Fanuc Power Mate i-D/H Maintenance Manual

B63175EN/03
2. HARDWARE
227
The following ground systems are provided for the machine :
D Signal ground
Signal ground connects the reference potential (0 V) to the electrical
signals to ground.
D Protection grounding
Protection grounding is used for safety and suppressing noise. More
specifically, protection grounding is provided by the unit frames, cases
of the units, panels, and shields of the interface cables that connect the
units.
D Protection grounding (PE)
Protection grounding (PE) connects the protection ground
connections provided for each unit or between units to ground at one
point.
D The grounding resistance of the protection grounding (PE) shall be
100 ohms or less (class D grounding).
D The protection grounding (PE) cable must have enough
crosssectional area to safely carry the accidental current flow into the
protection grounding (PE) when an accident such as a short circuit
occurs.
(Generally, it must have the crosssectional area of the AC power
cable or more.)
D Use the cable containing the AC power wire and the protection
grounding (PE) wire so that power is supplied with the ground wire
connected.
2.14.2
Ground
Notes on connecting the
ground systems

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