Power Supplies

FlexLogix Power Supplies

In a FlexLogix system, select an Allen-Bradley power supply. In applications that must be compliant with CSA requirements, use a Separated Extra-Low Voltage (SELV) power supply that is compliant with IEC 61010.1, Annex H.

When selecting power supplies, follow these guidelines.

• Provide power for the controller separately from the power for the FLEX I/O modules. To provide power for FLEX I/O modules, follow the guidelines in the documentation for those modules.
  
• When providing power for the 1794-FLA extended-local I/O adapter, treat the adapter as a communication adapter, not as an I/O module.
  

FLEX Power Supply

The following power supplies are the Allen-Bradley offerings for the FlexLogix system.

Cat. No.	Input Voltage	Power Supply Input Power	Apparent Input Power, Max.	Transformer Load, Max.	Output Current, Max.
1794-PS3	120V/220V AC	86 W	205 VA	250 VA	3.0 A¬
1794-PS13		36 W	53 VA	90 VA	1.3 A
Certifications: UL, CSA (Class I, Division 2, Group A, B, C, D), CE.

Standard Power Load and Transformer Sizing

These graphs display backplane power load.

• Use the real power value in watts for determining the amount of heat dissipation you will have inside the enclosure.
  
• Use the apparent power value in VA for estimating power distribution sizing.
  
• Use the transformer load value in VA of each power supply plus all other loads on a transformer to determine the required transformer size.