Automation | 4 MINUTE READ

4 Key Criteria for Industrial Drive Specification

With automation shaping the landscape for industrial drive selection, it is vital for machine tool manufacturers to understand defining specification criteria.


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It can be challenging for machinery manufacturers to continually update their industrial drive specification choices in line with the rapidly evolving landscape of Industry 4.0. But in doing so, these companies can offer their customers a wealth of financial benefits as well as better use of factory space, optimized machinery performance and improved safety standards.

The key to selecting an industrial drive that is compatible with automation is understanding how the drive has been designed and constructed to operate in conjunction with other machines and control systems. In doing so, specifiers can better establish whether the drive will not only deliver tangible results, but also whether the investment will stand the test of time against the ongoing evolution of connectivity in the industrial sector.

Adaptable Production Space with Cabinet-Free Drive Technology

Since intelligent servodrives have become an indispensable part of modern machines, end users have enjoyed efficient format changeovers and motion profile adaptations at the push of a button. This performance-enhancing technology comes at a cost though, and with more servodrives comes larger, space-hungry control cabinets.

These “unproductive” cabinets essentially fill production space that would be better used for expanding a production facility through modularization. Historically, the motor and control unit have been separated from each other with a power and encoder cable running from each motor into the control cabinet. This has long been the only way to use servo technology, until 2014 saw the introduction of cabinet-free drive technology which retains all the advantages of servodrives but delivers as much as 90% lower cabling costs and a significant gain in space by eliminating control cabinets entirely.

Designed in accordance with IP65, all network access components previously located in the control cabinet are installed directly into the machine. The mains module is a single unit and connects the entire system to the mains, containing the mains filter, the mains choke and the mains contactor. The regenerative supply module with control electronics, braking resistor and braking transistor completely replaces the supply and control electronics in the control cabinet, enabling the traditional cabinet structure to be completely removed from the system design.

Compared to traditional automation, cabinet-free solutions use a fraction of the hybrid cabling with the same motor spacing. This not only cuts material costs and installation times, it also reduces the probability of faults in the cabling and delivers additional monetary savings through the direct connection of sensors, I/O modules and field bus components to the decentralized drives.

Integral Safety Features for Faster Engineering

Drive-integrated safety functions offer an economical method of ensuring maximum protection for people and machines while increasing productivity ergonomics and efficiency in engineering.

It is no secret that uncontrolled movements pose significant hazards and the more time operators must spend inside a machine, the longer manufacturers are spending ensuring compliance with relevant regional safety standards.

Intelligent, drive-integrated safety functions make it easier and more efficient to perform maintenance work in accordance with legal requirements, offering a wealth of competitive advantages when it comes to reducing system downtime and labor costs.

Building on the in-demand integrated safety functions such as “safe stop 1,” “safe limited speed” and “safe direction of rotation,” leading innovators of drive-integrated safety features are already bringing to market a wider range of logic functions designed to deliver maximum machine safety, even satisfying the highest safety levels in some instances.

Some of these more sophisticated functions include safe door locking, safe braking and holding systems capable of monitoring and controlling two independent brakes via redundant channels in the drive, ensuring safety in the event that operators need to spend time beneath gravity-loaded axes.

Operational Flexibility with Open Core Engineering

Open core engineering puts entirely new application possibilities within reach for the very first time, replacing traditional human-machine interface (HMI) devices with smart alternatives during the commissioning, operation and diagnostic phases.

The ultimate in operational convenience, open core engineering unlocks the cutting edge of machine performance by expanding access to the control core and inviting the use of mobile and digital technologies into the industrial environment.

Applications made possible with open core engineering include commissioning machinery with scannable QR codes and the visualization of processes within the machine, plus diagnostic tools which allow obtained data to be transmitted immediately for storage and evaluation. With new and extensive applications available using commonly used high level languages across all standard operating systems, developing bespoke solutions for a range of complex machining requirements is more possible than ever before, making open core engineering a key specification criteria for drives moving forward.

Eliminating Higher-Level Controllers by Combining Motion and PLC Functionality

Some drive solutions, such as Rexroth’s IndraMotion MLD units, combine motion and common programmable logic controller (PLC) functionality to create a modern, open automation platform for modular machine concepts.

By decentralizing the control architecture in a compact motion control system with both motion and logic control handled directly in the drive, it is possible to completely eliminate the need for higher-level controllers. As well as offering financial benefits due to less hardware and cabling, this type of drive architecture also enables easier engineering, faster startup, faster diagnostics and the added benefit of only having to back up one data source.

Scalable for a variety of process and manufacturing facilities, with ready-to-use function libraries to simplify use, this style of drive-based solution is available as a single axis control for basic applications as well as a multi-axis control for applications with a maximum of ten axes.

Modules based on PLCopen also provide access to standardized motion control functions while open technology and communication interfaces simplify the integration of MLD units with a variety of automation concepts.