July 2010 2 – 15
2 Safety Precautions
2.1 Overview
Ground
Zero potential
Fundamental
knowledge
Know-how and
competence
Suitable
tools
Safety precautions
of the machine
manufacturer
Regulations for
power installations
and instructions for
safety and prevent-
ion of accidents
Ensure that the equipment grounding conductor is continuous!
Interruptions in the equipment grounding conductor may cause damage to persons or
property.
Ensure that the main switch of the control is switched off and that connected devices are
not under power when you engage or disengage any connectors or terminals.
Take precautions against restart!
Use an appropriate voltage test unit to ensure that the unit is not under voltage!
In order to be able to judge the behavior of an NC controlled machine, service engineers
need to have fundamental knowledge of controls, encoders, drives, electronics and
mechanics.
Improper use can result in serious injury to persons and damage to equipment.
Technicians who work on the electrical system of the machine must have the required
know-how and competence!
Use suitable tools, e.g. insulated screwdrivers and pincers!
Note the safety precautions on the machine (e.g. labels, signs) and the safety precautions
in the documentation of the machine manufacturer (e.g., operating instructions).
Observe the national regulations for power installations and the general instructions for
safety and prevention of accidents!
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