Residual Risks Of Power Drive Systems; Carrying Out Of Repairs - Siemens SINUMERIK 808D Service Manual

1.1.4

Residual risks of power drive systems

When assessing the machine- or system-related risk in accordance with the respective local regulations (e.g., EC Machinery
Directive), the machine manufacturer or system installer must take into account the following residual risks emanating from
the control and drive components of a drive system:
1. Unintentional movements of driven machine or system components during commissioning, operation, maintenance, and
repairs caused by, for example,
– Hardware and/or software errors in the sensors, control system, actuators, and cables and connections
– Response times of the control system and of the drive
– Operation and/or environmental conditions outside the specification
– Condensation/conductive contamination
– Parameterization, programming, cabling, and installation errors
– Use of wireless devices/mobile phones in the immediate vicinity of electronic components
– External influences/damage
– X-ray, ionizing radiation and cosmic radiation
2. Unusually high temperatures, including open flames, as well as emissions of light, noise, particles, gases, etc., can occur
inside and outside the components under fault conditions caused by, for example:
– Component failure
– Software errors
– Operation and/or environmental conditions outside the specification
– External influences/damage
3. Hazardous shock voltages caused by, for example:
– Component failure
– Influence during electrostatic charging
– Induction of voltages in moving motors
– Operation and/or environmental conditions outside the specification
– Condensation/conductive contamination
– External influences/damage
4. Electrical, magnetic and electromagnetic fields generated in operation that can pose a risk to people with a pacemaker,
implants or metal replacement joints, etc., if they are too close
5. Release of environmental pollutants or emissions as a result of improper operation of the system and/or failure to
dispose of components safely and correctly
6. Influence of network-connected communication systems, e.g. ripple-control transmitters or data communication via the
network
For more information about the residual risks of the drive system components, see the relevant sections in the technical user
documentation.
1.2

Carrying out of repairs

DANGER
Carrying out of repairs
Anywhere in the automation equipment where faults might cause physical injury or major material damage, in other words,
where faults could be dangerous, additional external precautions must be taken, or facilities must be provided, that
guarantee or enforce a safe operational state, even when there is a fault (e.g. using an independent limit value switch,
mechanical locking mechanisms, EMERGENCY STOP/EMERGENCY OFF devices).
Service Manual
01/2017
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