BECKHOFF AX5805 Installation - Manual (Page 11)

Product description
AX5805 9
WARNING
Providing additional external safety measures for STO
When it is activated, STO initiates a coast-to-stop action. No braking is applied to the
connected motors; the torque applied to the motor is switched off and the motor coasts to
a stop. The time and distance it takes for the motor to stop depends on the mechanics and
kinetic energy present in the system. If there are loads suspended from the motor, the
motor may even be accelerated. The user must provide external safety mechanisms (e.g.
mechanical brakes) to prevent such inadvertent motion.
WARNING
Providing additional external safety measures for STO and SS1
When it is activated, STO initiates a coast-to-stop action. No braking is applied to the
connected motors; the torque applied to the motor is switched off and the motor coasts to
a stop. The time and distance it takes for the motor to stop depends on the mechanics and
kinetic energy present in the system. If there are loads suspended from the motor, the
motor may even be accelerated. The user must provide external safety mechanisms (e.g.
mechanical brakes) to prevent such inadvertent motion.
When the TwinSAFE drive option card determines that an error has occurred, the
preconfigured error reaction is activated. The standard error reaction is STO, but for
certain functions (SSR, SAR, SLI, SLP, SLS, SMA, and SMS), the SS1 error reaction can
also be parameterized.
When the SS1 error reaction is executed, the AX5805 TwinSAFE Drive option card
triggers an emergency stop ramp in the AX5000. This is purely functional and is not a
safety function. The STO safety function (Safe Torque Off) is activated after the motor
reaches SS1 or the time set by the ESTOP Ramp Time parameter has elapsed. Any
motors that are still moving after the ESTOP Ramp Time has elapsed will coast to a stop.
If there are loads suspended from the motor, the motor may even be accelerated. In order
to avoid inadvertent movements, external safety mechanisms (e.g. mechanical brakes)
must be provided by the user.
WARNING
Avoiding power interruptions
Power interruptions activate STO (Safe Torque Off), removing all torque from the motor.
Any motors that are moving coast to a stop. If there are loads suspended from the motor,
the motor may even be accelerated. The user must provide external safety mechanisms
(e.g. mechanical brakes) to prevent such inadvertent motion.
WARNING
Faults and interruptions in the EtherCAT communication
Faults and interruptions in the EtherCAT communication activate STO (Safe Torque Off),
removing all torque from the motor. Any motors that are moving coast to a stop. If there
are loads suspended from the motor, the motor may even be accelerated. The user must
provide external safety mechanisms (e.g. mechanical brakes) to prevent such inadvertent
motion.