ctrlX SAFETY "SafeMotion"
Safety functions in special mode "Safe standstill"
WARNING
Injury and/or property damage caused by deviation from
standstill position!
⇒ When using the safety function "Safe operating stop",
error situations (e.g. mains failure, controller defect) can
occur in which the drive controller can no longer keep
the axis in position. In this case, the axis must be kept in
position by additional measures (e.g. mechanical brake).
In the time between the occurrence of the error and the
triggering of the "additional holding device", axis motion
can occur. This has to be taken into account for the risk
assessment of the installation.
For such axes, Bosch Rexroth recommends using the
safe braking and holding system.
Make sure that the value parameterized in “P-0-3255,
SMO: Velocity threshold for Safe standstill" is sufficiently small, because
during transition to the safe state, the standstill monitor (“P-0-3285.0.2,
Monitoring window for Safe operating stop") becomes active immediately after
the velocity has fallen below this value, and the drive then must have come to
standstill.
8.3.3
Safe brake control (SBC)
The safety function "Safe brake control (SBC)" safely (via two channels)
switches off an inductive load (e.g., self-applying holding brake). This allows
motions to be inhibited in a safety-relevant way.
WARNING
The safety function "Safe brake control" only checks the
control of the inductive load, but not the holding or
brake function! Uncontrolled axis motion due to insuffi-
cient holding or brake function! The risk analysis has to
show whether the holding or brake function has to be
cyclically checked. If this is the case, the machine manu-
facturer has to develop functions to check the holding or
brake function.
To simplify the terminology, "brakes" is always used in the following para-
graphs. Other inductive loads can be used, too. Restrictions will be pointed
out.
The safety function is intended for safety-relevant applications up to
Category 4, PL e according to EN ISO 13849-1 or up to SIL 3 according to
IEC EN 62061.
The safety function works independently of a measuring system.
Required optional safety technology module
The safety function can be used in ctrlX DRIVE drive systems equipped with the
optional safety technology module “Mx”.
Configuration
To use the safety function "Safe brake control", it has to be configured using
(P‑0‑3265.0.1), when safety technology is commissioned.
Furthermore, it can be configured for each brake individually whether it
is allowed to manually release the brake during the active safety function
"Safe brake control“ (P‑0‑3265.0.1).
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