Festo EMCA-EC-67 Serie Traducción Del Manual Original página 31

EMCA-EC-67-...
Caution
Severe injuries as a result of uncontrolled movement of the passive actuators when
switching off the power output stage. The STO function is insufficient as the sole safety
function for drives that are subject to permanent torque (e.g. through suspended
loads).
• Shut down the passive actuators mechanically, if required, e.g. via a brake. This
especially applies to vertical axes without automatic locking arrangement, clamping
units or counterbalancing.
• Reliably prevent movement of the actuators by suspended loads or other external
forces, e.g. with a mechanical holding brake.
Note
Control of motors with an integrated holding brake (only EMCA-EC-...-...-B).
The holding brake is activated by the non-safety-relevant firmware of the device. When
the output stage is switched off, there is no deceleration of the drive via a braking ramp.
The holding brake is closed immediately.
• Check whether the integrated holding brake can stop the actuators.
• Note the mechanical inertia of the holding brake.
• Take into consideration the higher wear of the holding brake in comparison to auto­
matic brake control in normal operation.
Note
Failure of the output stage.
If the output stage of the device fails when an STO function is active, it may result in
the drive jerking through a limited detent movement of the rotor. The maximum rotation
angle/travel corresponds to the pole pitch of the motor used.
Festo – EMCA-EC-67-... – 1603 English 31