Rockwell-automation 6189x Integrated Display Industrial Computers User User Manual download pdf (Page 35)

Rockwell Automation Publication 6181P-UM003A-EN-P - May 2014 35

Installation Chapter 2

Connect DC Power

Computers with catalog numbers ending in DC have a DC input terminal block

for connecting to a 18…32V DC power source.

The functional ground screw is required to be grounded on DC power models

for EMC regulatory compliance. DC power models support operation from

either a SELV or PELV power source. The DC common (DC-) can be connected

together to the functional ground screw to support some SELV cases where

grounding at the computer is required by the end user.

The power supply is internally protected against reverse polarity.

Follow these steps to connect the computer to a DC power source.

1. Turn off the main power switch or breaker.

2. Verify that the DC power wires meet these requirements:

• Material: Stranded copper

• Wire gauge: 0.326…3.31 mm

(22…12 AWG)

3. Insert each DC power wire into the correct terminal-block on the DC

power adapter (A).

4. Secure the DC power wires to the DC power adapter’s terminal-block

screws (B).

5. Connect the DC power adapter to the power supply terminal block (C).

Secure the DC power adapter into place with the terminal-block screws (D).

Torque the terminal screws to 0.687 N•m (6.1 lb•in).

7. Connect the computer to earth ground by using a 1.5 mm

(16 AWG) or

larger external wire.

Use a ground wire with green insulation and a yellow stripe for easy

identification.

8. Apply 18…32V DC power to the computer.

ATTENTION: Use a Class 2/SELV isolated and ungrounded power supply as

input power to the computer. This power source provides protection so that

under normal and single fault conditions, the voltage between the conductors

and Functional Earth/Protective Earth does not exceed a safe value.

IMPORTANT

A functional ground screw connection is required for EMC compliance.

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Rockwell-automation 6189x Integrated Display Industrial Computers User User Manual Page 35