2. HARDWARE
B–63505EN/02
120
Cable of group B, C
Cable of group A
Cabinet
Spindle
amp.
Servo
amp.
Control
unit
Duct
To operator’s
panel,
motor, etc.
Section
Group A Group B, C
Cover
The following ground systems are provided for the CNC machined tool:
1. Signal ground system (SG)
The signal ground (SG) supplies the reference voltage (0V) of the
electrical signal system to the machine.
2. 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
and cases of the units, panels, and shields for the interface cables
between the units are connected.
3. System ground system
The system ground system is used to connect the frame ground
systems connected between devices or units with the ground.
Power
mag-
netics
unit
Servo
amplifier
CNC
control
unit
Machine
tool
Operator’s
panel
Distribution board
Power magnet-
ics cabinet
Signal ground system
Frame ground system
System ground system
2.11.2
Ground