Siemens SINAMICS S120 Function Manual page 437

Example 3: Starting against a closed brake
When the device is switched on, the setpoint is enabled immediately (if the required enable
signals are issued), even if the brake has not yet been released (p1152 = 1). The factory setting
p1152 = r0899.15 must be separated here. The drive starts to generate torque against the
closed brake. The brake is not opened until the motor torque or current (p1220) has exceeded
braking threshold 1 (p1221). Depending on the type and design of the brake, the time required
to completely open the brake differs. Note that once the braking threshold torque has been
exceeded, the operation enabling signal (r0899.2) is interrupted while the brake is being
opened (p1216) to ensure that the motor current does not exceed the permissible limit values
during this period and/or the motor torque generated does not damage the brake. Interval
p1216 must be set on the basis of the time the brake actually requires to release.
Control and status messages for extended brake control
Table 9-2 Controller extended brake control
Signal name
Enable speed setpoint
Enable setpoint 2
Unconditionally open holding brake
Enable speed controller
Unconditionally close holding brake
Table 9-3 Status message of extended brake control
Signal name
Command, open brake (continuous sig‐
nal)
Pulse enable, extended brake control
Brake does not open
Brake does not close
Brake threshold exceeded
Value below brake threshold
Brake monitoring time expired
Request, pulse enable missing/n_ctrl in‐
hibited
Brake OR logic operation result
Brake AND logic operation result
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Binector input
p1142 BI: Enable speed setpoint
p1152 BI: Setpoint 2 enable
p0855 BI: Unconditionally open holding
brake
p0856 BI: Enable speed controller
p0858 BI: Unconditionally close holding
brake
Parameter
r1229.1
r1229.3
r1229.4
r1229.5
r1229.6
r1229.7
r1229.8
r1229.9
r1229.10
r1229.11
Function modules
9.3 Extended Brake Control
Control word sequence control / inter‐
connection parameters
STWA.6
p1152 = r0899.15
STWA.7
STWA.12
STWA.14
Brake status word
B_STW.1
B_STW.3
B_STW.4
B_STW.5
B_STW.6
B_STW.7
B_STW.8
B_STW.9
B_STW.10
B_STW.11
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