Siemens SINAMICS S120 Installation And Start-Up Manual page 43

Note
Before switching on the drive for the first time, check that the screws of the DC link
busbars are tightened to the specified torque (see SINAMICS S120 Equipment
Manual).
Residual risk
A risk assessment enables the machine manufacturer to determine the residual
risk for his machine with respect to the drive units. The following residual risks are
defined:
S Unexpected drive movement from standstill:
Caused, for example, by installation/operational errors or by a malfunction in
the higher-level controller, drive controller, encoder evaluator, or the encoder.
This residual risk can be significantly reduced by means of the "Safe standstill"
function (see Chapter 5, Safety Integrated).
S Unexpected change in speed/velocity during operation:
Caused, for example, by a malfunction in the higher-level controller, drive
controller, or encoder.
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Sequence of operations during commissioning
Commissioning
3-43