West Control Solutions Pro-EC44 - Manual (Page 30)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 23
Plug-in Module Slot 2 - Triac Output Module
If fitted with a Triac output module, connect as shown. This output is rated at 0.01 to 1 amp
@ 280V AC 50/60Hz. Isolated from all other inputs and outputs. A snubber should be fitted
across inductive loads to ensure reliable switch off of the Triac.
Figure 30. Plug-in Module Slot 2 - Triac Module
Plug-in Module Slot 2 - Transmitter Power Supply Module
If fitted with a transmitter power supply module (TxPSU), connect as shown. The output is a
24V nominal (unregulated, 19 to 28V DC), supply at 22mA max. Only one TxPSU is
supported, do not fit in slot 2 if one is already fitted in slot 3.
Figure 31. Plug-in Module Slot 2 - Transmitter Power Supply Module
Plug-in Slot 3 Connections
A selection of plug-in modules are available for Module Slot 3. They are interchangeable with
slot 2, but not slot 1.They can be fitted during manufacture, or purchased and fitted later by
the user. Modules in slot 3 are designated Output 3, and for dual modules Output 3A and 3B.
Their functions are set in the Output Configuration sub-menu. Connect as illustrated below.
Plug-in Module Slot 3 – Single Relay Output Module
If fitted with a single relay output module, connect as shown. The relay contacts are SPDT
and rated at 2 amps resistive, 240 VAC. If it is used to switch mains voltages, the supply
should be separate from the instrument supply and should be correctly switched and fused.
Figure 32. Plug-in Module Slot 3 – Single Relay Module