Mazak VTC-160A, Руководство по обслуживанию

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6-15
6-4-2 Grounding
1. All electrical devices must be grounded in order to protect personnel and machines from
electrical hazards. Grounding must be carried out after the installation of the machine in
accordance with the standards for electrical equipment.
2. Ideally, the grounding point should be as close as possible to the machine.
Class 3 grounding requirements Class D (formerly class 3) grounding requirements
Grounding resistance: 100
Ω
max.
Power supply cable: Refer to the List of Total Power Requirements.
Measuring instrument: 500 V megger
l
The grounding work must be entrusted to an officially authorized electrical engineer.
Otherwise, serious injury, death, or accidents involving machine damage could result.
3. The machine must be grounded in one of the following ways.
A. Independent grounding
Grounding resistance at each point: No greater than 100
Ω
Fig. 6-1
B. Common grounding
The grounding conductor of each machine should be
directly connected to the grounding terminal.
Grounding resistance =
100
Number of machines
Ω
Fig. 6-2
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