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Lenze 9400 servo drives now have an optional plug-in SM301 safety module that can accept a single resolver input and has functions including Safe Stop 2, Safe Operating Stop and Safe Speed Monitor.

The Lenze SM301 is able to achieve PL d/SIL 2 safety levels resulting in cost savings for machine builders.

Generally the most critical safety components in a machine design are the drives, where dangerous movement could be initiated.

Recent years have seen big advances to integrate safety functions into the drive which can simplify and reduce the cost of machine builds.

Direct handling of sensor signals in the drive has reduced component count and simplified the process of compliance with the safety standards.

However the full cost benefits have been held back by a requirement to use special encoders for feedback, typical Sincos types that are both expensive and delicate.

Now Lenze has certified the SM301 safety module to operate with a single resolver feedback.

As resolvers are simple, robust and a standard option for Lenze synchronous and asynchronous servo motors, this new development leads to a sharp reduction in costs.

In addition, feedback from a single standard incremental encoder is possible.

Both options comply with standards PL d of EN ISO 13849-1 and SIL 2 of IEC61508.

A higher safety level of PL e and SIL 3 can be achieved by adding a second incremental encoder.

The cost savings from resolver feedback apply to seven motion functions : Safe Stop 2, Safe Operating Stop, Safely Limited Speed, Safe Maximum Speed, Safe Speed Monitor, Safe Direction and a new function, Safely Limited Increment.

The SM301 plug-in module is readily available for the Lenze 9400 servo drives and also allows use of the Profisafe safety bus.

With 40 years' experience, Lenze Ltd are specialists in drive and automation equipment for the UK market. Today Lenze employ 60 people and operate with management systems approved to ISO 9001:2008.

Experience and expertise

The engineering comes first. With almost 50 per cent of our staff being qualified engineers, the right-sized technical solution to your problem is our goal. Our vision of right sizing means to work with you in order to achieve the optimum solution in terms of cost and performance.

The complete drive system  

Our products fit together to make the complete drive and automation system. Lenze products include automation, controllers, servos, inverters and geared motors. Our Techdrives division adds essential drive components such as couplings, actuators and locking bushes to complete your design.  

Worldwide, we are there to help you

Lenze companies are in 29 countries and have sales offices in a further 24. Full product information is available on our website and the international helpline makes it easy to contact us.

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