Siemens SINAMICS S120 - SBT (Diagnostic Function)

Commissioning
4.10 Safety Integrated commissioning
Commissioning with Startdrive
246 Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
Configuring SBR
1. Select the setting "with SAM" in the "Monitoring" drop-down list in the "SS1" or "SS2"
screen form.
The "SBR (Safe Brake Ramp)" dialog opens.
2. Enter the required values in the input fields.
– Reference velocity (p9581)
– SAM velocity limit (p9568)
– STO shutdown speed (p9560)
– Delay time (p9582)
– Brake ramp monitoring time (p9583)
– Ramp-down time (OFF3) (p1135[0])
– Maximum speed (p1082[0])
3. Confirm your entry with "OK".
The dialog closes.
4.10.4.7
SBT (diagnostic function)
The diagnostic function "Safe Brake Test" ("SBT") checks the holding torque of a brake
(operating or holding brake). The drive purposely generates a configurable torque against
the applied brake. If the brake is operating correctly, the axis movement remains within a
parameterized tolerance. However, if a larger axis movement is identified from the encoder
actual values, the brake is not in a position to provide the specified holding torque. The brake
must now be serviced or replaced.
Precondition
● The "Safe Brake Test" (SBT) diagnostic function can only be used with an encoder.
Features
The "SBT" diagnostic function has the following properties:
● The parameters of the "SBT" function are protected by the safety password, and can only
be changed in the safety commissioning mode.
● Using this function, brakes can be tested that are directly connected to the
SINAMICS S120 (integrated brake control), but also externally controlled brakes (e.g. via
a PLC).