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26
Operating Instructions – Safety-Related BST Brake Module
7
Operating states
Startup
7
Startup
7.1
Operating states
• The brake is activated with the functional control voltage V
24 V in
when the DC link
voltage V
DC link
and the safety-related control voltage V
24 V safe
are present.
V
24 V in
is present
Ⳏ
Brake released.
V
24 V in
is not present
Ⳏ
Brake applied.
• If the safety-related control voltage V
24 V safe
is disconnected, the brake is safely de-
energized (
SBC
).
• If the DC link voltage V
DC link
is disconnected, the brake is de-energized.
The brake is released with high-sped excitation. Rapid brake application (DC and AC
switch-off) occurs when it is controlled using the V
24 V in
functional control voltage or the
V
24 V safe
safety-related control voltage.
The response time for releasing and applying the brake results from the response time
of the BST t
R
≤
6 ms and the response or application time of the brake connected. For
information on response or application times, refer to the applicable operating instruc-
tions for motors.
7.1.1
Brake module control under normal operating conditions, e.g. automatic operation of the plant
With a brake coil power of P
≥
70 W, you must ensure a timeout of at least 1 second for
brake control.
INFORMATION
Fast disconnection (cut-off in the DC circuit) of the brake by the BST module is not part
of the safety function (SBC). The brake application time for cut-off in the AC circuit
must therefore be used.
NOTICE
The brake module might be damaged if required off periods are not adhered to.
Damage to the drive system.
• Adhere to the required off periods for the brake module.
2950935051
toff
1s
toff
1s
toff
1s
toff
1s
ton
ton
ton
ton
t/s
Brake
control
signal
0
0
I
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