item Controller BL 1-04 /C
― Product manual
22
INFO
Acknowledgement of error messages
When error messages are acknowledged, all of the acknowledgeable errors concerning the functional safety technology will
also be acknowledged at the same time. See section 4.11 Diagnostics and fault clearance on page 27.
The servo drive monitors the status of the control inputs STOA and STOB.
This enables the firmware of the servo drive to detect the request of the STO safety function ("Safe Torque Off") and various
non-safety-oriented functions will be performed:
▪ Detection of the disconnection of the driver supply for the power semiconductors by the integrated STO circuit
▪ Deactivation of the drive control and also of the actuation of the power semiconductors (PWM)
▪ Deactivation of the holding brake actuation (if configured)
▪ Finite status machine of the servo drive including an assessment of the actuation (discrepancy time monitoring)
▪ Detection of application-related error states
▪ Hardware diagnosis
▪ Status and error indication via displays, digital outputs, fieldbuses, etc.
WARNING
Brake output not safety-oriented
The brake is actuated via the non-safety-oriented firmware of the servo drive. If the application requires the safe actuation of
the brake, additional external measures must be implemented.
NOTICE
Motor coasts down in an unbraked manner
If one of the control inputs STOA or STOB is deactivated while the power output stage is active, the drive will coast down in an
unbraked manner if the holding brake is not connected. As a result, the machine will be damaged.
Connect the holding brake to the servo drive.
NOTICE
Undersized holding brake
Check whether your motors with a holding brake are suitable for braking and stopping the motor in the event of an error by
way of the holding brake.
It is possible to request the safe state while the actuation of the power semiconductors (PWM) is active. However, an acknowl
-
edgeable error message will be issued. The status of the voltages will be checked and assessed every 10 ms. If they are
unequal over a longer period of time, an error message will be issued. See section 4.11 Diagnostics and fault clearance on
page 27.
4.6 Circuit examples
The following sections provide circuit examples with detailed drawings and notes. The wiring is identical for all servo drives of
the BL 1-04 /C series. The examples show the connection of a BL 1-04 /C.
