BONFIGLIOLI Agile Series Application Manual Functional Safety page 20

Further advantages:
− Contactors on motor side not required, reduced installation requirements, less
components, more space in electrical cabinet
− Simple realization with external safety control device for Stop-Category 0
− With a suitable external safety control a functional safety according to Stop Cate-
gory 1 can be achieved
− The drive can be connected to power supply continuously; communication and
parameter configuration of the frequency inverter are maintained while the torque
is disabled With a suitable external safety control device the function „Safe Stopp
1 (SS1 c)" according to EN 61800-5-2 can be realized together with the AGL.
Easier machine approval, because the safety function is certified via a type examina-
tion check.
Triggering of function "Safe Torque Off"
Safe Torque Off can be achieved by:
− Intentional triggering during operation in order to stop a drive and safely prevent
restarting, e.g. for maintenance work on a machine.
− Triggering by actuation of an emergency stop switch or monitoring of protective
systems, e.g. safety door.
− Detection of an error. The drive may only start again after the error has been
acknowledged and eliminated.
Detection of an error through self-diagnosis
Application example:
The danger zone near a transport conveyor is monitored by a light grid. If anybody
enters the danger zone, the light grid is interrupted. The DC 24 V supply for the digi-
tal inputs STO of the function „Safe Torque Off" is switched off and the frequency
inverter output stage is disabled. The drive coasts to a standstill. Disconnection from
mains supply is not necessary. Communication via field bus or addressing via the
terminals is still possible. An external brake which stops the motor can be addressed.
20
Actuation of safety relay
Safe Torque Off
AGL-STOV0-01SV0-05
06/12