Compressor input-power cable (customer supplied)
Recommended type S0-4 conductor, 600V, neoprene jacket and 10-gauge wire
Install per Figure B.1, electrical schematic diagram, ensuring compliance with all national, state and local standards.
Helium pressure
Static: 195 - 205 psig (1345 - 1415 kPa) at 70 to 80"F (21to21'C)
Return: normal operation: 75-85 psig (517-590 kPa) at operating temperature
Ambient operating temperature range
50 to IOO"F (10 to 38°C)
Interface
Cold-Head power receptacles (3): Mates with plugs on cold-head power cables.
Compressor input-power receptacle: Mates with Hubbel twist lock plug No. 2723 (for Model GOO!).
For Model 8500 Model G002, Part No. 2433.
Gas-supply connector: 1/2-inch self-sealing coupling
Gas-return connector: 1/2-inch self-sealing coupling
Remote control receptacle (24 VAC): mates with PS connector P/N MS3106A-14, supplied by CTI-CRYOGENICS.
Adsorber service schedule
Replace every three years.
Cooling water requirements
70"F water supply, 2.5 gpm, 14 psid (pressure drop: water inlet to water outlet).
The pressure value does not consider discharge back-pressure conditions.
Maximum/minimum water requirements
Maximum outlet temperature 90"F (32°C)
Minimum inlet temperature 40"F ( 4°C)
Nominal inlet pressure, maximum 100 psig
This compressor has been designed to operate with water having a pH value of 6.0 to 8.0 and a calcium carbonate
concentration of less than 75 parts per million (typical municipal drinking water quality). For applications of lower
pH or greater hardness, water conditioning may be necessary.
1-3

Legend
I. Power ONindicator lamp.
2. Oil sightglass.
3. Cooling wateroutput.
4. Cooling water input.
5. Helium gas-return connector self-sealing coupling,
6. Helium gas-supply connector self-sealing coupling.
7. Compressor overload reset.
8. Voltage selector switch (S2).
9. Voltage selector switch (S3).
10. Elapsed-time meter (ETM).
11. Cold-headpowercircuitbreakers (CB2 andCB3).
12, Cold-head powercablereceptacles (J2, J3 andJ4).
13. Input power cable receptacle (Jl).
14. Helium gas chargefitting and valve.
15. Helium return pressuregauge.
16. Safetyinterlock.
17. System powerON/OFF switch circuit breaker (CB 1).
18. System remote control receptacle (JS). (Jumper
plug installed)
1-4
FRONT PANEL
REAR
PANEL
CTl-CRY(XjENICS
-----------
HELIX TECHNOLOGY CORPORATION
-- ------------- -- -- - ---
Figure 1.1 8500™ Compressor

)
0·1-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
Section 2:
Inspection
2.1 Packaging of the System.
2.2 The Compressor . . . . . .
2.1 Packaging of the System
The Cryo-Torr High-Vacuum Pump System is packaged
in three separate cartons. Listed below are the contents
of each carton, depending upon which cryopump is
included in the system. Note that an Installation,
Operation and Servicing Manual is included in the
carton for the high-vacuum pump and for the
compressor; each manual covers the component
packaged in that carton.
• •
• • • • • • • •
•
2-1
2·1
When installing a Cryo-Torr High-Vacuum Pump
System, CTI recommends that as you unpack a
component, you perform an inspection and the necessary
tasks for system installation for the component according
to the manual included with the component. Final
system installation and operation will be performed
following procedures in the high-vacuum pump manual
that applies to your particular system.
CRYO-TORR lllGH-VACUUM PUMP SYSTEM
CARTON MANUAL
LABEL SYSTEM COMPONENT
INCLUDED
Cryo-Torr®
Cryo-Torr 100, 7, 8 and SF Cryopump
M8040240
Cryo-Torr® Cryo-Torr 10 Cryopump M80402S2
Cryo-Torr® Cryo-Torr 400 Cryopump M8040259
Cryo-Torr® Cryo-Torr 500 Cryopump M8040266
Compressor 8500™Compressor M8040251
Accessories
Installation and Scheduled Maintenance Tool None
Kit and Accessories, PIN 80320400009 for
0001 compressor or P/N 803204000!0 for
G002 compressor.
2.2 The Compressor
On receipt, remove the 8500 Compressor from its
shipping carton and inspect the compressor for evidence
of damage as described in this Section.
1. Unpackage and remove the compressor from its
shipping carton.
2. Check the carton contents. It should contain:
a. 8500 Compressor.
2-1/2-2
b. Two barbed fittings for compressor cooling
water connections.
c. Compressor remote start connector.
d. Input power connector.
e. Oil prime manifold, PIN 8018129.
f. 8500 Compressor Manual, P/N M8040251.

)
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CTl-CRYOCiENICS
HELIX TECHNOLOGY CORPORATION
Section 3:
Installation
3.1 CompressorInstallation . . • . . . . . • • • • • • . • • 3-2
3.2 Connecting the Compressor to the Cryopump. • • . 3-6
3.3 Electrical Connection of Compressor. . • • . . • • . • 3-6
3.4 Multipump Installation ......•...•...••.. 3-7
PREPARING
THE
COMPRESSOR
INSTALLING
THE
COMPRESSOR
CRYOPUMP
CONNECTION
TO
COMPRESSOR
SECTJQN
• REMOVING COMPRESSOR PUMP 3.1
SHIPPING SUPPORTS
e SETTING VOLTAGE TAP SWITCH(ES)
• COOLING WATER:
- CONNECTIONS TO COMPRESSOR
- PH FACTORS AND CONSERVATION
- FLOW AND PRESSURE REQUIREMENTS
- TEMPERATURERJSE
• OIL CIRCUIT STABILIZATION
• MAKING HELIUM GAS RETURN AND 3.2/3.3
SUPPLY CONNECTIONS
e VERIFYING HELIUM STATIC PRESSURE
• MAKING ELECTRICAL CONNECTIONS
Figure 3.1 Blockdiagram for8500 Compressor installation
3-1

3.1 Compressor Installation
Installation of your compressor requires no special tools
other than those supplied in the Installation and
Scheduled Maintenance Tool Kit.
Preparing the Compressor
I. After removing the compressor front panel, refer to
Figure 3.2 and remove the front two compressor
pump shipping supports.
a. Remove the front two nuts and red flat washers
that secure the compressor pump tightly in
position.
Note: Retain the two red flat washers for use
during shipment.
b. Remove the two rubber grommets that are in the
package attached to the compressor: install
them, flat side up, onto the front two mounting
posts.
c. Reinstall the two nuts and screw them down
flush with the tops of the mounting posts.
d. Replace the compressor front panel.
HEX-HEAD
NUT
Figure 3.2 Removing compressor
pump shipping supports
3-2
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
------ - - ------ --- - --- --- -
Assembling the Compressor
Input-Power Cable
ACAUTION
Use round cable (diameter 0.595" to 1.50") with
the CTI-supplied compressor receptacle plug. Do not
tin the conductor leads.
Assemble the compressor input-power cable using the
CTI-supplied compressor receptacle plug and a 600-volt
power cable that has aS0-4 conductor, 600-volt rating
neoprene jacket and IO-gauge wire as follows.
I. Prepare the input power cable by stripping wires
and jacketof the cable as shown in Figure 3.3.
INSULATING
JACKET\
L CONDUCTOR
LEADS
Figure 3.3 Stripping compressor
input-power cable insulation
2. Disassemble the receptacle plug. See Figure 3.4.
a. Loosen the two assembly screws (1) securing the
receptacle plug face (2) to the cover (3) until
plug face can be removed from cover.
b. Open cord clamp (5) by loosening the two
clamp screws (4) securing the clamp to the cover.
Note: If you are using cable with a diameter
greater than 0.895 inch, remove the
auxiliary insert (6) from the cover.
c. Insert the stripped end of the power cable into
the cover opening by starting from clamp end
(6) until the stripped conductor ends are exposed.
d. Loosen and back off all terminal screws on
receptacle plug face (2).

)
"X" TERMINAL
7
1. Assembly Screw (2)
2. PlugFace
3. Cover
4. Clamp Screw (2)
KEYWAY
GROUND
TERMINAL
{GREEN SCREW!
5. Cord Clamp
6
6. Auxiliary Insert
7. Key
8. Tenninal Screw (4)
CTI-CRYOGENICS
-_,,,,,,_ - - - -- --- ___ ,,__ - - -------
HELIX TECHNOLOGY CORPORATION
Figure 3.4 Input power cable receptacle plug
e. Insert all conductors into their proper wire entrance
holes on receptacle plug face. See Figure 3.5.
Check that there are no bare conductors exposed.
Tighten tenninal screws to 9-12 in.-lbs torque,
PHASE A x
PHASE B y
PHASE C z
GROUNO
G
~
COMPRESSOR- RECEPTACLE
PLUG {CTI SUPPLIED)
Figure 3.5 Wiring diagram for
compressor-receptacle plug
3-3
3. Assemble the receptacle plug by sliding the cover
over the wire assembly noting key (7). Align the key
on the cover to the keyway on the plug face and
tighten the two assembly screws (1) to secure the
cover and plug face. Alternately tighten the clamp
screws (4) to 8-10 in.-lbs torque.
AWARNING
Insure that the ground wire is returned to asuitable
ground in a non-interrupting manner.
Do not connect the compressor to the powersource at
this time. All of the preparation must be completed and
all the panels reinstalledbefore electtically connecting
the compressor.

Electrical preparation of compressor
control module
1. Refer to Table 1.1,page 1-2,forelectricalpower
requirements. Then, using a voltmeter, measure
the phase-to-phase voltage from the power source.
2. Prepare the compressor voltage selector switch(s)
S2 and S3 as required in accordance with Figure
3.6.
Cooling Water: Preparation
If flexible water hose connections are used, install the
barbed fittings supplied with the compressor on the input
and output connections:
1. Apply a lightcoating ofstandard plumbing thread
sealant on the barbed fitting threads.
2. Tighten fittings on 1/2-inch FPT input and output
connections. DO NOT OVERTIGHTEN.
3. Connect flexible hoses to the fittings and secure
with hose clamps.
If hard piping is desired, apply alight coating of
plumbing thread sealant on threads and install the water
lines directly onto the compressor 1/2-inch FPT input
and output connections. DO NOT OVERTIGHTEN.
A CAUTION
Check water connections for leaks.
3-4
CTl-CRYCXJENICS
HELIX TECHNOLOGY CORPORATION
-- -·----- --- -- ------------- - --- --------
Cooling Water: General Considerations
For Your Information ••
Adjust your water flow to maintain an optimum
discharge water temperature of 80°F with a minimum
input pressure of7 psi. For detailed cooling water
requirements, see Table 1.1, page 1-3.
Cooling water having a pH value of6.0 to 8.0 and
acalcium-carbonate concentration of less than 75
ppm, the quality of typical municipal drinking water,
is acceptable. If the cooling water has a pH value
lower than 6.0 ora calcium-carbonate concentration
higher than 75 ppm, water conditioning may be
required.
1. The cooling water must meet the following flow,
pressure, and temperature requirements.
• Maximum outlet temperature 90°F (32°C).
• Minimum inlet temperature 40°F (4°C).
• Maximum inlet pressure 100 psig.
A system with nominal cooling water conditions
would have a 70°F water supply, 2.5 gpm, 14 psid
(pressure
drop: water inlet or water outlet). The
pressure value does not consider discharge back-
pressure conditions.
2. To conserve water adjust the water flow to maintain
80°F discharge temperature. Shutoff cooling water
when the compressor is not running.
A CAUTION
If cooling water below 40°F (4°C) is allowed torun
through the compressor while the compressor is not
operating, the compressor oil will change viscosity
and thicken, causing the compressor to overheat and
shut off at startup. In this event, repeatedly restart the
compressor and allow it to run until is has shut off
several times. The oil temperature will rise and
thereby allow continuous compressor operation.

VOLTAGE
SELECTOR
SWITCH (S2)
VOLTAGE
I []jJ 2
VOLTAGE
SELECTOR 3 4
SWITCH lS3l-~-----tDiil
SYSTEM REMOTE
CONTROL
RECEPTACLE
(J5)
COMPRESSOR
CONFIGURATION
P/N 80313480001
208/230 VAC, 50/60 Hz
P/N 80313480002
31!0 V AC, 50 Hz
460 V AC, 60 Hz
*Factory Setting
e
REMOTE
FREQUENCY
(Hz)
50
60
50
60
ELAPSED-TIME
METER (ETM)
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
COLO-HEAD POWER
CIRCUIT BREAKERS (CB2 ANO CB3l
:
=:-_;co~LO~H~EA~D ~--rsYSTEM POWER
ON/OFF SWITCH
8
0
1
COLDHEAD CIRCUIT BREAKER
(CB ll
SYSTEM POWER
LINE
VOLTAGE
190-210
210-230
198-230
230-250
342-400
400-457
395-460
460-506
/J?.;~'\--::--'T---t-COLO-HEAO
3
SETTINGS
S2 S3
2 3
2• 4•
2 3
2•
4*
2 3
2* 4*
2 3
2*
4*
POWER CABLE
RECEPTACLES
(J2, J3 AND J4l
COLD-HEAD
VOLTAGE
137-153
131-144
145-169
144-158
126-147
125-143
145-169
144-158
Figure 3.6 Preparing the 8500 Compressor control module
3-5

3. Drain and purge water from the compressor before
shipping it back to the factory or subjecting it to
freezing conditions. Purge water from the com-
pressor by blowing compressed air, regulated to
30 to 40 psig (200 to 275 kPa) into the compressor
output connection and allowing water to exit from
the water input connection.
Oil Circuit Stablllzatlon
I. Check to insure that the cover and all panels are
properly installed on the compressor.
2. With the system power ON/OFF switch in the OFF
position, connect the input-power cable to the power
source. If necessary, refer to Table 1.1, page 1-2,
for electrical requirements.
3. Place the system power switch to the ON position
and allow the compressor to run 15 minutes to
stabilize the oil circuit. If the compressor shuts
down, oil system priming may be necessary. Refer
to Section 4.2.5, page 4-5, for priming procedures.
3.2 Connecting the Compressor
to the Cryopump
For Your Information··
If your application requires the use of multiple com-
pressors on a single gas manifold, you must install
an external check valve on each compressor. Order
CTI Kit No. 8080275K004 and contact the Product
Service Department for installation guidance on
manifolding compressors.
Make the connections between the cryopump and
compressor. See Figure 3.7.
1. Remove all dust plugs and caps from the supply
fittings and return lines, compressor, and cryopump
cold head. Check all fittings.
2. Connect the helium-gas return line from the gas-return
connector on the rear of the compressor to the gas-
return connector on the cryopump cold head.
3. Connect the helium-gas supply line from the gas-supply
connector on the rear of the compressor to the gas-
supply connector on the cryopump cold head.
4. Attach the supply and return line identification
decals (CTI supplied) to their respective connecting
piping ends.
3-6
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
Verify proper helium supply static pressure by con-
firming that the helium pressure gauge reads 195 - 205
psig (1345 - 1415 kPa), in an ambient temperature range
of 50 to lOO°F (10 to 38°C).
If the indicated pressure is higher than 205 psig (1415
kPa), reduce the pressure as follows:
I. Remove the flare cap from the gas charge fitting
located on the rear of the compressor.
2. Open the gas charge valve very slowly. Allow a
slight
amount of helium gas to escape until the
helium pressure gauge reads 200 psig (1380 kPa).
3. Close the gas charge valve and reinslall the flare
cap.
If the indicated pressure is lower than 195 psig (1345
kPa), add helium gas as described in Section 4.2.1,
page4-3.
3.3 Electrical Connection of
Compressor
AWARNING
The system power switch on the rear of the com-
pressor must be in the OFF position before making
any and all electrical connections.
1. Connect the power cable to the rear panel of the
compressor and the other end to the electrical power
connector on the cryopump.
2. Plug the compressor input power cable into the
power source.
3. Turn the system power switch on the rear of the
compressor to the ON position.
4. If the compressor does not start the most likely
cause is that the main power input phasing is
incorrect. To correct the phasing, interchange any
two of the three phase wires at the compressor input
power receptacle plug. See Figure 3.5, page 3-3.

)
3.4 Multipump Installation
Your 8500 Compressor can be connected to more than
one high-vacuum pump at a time. For example, three
Cryo-Torr 8 vacuum pumps can be connected to a single
8500 Compressor. For detailed instructions on multiple
cryopump installation, refer to Appendix E.
ELECTRICAL :f1_..t
POWER ~
SOURCE
INPUT POWER CABLE
(CUSTOMER SUPPLIED)
CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
If a remote switching system is desired, refer to
Appendix F for fabrication ofa remote switching circuiL
Remove the supplied jumper plug connected to the
compressor remote connector J5 and connect the
switching circuit to J5 connector. If the remote
switching circuit is to be discontinued, then simply
disconnect the remote switching circuit from the J5
connector and reinstall the jumper plug.
Note: The compressor will not operate if the jumper
plug is not reinstalled.
ROUGHING
VALVE
USER'S
VACUUM
CHAMBER
PURGE
VALVE
1 "'-""'_,l
l_Jfv'!Ji:.J:'U
Hl-VAC
VALVE
CRYOPUMP
HELIUM- GAS
SUPPLY UNE
... (TO COLO HEAD) -===,;?'
8500
COMPRESSOR
ELECTRICAL
POWER FROM
COMPRESSOR
Figure 3.7 8500 Compressor installation
3-7(3-8