Safe Brake Test (Sbt) - Siemens SINUMERIK Series Function Manual

Function Safely-Limited Position (safely limited position, SLP) is used to safely monitor the
limits of two traversing or positioning ranges that are switched between using a safe signal.
Examples of how the function can be used
● Limiting the traversing range of an axis without using a hardware limit switch.
Features
● Selection via terminals
● 2 position ranges, each defined by a limit switch pair
● Safe switchover between the two position ranges
● Adjustable stop response
● To move the motor out of the unauthorized range, you must execute a special sequence.
Preconditions
● The function is only available with a suitable encoder.
● The drive must be safely referenced (using "Reference point approach" and user
agreement).
2.3.10

Safe Brake Test (SBT)

The "Safe Brake Test" function (SBT) checks the required holding torque of a brake
(operational or holding brake). The drive purposely generates a force/torque against the
applied brake. If the brake is operating correctly, the axis motion remains within a
parameterized tolerance. If, however, a larger axis motion is detected, it must be assumed
that the braking force/torque has deteriorated and maintenance is required.
The "Safe Brake Test" function allows a safe test of up to two brakes:
● 1 motor holding brake and 1 external brake
● 2 external brakes
● 1 motor holding brake
● 1 external brake
Safety Integrated
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
Overview of Safety Integrated functions
2.3 Safety Integrated Extended Functions
45