Thermcraft XST-3-0-36-3V - Manual (Page 37)

Installation and Operation Handbook Installation
2408 and 2404 Controller 1-7
Sensor input connections
The connections for the various types of sensor input are shown below.
Fig 1-7 Sensor input connections
PLUG-IN MODULE CONNECTIONS
Module 1, 2 and 3
Module positions 1, 2 and 3 are plug-in modules. They can be either two terminal modules of
the types shown in Figure 1-7, or four terminal modules of the types shown in Table 1-1.
The tables show the connections to each module and the functions that they can perform.
Module 1 is normally used for heating and module 2 for cooling although the actual functions
will depend upon how the controller has been configured.
PDS modes
Table 1-8 refers to PDS modes 1 and 2.
PDS stands for ‘Pulse Density Signalling’ Input/Output. This is a proprietary technique for
bi-directional transmission of analogue and digital data over a simple 2-wire connection.
PDS 1 mode uses a logic output module to control aTE10S solid state relay and provides a
load failure alarm.
PDS 2 mode uses a logic output module to control a TE10S solid state relay, provide
load/SSR failure alarms, and read back the load current for display on the controller.
VI
V+
V-
VI
V+
V-
VI
V+
V-
VI
V+
V-
Thermocouple
Resistance
thermometer
mA input Volts or mV inputs
+
-
PV
2.49 Ω
current
sense
resistor