38 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 2 Install the CompactLogix 5370 L1 Controller
Power is connected to the controller via a removable connector that is
connected to the front of the controller. The following graphic shows the
connector.
Consider these points before completing the steps in this section:
• This section describes how to connect an external 24V DC power
source to the CompactLogix 5370 L1 controller.
For information on how to provide field power to input and output
devices that are connected to the embedded I/O modules of the
controller and local expansion modules via the removable connector, see
page 144
.
• Use a power source that most effectively meets your application needs.
That is, calculate the power requirements for your application before
choosing a power source to avoid using a power source that far exceeds
your application requirements.
• This section assumes that any DIN rail you use has been grounded
following Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
.
• The embedded power supply of the CompactLogix 5370 L1 controller
provides power to the controller and POINTBus backplane.
WARNING: Do not connect directly to line voltage. Line voltage must be
supplied by a suitable, approved isolating transformer or power supply
having short circuit capacity not exceeding 100VA maximum or equivalent.
The controller power requirement is 30VA.
IMPORTANT The controller is grounded once it is installed on a DIN rail as described in
Mount the System on page 32
.
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