Rockwell Automation 1753-L32BBBP-8A GuardPLC 1800 Controller - Manual (Page 6)

6 GuardPLC 1800 Controllers
Rockwell Automation Publication 1753-IN002C-EN-P - June 2010
Wire the Controller
The following section describe how to connect the voltage supply and wire the controller’s
digital inputs and outputs.
Connect the Voltage Supply
The 24V DC voltage supply must feature galvanic isolation (in accordance with
EN 60950 or UL 1950) since inputs and outputs are not electrically isolated from the processor.
To comply with CE Low Voltage Directives (LVD) and UL restrictions, you must use either a
Safety Extra Low Voltage (SELV), or a Protected Extra Low Voltage (PELV) power supply to
power this controller. A SELV supply cannot exceed 30V rms, 42.4V peak, or 60V DC under
normal conditions and under single-fault conditions. A PELV supply has the same rating and is
connected to protected earth.
The supply voltage is connected via a 4-pin connector that accommodates wire sizes up to
2.5 mm
2
(14 AWG). You need to connect only one wire to L+ and one wire to L-. Both L+ and
L- terminals are internally connected, so you can daisy-chain 24V DC power from the
GuardPLC controller to other devices in the panel by using the remaining terminal.
IMPORTANT Protect the controller with a slow-blowing fuse.
IMPORTANT The GuardPLC 1800 controller can draw up to 9 A. The controller needs 1 A to
operate. Up to 8 A can be used to source voltage power for inputs and
outputs connected to the controller.
ATTENTION: Do not reverse the L+ and L- terminals or damage to the
controller will result. There is no reverse polarity protection.