Siemens Sinumerik 840D sl Function Manual page 332

Sinumerik safety integrated

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Table of Contents

Connecting Sensors/Actuators

7.6 Safe Brake Test (SBT)

Sequence to test the mechanical braking

Before the brake test can be started via FB 11 (from the basic program), the NC

axis to be tested must be transferred to the PLC as "PLC--controlled axis" During

the complete test, the axis must remain a PLC--controlled axis. Start via FB 11 can

be made after the transfer to the PLC.

The start parameter of the FB 11 must be continuously at 1 during the complete

test. With MD36968 $MA_SAFE_BRAKETEST_CONTROL bit 0 =1, shortly before

the brake is closed, the actual holding torque is determined and is temporarily used

in the drive as average value for the torque limiting. After the brake is closed, the

PLC--controlled axis is traversed in the specified direction against the brake using

FC 18. If the fixed stop is detected ("Fixed stop reached" DB31--DB61, DBX62.5),

the PLC interrupts the traversing motion (FC 18 is exited with error 30).

The reduced torque limits are withdrawn and the brake is re--opened.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

Sinamics s120