Datasheet

3.3 Connections
3.3.5. CTL cable
The TCU controls the temperature of the LLH with a Peltier junction and monitors
the temperature with a PT100 through the CTL cable. The Peltier connector shown
in figure 3.9 carries 6 pins, described in table 3.4. Pin 1 is circled, and a half-moon
engraving runs from pin 1 to pin 6. A fixed current is supplied to pin 3 and 6. The
resistance of the PT100 varies as a function of temperature and the temperature
measurement is given by the voltage between pin 4 and 5.
4
5
6
1
2
3
1
2
1
7
3
4
5
6
Figure 3.9.: Peltier junction and PT100 cable connectors on LLH (left) and TCU (right).
1 1 +power supply for Peltier element
2 2 -power supply for Peltier element
3 3 +I PT100
4 4 +signal PT100
5 5 -signal PT100
6 6 -I PT100
7 GND
pin nb name purpose
ground
Table 3.4.: CTL cable connector pinout.
c
2012 SA 35