FANUC Power Mate i-MODEL H CONNECTION MANUAL (HARDWARE)

3. INSTALLATION
B63173EN/03
18
The following ground systems are provided for the machine :
D Signal grounding
Signal grounding supplies a reference potential (0 V) for electrical
signals.
D Grounding for protection
Grounding for protection is performed for safety reasons as well as to
shield against external and internal noise. This type of grounding
includes, for example, the equipment frames, cases and panels of
units, and the shielding on interface cables connecting the equipment.
D Protective grounding (PE)
Protective grounding (PE) is performed to connect protection grounds
provided for equipment or between units to ground together at one
point as a grounding system.
Setting and
display unit
Distributed
I/O
α amplifier
AC power
supply
24V power
supply
AC input
PE (ground plate of cabinet)
CNC
Cabinet on machine side
Frame
Frame
Operators
panel
Path for grounding
Path for protective grounding (PE)
Pendant box
D The ground resistance in protective grounding (PE) must be 100 or
less (type D grounding).
D The cable used for protective grounding (PE) must be of a sufficient
cross section to allow current to flow safely into protective ground
(PE) if an accident such as a shortcircuit occurs. (Generally, a cross
section equal to or greater than that of the AC power cable is required.)
D The cable connected to protective ground (PE) must be incorporated
into the AC power wire such that power cannot be supplied with the
ground wire disconnected.
3.6.2
Ground
Notes on grounding

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