Sunpower Inc. CryoTel
MT Operating Instructions version 4
21
4.
Display target temperature in Kelvin
d.
Command: SET TTARGET<CR>
e.
This command shows the target temperature of the controller when in mode 2
5.
Set target temperature in Kelvin when in mode 2
a.
Command: SET TTARGET=V<CR>
b.
V corresponds to the target temperature. This value is stored in flash so it is retained in the controller at
power up.
6.
Display command stroke when in mode 0 control.
a.
Command: SET PWOUT<CR>
7.
Set command power when in mode 0 control
a.
Command: SET PWOUT=V<CR>
b.
V corresponds to the target power in watts. While any number from 0.0 to 999.99 can be input, the
controller will only command a power that will not damage the cryocooler.
c.
The minimum power is 30W @ 77 K.
d.
The maximum power is a function of cold head temperature and increases as the cold temperature
decreases.
8.
Display current command power and power limits
a.
Command: E<CR>
b.
The top value is the maximum allowable power for the current temperature. The middle value is the
minimum allowable power. The bottom is the current command power. All values displayed with this
command are in watts.
9.
Remote ON-OFF feature:
There is a control feature that is available that allows the power output to the cryocooler to be diabled while
keeping the controller powered up. The controllers are shipped with this function disabled. The majority of
our customers does not need it and would not want to make the wiring changes to connect the pins. Pins 3
and 5 on the RJ45 serial communications port are used as the signal input. Shorting these pins together
enables the controller output; open circuit disables the controller output.
SET PID=0
000.00
SET PID=2
002.00
SET TTARGET
077.00
SET TTARGET=86.42
086.42
SET PWOUT
150.00
SET PWOUT=80
80.00
E
090.00
030.00
080.00
