Handling Overview - Siemens SINUMERIK MC Commissioning Manual

Safety functions integrated in the drive
4.15 SBT
● Safety Integrated Extended Functions with encoder have been enabled.
You can find information about possible encoder concepts in Chapter "Safe actual value
acquisition (Page 191)".
Note
SBT only with encoder
The "Safe Brake Test" (SBT) diagnostic function can only be used with an encoder.
● Speed control with encoder (p1300 = 21).
SBT is not possible with encoderless speed control (e.g. vector V/f control) and torque
control. In this case, alarm A01784 is output.
● The pulses must be enabled when SBT is selected. The actual speed value must not exceed
1 % of the maximum speed (p1082) when SBT is selected and over the complete time that
SBT is active.
● The brake(s) must be open
4.15.1.2

Handling overview

Table 4-4
Step
1st
→
2nd
3rd
→
172
Selecting SBT
Procedure
In the associated axis DB, set bit "Start brake test" DBX11.0 = 1.
The NC checks that the appropriate conditions are satisfied:
● If the conditions are satisfied, then the "Brake test active" bit is set to 1 (DBX71.0 = 1).
● Alarm 27830 is output if the conditions are not satisfied.
Check whether the "Brake test active" bit (DBX71.0) is set to 1. It this is not the case, then it
is not permissible that you perform the SBT In this case, ensure that the requirements
(Page 171) are satisfied, and start again with step 1.
Select SBT via SCC by setting bit 0 "SELECTION_SBT" to 1 in STW3 (signal edge 0 => 1).
See also: Selection (Page 176)
In ZSW3, bit 1 "SETPOINT_SETTING_DRIVE" is set to 1 - which in the SIC signals that the
NC no longer enters the setpoint, but instead, DRV. The monitoring functions are deactivated
in the NC, and the setpoint is set the same as the actual value.
The brake test sequence is executed.
See also: Sequence (Page 177)
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB