Example - Siemens SINUMERIK 840D sl Function Manual

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Connecting Sensors/Actuators

7.4 Safe brake test (SBT)

Example

An example of incorrect parameterization that results in Alarm 20095, "Axis %1

impermissible holding torque, measured torque %2" is shown in the following dia-

gram: The torque due to weight in drive parameter p1532 has been parameterized

considerably lower than the measured torque m

, positioned symmetrically around this MD, would mean that the drive would

not be able to produce the required holding torque for this axis (p1532+m

lower than m

Example of incorrect parameterization

If parameter p1532 cannot be sensibly parameterized for all situations where the

brake test is to be carried out, then the automatic determination of the load torque

must be activated using MA_SAFE_BRAKETEST_CONTROL.

Commissioning

To support the commissioning of the brake test Alarm 20096, "Axis %1 brake test

aborted, additional info %2" can be enabled using bit 5 in machine data

$MN_ENABLE_ALARM_MASK. This alarm supplies detailed information if the

brake test is interrupted.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition

. The calculated torque limit

Upper torque limiting + m

Lower torque limiting – m

Sinamics s120