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1.2
Safety Precautions
1 – 6
DANGER
Ensure that the main electrical disconnect switch of the machine and the measuring system
are switched off before connecting or disconnecting any plugs or terminals.
DANGER
Ensure that the grounding conductor is connected.
Any interruption of the protective ground can result in serious injury to persons and damage
to equipment.
DANGER
Incorrect or non-optimized input values can lead to faulty machine performance and
therefore to serious injury to persons and damage to equipment.
Machine parameters may be altered only by the machine manufacturer or after consultation
with the machine manufacturer.
Caution
Service personnel must possess a comprehensive knowledge about drives, inverters,
NC controls and measuring systems for correct evaluation of the malfunction of an
NC controlled machine.
Improper use can result in serious injury to persons and damage to equipment.
HEIDENHAIN can accept no responsibility for direct or indirect damage or injury caused to
property or persons through improper use or incorrect operation of the machine.
DANGER
The interfaces for PLC inputs and outputs, machine operating panel and PL connection
comply with the regulations for basic insulation according to IEC 742 EN 50 178.
All connected devices must comply with the regulations for basic insulation in IEC 742 EN
50 178 . Failure to follow this instruction can result in serious injury to persons and damage
to equipment.
The maximum mean dc voltage for PLC inputs is 31 V.
HEIDENHAIN Service Manual TNC 426/430 C/P/M
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