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ctrlX SAFETY "SafeMotion"
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Safety functions in special mode "Safe standstill"
With the safety function "Safe brake control" configured, the brake controlled
by SBC is only controlled by the safety technology, i.e. the standard firmware
cannot directly control the brake anymore. This requires internal communica-
tion between the standard firmware and the safety technology. Therefore, a
delay can occur between the request for brake control by the standard firm-
ware and the execution by safety technology. This delay takes effect in addition
to the times defined in the parameters S-0-0206 (waiting time Drive On) and
S-0-0207 (waiting time Drive Off) (see also Functional Description of firmware
"Motor holding brake").
The brake is switched off if the maximum braking time of the drive (S-0-0273)
is exceeded. Coasting after the maximum braking time is not supported
(P-0-0525, bit 1="0").
Selection
The safety function "Safe brake control" is implicitly selected when the special
mode "Safe standstill 1" (SMST1) and the special mode "Emergency stop"
(SMES) are selected at the end of the transition function SS1.
If configured, the safety function "Safe brake control" is automatically activated
at the end of the transition function "Safe stop 1 (SS1)".
With the safety function "Safe brake control" configured, the brake is only
controlled by the safety technology, i.e. the standard firmware cannot directly
control the brake any more.
Monitoring functions
The status parameter (P‑0‑3264.0.1, bit 0) indicates if the safety function is
activated.
The brake control status is displayed via the status word of the safe braking
and holding function (P-0-3265).
With the safety function "Safe brake control" activated, the panel shows
"SMST1" or "SMES" as the safe brake control is only activated in conjunc-
tion with the special mode "Safe standstill 1" (SMST1) or the special mode
"Emergency stopv (SMES).
If the safety function vSafe brake control" is active, the brakes controlled via
SBC are switched off via two channels. If an error in the brake switch-off is
detected, the drive generates the error F8353 .
Using the brake current, monitoring shows whether the brakes controlled via
SBC are available. If the drive detects that no brake has been connected, the
drive generates the error F8353 .
In
addition
to
the
safety
technology
monitoring
functions
with
"Safe brake control" configured, the standard firmware monitors the following:
Only an electrically releasing brake can be configured in parameter (P-0-0525),
otherwise the switching to the operating mode (OM) is prevented; the com-
mand error C0256 is generated.
Manually controlling (releasing) the brake
The brake can be controlled (released) with the command "C2000
Release motor holding brake command", if the command was enabled in
"P-0-0525, Holding brake control word".
If the safety function "Safe brake control" (SBC) is active (SMST1, SMES, error
state), the following conditions have to be additionally fulfilled:
● The functionality was enabled in (P-0-3265.0.1).
● With safety technology encoder evaluation activated, axis standstill is safely
detected (P-0-3256).
● The drive acknowledges safety (P‑0‑3237).
R911404905, Edition 02
Bosch Rexroth AG
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