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3. Safety instructions
11
3.6 Warning of special risks
Electrical power
Attention: external voltage:
If external electrical circuits which cannot be cut out by
the main switch are connected to the control, these
external electrical circuits must be identified in
accordance with EN 60204. Warning signs must be
fixed near the main switch and near these electrical
circuits. In addition, these conductors must be laid
separately and/or colour-coded.
Use only original fuses with the specified current rating.
Switch off the control immediately if a fault occurs in the
electrical system.
Work on the electrical system or equipment may only
be carried out by a skilled electrician or by specially
instructed personnel under the control and supervision
of such an electrician and in line with the relevant
electrical engineering rules.
If regulations require, the power supply to parts of
machines and plants on which inspection, maintenance
and repair work is to be carried out must be cut off.
Before starting any work, check the de-energized parts
for the presence of power and earth or short-circuit
them in addition to insulating adjacent live parts and
elements.
The electrical equipment of the control must be
inspected and checked at regular intervals. Defects
such as loose connections or scorched cables must be
rectified immediately.
Necessary work on live parts and elements must be
carried out in the presence of a second person who can
cut off the power supply in case of danger by operating
the emergency shutdown or main power switch. Secure
the working area with a red-and-white safety chain and
a warning sign. Use insulated tools only.
Before starting work on high-voltage assemblies and
after having cut off the power supply, the feeder cable
must be earthed, and components such as capacitors
short-circuited with an earthing rod.
Gas, dust, steam, smoke
Carry out welding, flame-cutting and grinding work on
the control only if this has been expressly authorized,
as there may be a risk of explosion and fire.
Before carrying out welding, flame-cutting and grinding
operations, clean the control and its surroundings to
remove dust and inflammable substances and make
sure that the premises are adequately ventilated (risk of
explosion).
Adhere to the regulations in force for the place of
operation.
Observe any existing national regulations if work is to
be carried out in confined spaces.