Servo Amplifiers And Drives Expanded By Safety-relevant Functions

2023 Author: Hannah Pearcy | [email protected]. Last modified: 2023-11-26 11:39

The new servo drives and integrated drives of the Lexium 62 and Lexium 62 ILM product ranges from Schneider Electric include integrated functions for SS1, STO, SS2, SOS, SDS, SDI, SLS and SMS. For example, users of motion control technology at Pacdrive 3 should now be able to implement differentiated concepts of safety-related automation up to Cat. 4 / PL e according to EN ISO 13849-1 and SIL 3 according to IEC 61508. Compared to the standard drives, they have an expanded range of safety-relevant functions: STO (Safe Torque Off), SS1 (Safe Stop 1), SS2 (Safe Stop 2), SOS (Safe Operating Stop), SLS (Safe Limited Speed), SDI positive / negative (Safe Direction, both directions of rotation) and SMS (Safe Maximum Speed).

The same range of functions is also available through an option module for the integrated servo drives of the Lexium 62 ILM series. By relocating the control electronics of a servo amplifier into the field, concepts of cabinet-free automation should be possible. The option module is flanged to the standard electronics of the drives and fits all versions of the current Lexium 62 ILM series. All functions are certified for the immediate implementation of solutions for machine safety up to Cat. 4 / PL e according to EN ISO 13849-1 and SIL 3 according to IEC 61508.

Servo amplifier for safety-related automation

The safe integrated drives communicate via Sercos like their standard counterparts. Safety-related communication takes place parallel to standard communication on the Sercos Automation Bus. The following applies to both series - Lexium 62 and Lexium 62 ILM: Safe and non-safe units can be mixed as required. Servo drives from the Lexium 62 series can be inserted at any position together with the common power supply. Likewise, Lexium 62 ILM integrated drives with option module in the line, tree and daisy chain topologies possible with ILM can take any position between standard units. Mixed groups of drives in the control cabinet version and integrated drives should continue to be possible when safe variants are included.

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According to Schneider Electric, the new servo amplifiers and the option module offer several advantages. The wiring effort is to be reduced, and machine downtimes should also be reduced through maintenance measures or material changes. Extremely advantageous for the provision of spare parts: All safety functions can be implemented with the standard motors of the Lexium SH3, Lexium SHS and Lexium MH3 series equipped with sin / cos encoders - without specially certified encoders or similar modifications. The same applies to the integrated servo drives of the Lexium 62 ILM series. Here, too, only the safety option module that can be attached to the motor electronics with two screws makes the difference to the standard drives.

On the engineering side, PLC-open safety-compliant function blocks support the integration of the safe drives. These are integrated into the safety-related, IEC-61131-compliant program of the Modicon safety controls available for Pacdrive / Sercos communication. Sosafe is still the tool for creating the program and parameterizing the configuration. (sh)