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Internal protection for drive control

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article image The PowerFlex70 DriveGuard safety solution.

A NEW series of safety features for the Allen-Bradley PowerFlex 70 line of ac drives provides cost-effective, certified protection for drive control.

Known as DriveGuard, the new Rockwell Automation safety architecture consists of an internally mounted electronics card that equips the drive with a 'safe off' function, preventing it from delivering rotational energy to motors.

The 'safe off' offering complies with the European Standards for Safety of machinery, EN954 Category 3, and is in line with ongoing efforts at Rockwell Automation to meet more exacting functional safety requirements--or the 'zone concept'.

This concept modularises plant safety by allowing a portion of the production line to slow or stop for troubleshooting, while the rest of the line remains active.

As such, safe corrections or adjustments can be made to one section of a process without necessitating complete system shutdown and subsequent restart--essentially saving valuable production time.

Depending on the configuration, the 'safe off' function is triggered by the interruption of an emergency safety device and automatically causes the motor to coast to a stop.

According to Marjan Sprajc, product manager standard drives, Rockwell Automation Australia: "The internal nature of the Allen-Bradley DriveGuard solution may eliminate the need for wiring of external devices, such as safety contactors."

This means more streamlined configuration with reduced real-estate.

Easily inserted by removing the drive's front cover, the DriveGuard solution has been specifically designed for use on all Allen-Bradley PowerFlex 70 AC drives.

In addition, the PowerFlex 70 range has been expanded to include ratings of up to 37kW at 400 volts, which joins the existing models available in IP66 washdown and flange mount housings.

The DriveGuard solution and other Rockwell Automation safety products will be on display at 'The Safety Show 2004' (stand E10) October 13-15, Sydney Showground and Exhibition Complex.

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