Integrated safety functions in the AX5000

Integrated safety functions in the AX5000

Machine movements create a range of hazards for machine operators and maintenance personnel. Anyone coming into contact with the machine therefore has to be protected from injuries at all times and during all operating phases, from commissioning to decommissioning. Integrated control and safety technology is a prerequisite for safe and economic automation. With the integration of safety technology into drive technology, Beckhoff consistently developed the TwinSAFE system philosophy further. TwinSAFE enables integrated automation, ranging from digital inputs and logic systems to drives or digital outputs. Simple handling, diagnostic and support functions help the user to implement the required application quickly and safely.

Integrated safety functions in the AX5000

The “Safety of machinery” standard, EN ISO 13849‑1:2006, which replaces the existing EN 954‑1, places even greater responsibility on the machine manufacturer.

The safety of a machine is either assessed by Performance Level (PL a‑e) EN ISO 13849‑1:2006 or Safety Integrity Level (SIL 1‑4) IEC 62061. To this end, the safety-related functions for drives are defined in IEC 61800‑5‑2.

Drive-integrated safety significantly simplifies the realisation of the required safety functions. Safety sensors (e.g. light curtains, emergency stop buttons, OK buttons) are collected via the fieldbus where they are installed. The required function is triggered in the TwinSAFE Logic Bus Terminal or the TwinSAFE Logic EtherCAT Terminal, and the Servo Drive carries it out.

Two TwinSAFE option cards are available for the AX5000: AX5801-0000 and AX5805-0000 (for functional descriptions see next page).

 

Option card AX5801-0000

Control takes place via a digital output of a TwinSAFE Terminal to AX5801-0000. For all functions the mains voltage remains connected at the Servo Drive.

AX5801-0000 SS1: Safe Stop 1

Safe
shutdown

EN 60204-1:
Stop 1

  • The motor is shut down in a controlled manner.
  • The motor can no longer generate a dangerous rotary field.
  • Suspended loads must be secured with further measures.

AX5801-0000STO: Safe
Torque Off

Safe
restart lock

EN 60204-1:
Stop 0

  • The motor coasts down when activated.The axis should therefore be stopped before activation.
  • The motor can no longer generate a dangerous rotary field.
  • Suspended loads must be secured with further measures.

 

 

Option card AX5805-0000

Control is performed via EtherCAT; no further wiring is required. For all functions the mains voltage remains connected at the Servo Drive.

AX5805-0000 SS1: Safe Stop 1

Safe
shutdown

EN 60204-1:
Stop 1

  • The motor is shut down in a controlled manner.
  • The motor can no longer generate a dangerous rotary field.
  • Suspended loads must be secured with further measures.

AX5805-0000STO: Safe
Torque Off

Safe
restart lock

EN 60204-1:
Stop 0

  • The motor coasts down when activated. The axis should therefore be stopped before activation.
  • The motor can no longer generate a dangerous rotary field.
  • Suspended loads must be secured with further measures.

AX5805-0000SS2: Safe Stop 2

Safe
operating
stop

EN 60204-1:
Stop 2

  • The motor is shut down in a controlled manner.
  • Safe stopping with full torque

 
AX5805-0000 SOS: Safe
operating
stop

Safe
shutdown



  • Monitoring of the reached stop position within limits with full torque
  • Exceedance of the limits leads to STO.

AX5805-0000SLS: Safely
limited
speed






  • Monitoring for compliance with max. velocity
  • Exceedance of vmax leads to safe shutdown STO.

AX5805-0000SDI: Safe
direction







  • Monitoring of compliance with specifi ed direction of rotation
  • Movement in the blocked direction leads to safe shutdown STO.