Sunpower Inc. CryoTel
MT Operating Instructions version 4
15
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 to cold tip of cold finger.
a.
Apply a thin layer of Apiezon thermal grease or Indium to the copper tip of the cold
finger in order to maximize conductivity.
2.
Attach the customer-provided cryostat by appropriate means if a vacuum is required for the
application.
3.
If using a vacuum, make wire connections from temperature sensor and any other
measuring devices inside the cryostat through Dewar feedthroughs.
a.
For maximum performance, wires should not touch the walls of the Dewar. Contact
with walls will increase the heat loading (conduction) during use and will yield
lower available cooling power.
4.
Seal the cryostat vacuum except for the connection to the vacuum pump (if using vacuum).
5.
Mechanically attach the cryocooler assembly to the customer provided mounting device.
6.
Connect the wiring from the cryostat feedthroughs to the appropriate test and measurement
devices.
a.
The cold tip temperature sensor must be connected to the controller s mating
connector as described previously using the provided wiring harness and connector
(See Figure 13 for controller connections).
7.
Attach the vacuum pump to cryostat, start the vacuum and allow it to reach a vacuum of
10
-4
Torr or better.
B. Beginning Operation
1.
Prepare the CryoTel MT for testing as described above.
2.
Connect the power cables for the CryoTel MT to the controller s mating connector
(controller connections in Fig. 13).
a.
Verify the correct polarity is observed with respect to the CryoTel MT
orange
power cable wires are positive, white wires are negative.
b.
Attach the included wire harness to the cooler as shown in Figure 6 then attach the
plastic connector at the other end to the connector with orange and white wires on
the controller (Fig 13).
i.
Note: The connector attached to the cooler wires is an AMP Mate-N-Lok®
plug housing, 1-480698-0; with AMP Mate-N-Lok® contacts, 3505471-1(
available from Mouser Electronics, part numbers 571-14806980 and 571-
3505471 respectively).
ii.
Note: The connector attached to the controller wires is an AMP Mate-N-
Lok® cap housing, 1-480699-0 with AMP Mate-N-Lok® contacts, 350550-
1 ( available from Mouser Electronics, part numbers 571-14806990 and 571-
3505501 respectively).
3.
Connect the controller to a 24V
DC
power outlet.
a.
Note: The input power connector attached to the control board is an AMP Mate-N-
Lok® cap housing, 1-480699-0 with AMP Mate-N-Lok® contacts, 350547-1 (
