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Bosch Rexroth AG
Integrated safety functions
Notes on commissioning
Notes on project planning
6.2.2
Safe Brake Control (SBC)
Brief description
Features
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01
Rexroth IndraDrive Integrated Safety Technology "Safe Torque Off" (as of MPx-16)
For examples of interconnection, please refer to
When configuring the safety function "Safe Torque Off", it is absolutely
necessary to observe the following safety instructions:
DANGER
⇒ If external force influences are to be expected with the safety function
"Safe Torque Off", e.g. in case of a vertical axis, this motion has to be safely
prevented by additional measures, e.g. a mechanical brake or a weight
compensation; for such axes, Bosch Rexroth recommends that you use the
safe braking and holding system.
WARNING
⇒ Even if the control of the power section has been safely locked, momentary
axis motion, depending on the number of poles of the motor, can be
triggered, when two errors are occurring simultaneously in the power section
with the voltage DC bus being active:
●
Breakdown of a power semiconductor and
●
Breakdown of another semiconductor
In this case, two of six semiconductors are affected in such a way that the
motor shaft is aligning.
Synchronous motor example: For a 6-pole synchronous motor, the motion
can be a maximum of 30 degrees. For a directly driven ball screw, e.g.
20 mm per revolution, this corresponds to a one-time maximum linear motion
of 1.67 mm.
When an asynchronous motor is used, the short circuits in two separate
circuits of the power section have almost no effect, because the exciter field
breaks down when the inverter is shut down and has completely died down
after approx. 1 s.
Using the "Safe Brake Control (SBC)" function requires the
optional safety technology module "L4".
The safety function "Safe Brake Control (SBC)" switches off the motor
holding brake safely (via two channels).
Before selecting the safety function "Safe Brake Control (SBC)",
the drive system must be decelerated via the command value
input; drive-controlled deceleration does not take place!
The safety function "Safe Brake Control" (SBC) has the following features:
●
The safety function "Safe Brake Control" (SBC) is automatically
activated when the safety function "Safe Torque Off" (STO) is selected.
DOK-INDRV*-SI3-**VRS**-AP06-EN-P
"Examples of
Lethal injury and/or property damage caused
by unintended axis motion!
Injury and/or property damage caused by
deviation from standstill position!
application"
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