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11 Mar 2016

Press retrofit with safe servo drive technology PMC

With the safe motion solution, Sona BLW Präzisionsschmiede has reduced its investment costs and achieved an enormous increase in productivity.

Sona BLW Präzisionsschmiede GmbH from Remscheid produces workpieces in the so-called precision forging process on automated presses at rapid speed. This includes gear wheels for gear boxes, for example, that are used in the automotive industry. With the press retrofit, the company now achieves a higher productivity with increased safety.
 

More productivity and process stability thanks to safe motion functions

During the setup and maintenance of machines their movements can often only be carried out slowly and with restrictions so that the operators are not placed in jeopardy. The EN 61800-5-2 defines necessary functions in this regard for safe motion sequences, meaning safe motion. The setup can thus be performed easily thanks to the functions 'Safely limited speed' and 'Safe Direction', for example. The 'Safely Limited Increment' function protects the operator when material is being fed in against uncontrollable feed movements. Maintenance work can be performed quickly and without risk thanks to the 'Safe brake test' function. Functions such as 'Safely Reduced Speed' were retrofitted through the combination of the motors present in the press with the servo amplifiers PMCprotego DS.
 

Retrofit without exchange of motors

An exchange of the motors and gear boxes was not necessary for this, whereby the investment costs were kept very low. The 'Safe Stop 2' function with monitoring of the braking ramp now allows a rapid stop upon opening a safety gate without the drives shutting down. Because the intermediate circuit voltage of the servo amplifiers no longer has to be switched off after the conversion, the service life could be increased and a very rapid restart with minimal rejects could be achieved.
 

Further information:

Servo drive technology and safe motion functions