Installation and Operation Handbook Installation
1.2.2
Fixed connections
The power supply and sensor inputs are always wired to the same fixed positions whatever plug-in modules are
installed.
These are as shown in Figure 1-4.
The diagrams below show the connections for the various types of input.
The input will have been configured in accordance with the ordering code.
Figure 1-5: Sensor input connections
1.2.3
Plug-in module connections
In Figure 1-4, Modules 1, 2 and 3, and Comms
are plug-in modules.
Module positions 1, 2 and 3 each have two terminals. They will accept four types of module: Relay, Logic (non-
isolated), Triac, and DC (non-isolated) output.
Collectively, these can be configured to operate in six different ways:
Heating control
Cooling control
Alarm output
Program event output
PDS mode 1*, which provides logic heating using a Eurotherm TE10S solid state relay with feedback of a load
failure alarm.
PDSIO mode 2*, which provides logic heating using a Eurotherm TE10S solid state relay, with feedback of the
load current reading and two alarms: solid state relay failure and heater circuit failure.
*
PDS stands for ‘Pulse Density Signalling Input/Output’. This is a proprietary technique developed by Eurotherm
for bi-directional transmission of analogue and digital data over a simple 2-wire connection.
Power supply connections
Sensor input connections
X
Warning:
Do not connect more than one sensor to any one input
Modules 1, 2 and 3
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
HA025041 issue 12 Aug 14
1-5
Summary of Contents for XST-2-0-12-1V1-E28
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