In the individual chapters of this document, you will find safety instructions that must be obeyed
absolutely, for your own safety, to protect other people and to avoid damage to property. Pay
attention to the following safety instructions for all activities on the inverter.
The product/system described in this documentation may only be operated by personnel
qualified for the specific task in accordance with the relevant documentation for the specific
task, in particular its warning notices and safety instructions. Because of their training and
experience, qualified personnel can recognize any risks involved with handling these products/
systems and avoid any possible dangers.
The five safety rules
For your personal safety and to prevent material damage when carrying out any work, always
observe the safety instructions and the following five safety rules, according to EN 50110‑1
"Dead working". Apply the five safety rules in the sequence stated before starting work.
Five safety rules
1. Disconnect completely.
2. Secure against reconnection.
3. Verify absence of operating voltage.
4. Carry out earthing and short-short-circuiting.
5. Provide protection against adjacent live parts.
To energize the system, apply the measures in reverse order.
SINAMICS SM120 6SL38715
Operating Instructions 07/2015
Disconnect the auxiliary circuits, for example anti-condensation heating.