
B–64193EN/01
3. INSTALLATION
23
The CNC machine tool uses the following three types of grounding:
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.
CNC
LCD–mounted type i series CNC
Distributed
I/O
αi amplifier
AC power
supply
24–V power
supply
AC input
PE (ground plate of cabinet)
Pendant box
Frame
Operator’s
panel
Pendant box
Cabinet on machine side
Path for grounding
Path for protective grounding (PE)
D The ground resistance in protective grounding (PE) must be 100 Ω 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 short–circuit 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.
3.5.2
Ground
Notes on grounding