Allen-Bradley 1794-PS13 Flex I/O Power Supply Module

Product Overview

The 1794-PS13 comes from Allen-Bradley as a dedicated power supply for Flex I/O systems. First, this module provides reliable DC power to Flex I/O modules and adapters. Specifically, it converts AC line voltage to a stable 24V DC output. Therefore, the 1794-PS13 is essential for any Flex I/O distributed architecture. You can use it alone or combine it with other power supplies. Consequently, this module ensures your I/O system receives clean, regulated power.

Input Voltage Specifications

The 1794-PS13 accepts a wide range of AC input voltages. Specifically, the input voltage range spans from 85V AC to 264V AC. Meanwhile, the input frequency range covers 47 Hz to 63 Hz. Thus, this power supply works in almost any country worldwide. The nominal input voltage sits at 120V AC, 50/60 Hz at 0.6 A max. Alternatively, it operates at 230V AC, 50/60 Hz at 0.42 A max. The maximum input current reaches 0.7 A under full load. As a result, the 1794-PS13 handles voltage fluctuations without issues.

Output Voltage and Current Ratings

The 1794-PS13 delivers a nominal output voltage of 24V DC. Specifically, the output voltage range spans from 20.4V DC to 27.6V DC. This range includes noise and 5% AC ripple. The output current rating sits at 1.3 A continuously. Moreover, the output power reaches 31.2 Watts maximum. The output ripple measures 1200 mV peak-to-peak. Therefore, the 1794-PS13 provides clean power for sensitive analog modules. The minimum load requirement is 0 mA, so you can run it with no connected devices.

Power Surge and Overcurrent Protection

The 1794-PS13 includes robust protection features for reliability. First, the output surge capability drives up to four adapters simultaneously. This surge handles the inrush current of multiple devices. Moreover, the overcurrent protection trips at 1.4 A. This feature shuts down the output when current exceeds safe limits. Additionally, the overvoltage protection activates at 35V DC. Thus, the 1794-PS13 protects your expensive I/O modules from damage. The isolation voltage between input and output reaches 2500V DC for 1 second.

Complete Technical Specifications Table

• Input Voltage Range: 85-264V AC

• Input Frequency Range: 47-63 Hz

• Nominal Input (120V): 120V AC, 50/60 Hz, 0.6 A max

• Nominal Input (230V): 230V AC, 50/60 Hz, 0.42 A max

• Maximum Input Current: 0.7 A

• Output Voltage Nominal: 24V DC

• Output Voltage Range: 20.4-27.6V DC

• Output Current: 1.3 A

• Output Power: 31.2 W

• Output Ripple: 1200 mV peak-to-peak

• Minimum Load: 0 mA

• Overcurrent Protection: 1.4 A

• Overvoltage Protection: 35V DC

• Isolation Voltage: 2500V DC

• Power Dissipation (max): 7 W

• Thermal Dissipation: 23.9 BTU/hr

Status Indicator Information

The 1794-PS13 includes a built-in green power indicator. This LED energizes when the output voltage exceeds 20.4V DC. It remains lit as long as output stays below 28V DC. The indicator stays OFF under three conditions. First, when no power applies to the supply. Second, when output voltage exceeds 35V DC. Third, when overcurrent protection shuts the unit down. Thus, you can diagnose the 1794-PS13 status at a glance.

System Integration Capabilities

The 1794-PS13 supports daisy chaining of the supply output. This feature allows one power supply to feed multiple adapters. Specifically, it powers up to four adapters with its surge capability. Moreover, you can use this module with both AC and DC I/O modules. Thus, the 1794-PS13 works in mixed-voltage Flex I/O systems. For example, you can power digital and analog modules from the same supply. Consequently, this reduces the number of power supplies in your cabinet.

Temperature Ranges

The 1794-PS13 operates reliably in standard industrial environments. First, the operating temperature range spans 0 to 55 °C (32 to 131 °F) . Meanwhile, the storage temperature range extends from -40 to 85 °C (-40 to 185 °F) . The relative humidity tolerance reaches 5 to 95% non-condensing. Therefore, the 1794-PS13 survives in humid conditions without failure.

Vibration and Shock Ratings

The 1794-PS13 withstands significant mechanical stress. Specifically, it handles operating vibration of 5 g at 10 to 100 Hz. The operating shock rating reaches 30 g peak acceleration. Moreover, the non-operating shock rating goes up to 50 g. Thus, this power supply suits mobile or high-vibration applications. For instance, you can install it on moving equipment or near heavy machinery.

Physical Dimensions and Weight

The 1794-PS13 has a compact footprint for panel mounting. Specifically, the dimensions measure 87 mm (H) x 69 mm (W) x 69 mm (D) . In imperial units, that is 3.4 x 2.7 x 2.7 inches. The module uses an open-type enclosure without external protection. For reference, it weighs approximately 0.32 kg. As a result, the 1794-PS13 fits easily into crowded control cabinets.

Wiring Requirements

The 1794-PS13 requires specific wire types for safe installation. First, use solid or stranded copper wire for connections. Recommended wire size ranges from 0.34 to 2.5 mm² (22 to 12 AWG) . The wire insulation must rate at 75 °C (167 °F) or higher. Maximum insulation thickness sits at 1.2 mm (3/64 in) . Tighten terminal screws to 0.8 Nm (7 lb-in) . The wiring category for this module is Category 2.

Installation Guidelines

Mount the 1794-PS13 on a standard DIN rail. First, snap the module firmly onto the rail. Then, connect the AC input wires to the proper terminals. Connect the DC output wires to the Flex I/O adapter or modules. The 1794-PS13 supports daisy chaining for multiple devices. Accordingly, always disconnect AC power before wiring the module. Finally, provide strain relief for all input and output wires.

Grounding Requirements

Proper grounding ensures reliable operation of the 1794-PS13. First, connect the ground terminal to a verified earth ground. Use a zinc-plated steel DIN rail for consistent grounding. The isolation between AC input and DC output terminals is mandatory. Specifically, the isolation voltage requirement is 2500V DC for 1 second. Consequently, this high isolation protects your control system from line transients.

Important installation notes include the following:

• Use a dedicated circuit breaker for the AC input.

• Do not exceed 264V AC on the input terminals.

• Keep AC and DC wiring in separate conduits.

• Verify the output polarity matches your Flex I/O adapter.

• Ensure adequate ventilation around the power supply.

Packaging List

• 1794-PS13 power supply module (1 unit)

• Removable terminal block (attached)

• Product identification label

• Installation instructions sheet

Frequently Asked Questions (FAQ)

1. How many adapters can the 1794-PS13 power?
The 1794-PS13 provides sufficient surge current to drive up to four adapters. For continuous operation, stay within the 1.3A output rating.

2. What is the output voltage range of this power supply?
The 1794-PS13 outputs between 20.4V and 27.6V DC. The nominal output is 24V DC at 1.3A.

3. Does the 1794-PS13 work with 230V AC input?
Yes, the 1794-PS13 accepts 85-264V AC input. It works perfectly with 120V or 230V AC power sources.

4. What does the green LED indicate on this module?
The green LED on the 1794-PS13 lights when output voltage exceeds 20.4V DC. The LED stays OFF during faults or power loss.

5. Can I use the 1794-PS13 with analog modules?
Yes, the 1794-PS13 provides clean 24V DC power with 1200 mV ripple. This ripple level works well with most analog modules.