FANUC Series 16/18/160/180-Model C Connection Manual (Hardware)

3. INSTALLATION
B–62753EN/01
24
The following ground systems are provided for the CNC machine tool:
Signal ground system (SG)
The signal ground (SG) supplies the reference voltage (0V) of the
electrical signal system.
Frame ground system (FG)
The frame ground system (FG) is used for safety, and suppressing
external and internal noises. In the frame ground system, the frames,
cases of the units, panels, and shields for the interface cables between
the units are connected.
System ground system
The system ground system is used to connect the frame ground
systems connected between devices or units with the ground.
Power
magnet-
ics
unit
Servo
amplifier
CNC
control
unit
Power
magnetics
cabinet
Distribution board
Operator’s
panel
Machine
tool
System ground system
Frame ground system
Signal ground system
Connect the signal ground with the frame ground (FG) at only one
place in the CNC control unit.
The grounding resistance of the system ground shall be 100 ohms or
less (class 3 grounding).
The system ground cable must have enough cross–sectional area to
safely carry the accidental current flow into the system ground when
an accident such as a short circuit occurs.
(Generally, it must have the cross–sectional area of the AC power cable
or more.)
Use the cable containing the AC power wire and the system ground
wire so that power is supplied with the ground wire connected.
3.7.2
Ground
   
 

Leave a Reply

Your email address will not be published. Required fields are marked *