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SunPower CryoTel Series Operating Instructions Manual

Free-piston stirling cryocoolers
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®
®
CryoTel
Family
Free-Piston Stirling Cryocoolers
OPERATING INSTRUCTIONS
®
Model: CryoTel
GT
Controller: Gen II v1.0.0
Manual Version: 6
Effective: May, 2012

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Summary of Contents for SunPower CryoTel Series

  • Page 1 ® ® CryoTel Family Free-Piston Stirling Cryocoolers OPERATING INSTRUCTIONS ® Model: CryoTel Controller: Gen II v1.0.0 Manual Version: 6 Effective: May, 2012...
  • Page 2 Intellectual Property Declaration Manufactured by Sunpower, Inc., under the following patents: U.S. Pats 4,583,364; 4,602,174; 4,623,808; 4,649,283; 4,805,408; 4,864,232; 4,866,378; 4,912,409; 4,926,123; 5,003,777; 5,148,066; 5,342,176; 5,385,021; 5,450,521; 5,457,956; 5,461,859; 5,496,153; 5,502,968; 5,525,845; 5,537,820; 5,592,073; 5,642,088; 5,642,622; 5,715,693; 5,749,226; 5,775,273; 5,873,246;...

  • Page 3: Table Of Contents

    Contents ® I. CryoTel GT Operating Instructions ....................4 II. Precautions (Dos and Don’ts) ......................5 III. Unpacking .............................6 IV. Mechanical Mounting ........................7 V. Attachment of Heat Load to Cold Finger ..................7 VI. Cold End Vacuum ..........................8 VII. Feedthroughs ..........................9 VIII. Temperature Sensor........................10 IX.

  • Page 4: Cryotel ® Gt Operating Instructions

    CryoTel GT Operating Instructions The Sunpower cryocooler is a precision instrument; robust in many ways but fragile in others. This operating manual provides standard-use instructions and precautions. Please post where technicians will be working with the unit. Please do not assume that if a warning or instruction is not included here, a particular test or application of this unit is acceptable.

  • Page 5: Precautions (Dos And Don'ts)

    Use an external, automatic, closed loop control system which attempts to control the cryocooler operation by varying the set point settings in the cryocooler controller. Check with Sunpower before making any modifications to the cryocooler Note that if the controller is installed in an enclosure, cooling must be provided.

  • Page 6: Unpacking

    Figure 2: CryoTel ® GT Cryocooler III. Unpacking When unpacking or handling, only hold the cryocooler by the pressure vessel or the transition (see ® Figure 2). The CryoTel GT may sit horizontally on a level bench top or table, but the cooler must be supported to prohibit rolling.

  • Page 7: Mechanical Mounting

    TIG. It is recommended that, if needed, the customer allow Sunpower to perform the welding operation. The mechanical structure including the cryostat attachment plate, heat rejection copper, and transition have been designed to allow mounting the entire assembly by the cryostat and cantilevering the cooler and vibration absorber from the cryostat in a given application.

  • Page 8: Cold End Vacuum

    Figure 5: Cold Tip ¼”-20 Threaded Hole VI. Cold End Vacuum ® The cold finger of the CryoTel GT operates best in an insulated vacuum. The vacuum eliminates possible loading of the cold finger from convection or condensation of elements in the atmosphere such as water vapor and nitrogen.

  • Page 9: Feedthroughs

    VII. Feedthroughs The electrical pins on the metal plate at the end of the pressure vessel near the balance absorber are surrounded by glass, which acts as an insulator and prevents helium from leaking out of the pressure vessel. This arrangement is called a feedthrough. Because of the glass insulator, the feedthroughs should be handled cautiously.

  • Page 10: Temperature Sensor

    The controller is designed to us a Lakeshore PT-111 platinum RTD or equivalent. Sunpower packages the PT-111 in a copper disk so that the sensors are identical in size, shape and wiring. Figure 8 shows the sensor and the connector to the controller.

  • Page 11: Figure 9: Test Cap Assembly

    Laboratory testing can be accomplished with a test cap arrangement similar to the one shown in Fig 9. The test cap is used to supply a specified heat load to the cold tip. The test cap consists of a copper cap with two resistors, a through hole with ¼”-20 clearance for connection to the copper tip, and a copper clamp ring with M3 clearance holes to clamp temperature sensors around the circumference of the cold tip.

  • Page 12: Heat Rejection

    Overheating the cryocooler will cause permanent damage. A. Water Jacket Sunpower can provide a permanent or removable water cooling jacket with the CryoTel® GT (Fig. 11 – both are identical in appearance). Use a suitable thermal grease to maximize conduction between the heat rejecter and the water jacket if using a removable unit (the permanent unit is installed at the factory and does not require thermal grease).

  • Page 13: Figure 11: Water Jacket Heat Rejection

    (Fig. 12-permanent fins are pictured), use a fan with a rating of 100 cubic feet per minute (1.6e- /min) for air through-flow. Sunpower recommends mounting the fan to a cylindrical shroud that can be placed around the fins in order to direct the air through the fins. Note that some heat rejection also occurs from the walls of the pressure vessel.

  • Page 14: Cryotel Operation

    X. CryoTel® Operation CRITICAL! – Do not operate the cryocooler without adequate cooling at the heat rejection site. Overheating the cryocooler will cause permanent damage. A. Preparation 1. Attach application apparatus or test cap assembly to cold tip of cold finger. a.

  • Page 15: Led And Digital Output 4

    Applying a heat load to the cold tip during the warming process reduces the time needed to reach room temperature. b. Sunpower recommends using a relay in conjunction with the temperature sensor to ensure that the power supply to the heat load shuts off when the cold tip temperature reaches 300 XI.

  • Page 16: Error Summary

    Digital Output 4 (I/O Connector pin 4) will go high (5V) when the cooler is at the set point temperature. When the cooler is not at the temperature set point Digital Output 4 will be low (0V). See Figure 15 for I/O connector pin out.
  • Page 17 Check the wiring between the controller and the cryocooler for any problems. If this does not resolve the error contact Sunpower. 2. Jumper Error a. Power cycle the controller. If this does not resolve the error contact Sunpower. 3. Serial Error a. Communication with the controller may not be possible after a serial error.

  • Page 18: Cryotel Serial Communications Command Reference

    XIII. CryoTel® Serial Communications Command Reference Control the CryoTel® GT with any terminal emulator program. A common choice is Hyperterminal, as it is included with Windows, (Windows 7 users may need to download Hyperterminal). The connecting cable for basic functionality is included. Caution: Use of an external program, such as LabVIEW™, to establish closed loop control of the cryocooler via serial communication, may cause controller malfunction.
  • Page 19 Some advanced function requires adding wires to the basic cable or creating a new cable. Part numbers for the required additional parts are located below: I/O connector Crimp Terminals Manufacturer: Molex Manufacturer PN: 90119-2109 Digi-key PN: WM2558-ND Note: The above terminal is for 22-24AWG and is tin/lead over nickel. Different terminals are available from the manufacturer.
  • Page 20 Basic Communication Functionality CryoTel GT Terminal Emulator Commands The following pages show an explanation of each of the terminal emulator commands and display examples. All of the parameters set will be retained in memory when the controller is power cycled unless otherwise noted.
  • Page 21 6) Set control Mode a) Command: SET PID=<VAL><CR> b) VAL may be a 2 or a 0. If it is 0, the controller will maintain a constant power as commanded by SET PWOUT. If it is 2, the controller will try to maintain a constant temperature as commanded by SET TTARGET.
  • Page 22 SET SSTOPM =1 001.00 d) When in Soft Stop Mode 1, setting Digital Input 1 high will shut down the cryocooler. Setting it low or leaving it disconnected will allow the cryocooler to run. The Onboard Isolated 5V (I/O connector pin 10 or pin 12) can be used to set Digital Input 1 high.
  • Page 23 17) Set user defined minimum power a) Command: SET MIN=<VAL><CR> b) Sets the user defined minimum power. c) VAL corresponds to user defined minimum power output in Watts. Entering a value that is below the safe operating power of the cooler will not result in damage to the cooler. SET MIN=120 120.00 18) Display user defined minimum and maximum powers...
  • Page 24 c) If in thermostat mode 1, a return of 1 indicates the thermostat is closed and is allowing the Cryocooler to run. A return of 0 indicates the thermostat is open and the Cryocooler is shut or is shutting down. TSTAT 001.00 23) Display proportional constant of the temperature control loop.
  • Page 25 SET PASS=ABC123 001.00 d) The controller must be unlocked to change the password. If the controller is locked and the password has been misplaced, it must be sent back to Sunpower to be unlocked. 30) Display lock state a) Command: LOCK<CR>...
  • Page 26 33) Display list of most controller parameters. a) Command: STATE<CR> b) Returns a list of most of the controller parameters and what they are set to. STATE MODE 002.00 TSTATM 000.00 TSTAT 000.00 SSTOPM 000.00 SSTOP 000.00 002.00 LOCK 000.00 300.00 000.00 PWOUT...

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