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Thermcraft XST-6-0-36-3V User Manual

Page 39

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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

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