Allen-Bradley 1394-SR9A 300W Shunt Module for 1394 Digital AC Multi-Axis Motion Control System

Brand Allen-Bradley

Model Allen-Bradley 1394-SR9A 300W

Product Overview

The 1394-SR9A is a high-capacity external shunt module manufactured by Allen-Bradley, a brand of Rockwell Automation, as part of the renowned 1394 Digital AC Multi-Axis Motion Control System. Specifically engineered for 22 kW system configurations, the 1394-SR9A plays a critical role in managing regenerative energy generated during servo motor deceleration. By safely dissipating excess energy, this module prevents dangerous DC bus overvoltage conditions that could otherwise trip the drive or damage sensitive system components.

Designed as a panel-mounted, fanless unit, the 1394-SR9A delivers 300 watts of continuous power dissipation and an impressive 160,000-watt peak capacity, making it exceptionally capable of handling high-energy braking events in demanding industrial motion applications. With a 4-ohm resistance rating and compatibility with both 200V and 400V AC drive systems, the 1394-SR9A integrates seamlessly into existing 1394 rack assemblies.

Built to Allen-Bradley’s exacting quality standards, the 1394-SR9A carries UL Listing (File #E59272), CUL certification, and CE marking, ensuring compliance with international safety and performance directives. Its robust construction and straightforward integration make it an indispensable component for maintaining system stability in multi-axis servo control environments.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1394-SR9A
Manufacturer	Allen-Bradley / Rockwell Automation
Product Type	External Shunt Module
Series	1394 Digital AC Multi-Axis Motion Control System
Continuous Power Rating	300 W
Peak Power Rating	160,000 W
Shunt Resistance	4 Ohms
Drive Voltage	200 / 400 VAC
Peak Current	200 A
Cooling Method	Fanless (Natural Convection)
Shipping Weight	3.63 kg (8 lb)
Enclosure Rating	IP20 (Panel-Mounted)
Agency Certifications	UL Listed (File #E59272), CUL Listed, CE Marked
Series Letter	B
Compatible System Module	1394-SJT22-X
Fuse (UL Marked)	Bussmann 600V DC 50A (FWP50A14F) or equivalent
Fuse (Non-UL)	Bussmann 600V DC 40A (170N2013) or equivalent
Operating Temperature	0 °C to 50 °C (32 °F to 122 °F)
Humidity Range	5% to 95%, non-condensing

Main Features and Advantages

The 1394-SR9A offers a compelling combination of high-energy capacity, reliable performance, and straightforward integration for industrial servo motion systems. Its design addresses one of the most critical challenges in multi-axis motion control: the safe and efficient management of regenerative braking energy.

High-capacity energy dissipation:

With a continuous rating of 300 W and a peak capacity of 160,000 W, the 1394-SR9A is engineered to absorb substantial regenerative energy pulses during rapid servo deceleration. This protects the DC bus from overvoltage trips, reducing nuisance faults and improving overall system uptime.

Fanless, low-maintenance operation:

Unlike higher-capacity shunt modules that require active cooling, the 1394-SR9A operates without a fan, relying on natural convection for heat dissipation. This fanless design eliminates a common wear item, reducing maintenance requirements and improving long-term reliability in dusty or contaminated industrial environments.

Seamless system integration:

The 1394-SR9A is purpose-built for use with the 1394-SJT22-X system module and integrates directly into the 1394 rack assembly. Its standardized form factor and terminal connections ensure a straightforward installation process for qualified automation technicians.

Robust safety and compliance:

Carrying UL Listing, CUL certification, and CE marking, the 1394-SR9A meets stringent international safety and electromagnetic compatibility requirements. The built-in fuse provides an additional layer of overcurrent protection, safeguarding both the shunt module and the broader motion control system.