YASKAWA SGMAH - Wiring for Noise Control

Sigma II User’s Manual Chapter 5: Parameter Settings and Functions
5-116
5.8.2 Wiring for Noise Control
 Wiring Example
This servo amplifier uses high-speed switching elements in the main circuit. It may
receive “switching noise” from these high-speed switching elements if wiring or
grounding around the servo amplifier is not appropriate. To prevent this, always
wire and ground the servo amplifier correctly.
This servo amplifier has a built-in microprocessor (CPU). To protect it from
external noise install a noise filter in the appropriate place.
The following is an example of wiring for noise control.
Notes: 1. When using a noise filter, follow the precautions in Using Noise Filters on the following page.
2. For ground wires connecting to the casing, use a wire with a thickness of at least 0.005in
2
(3.5mm
2
), preferably a braided flat copper wire.
 Correct Grounding
Grounding the Motor Frame
Always connect servomotor frame terminal FG to the servo amplifier ground
terminal . Also be sure to ground the ground terminal .
If the servomotor is grounded via the machine, switching noise current will flow
from the servo amplifier power unit through motor stray capacitance. The
grounding of the motor frame is required to prevent the adverse effects of switching
noise.
M
(FG)
U
W
V
L2
L1
L3
L2C
L1C
CN2
CN1
Servomotor
P
P
P
1LF*
AVR
(Ground)
(Casing)
(Casing)
(Casing)
(Casing)
2LF
(Casing)
AC200V
PG
Noise filter***
Servo amplifier
P: Indicates twisted pair wires
•Operation relay
sequence
•Signal generation
circuit (provided
by user)
0.003in.
2
(2mm
2
) minimum
2)
0.003in.
2
0.005in
2
(3.5mm
2
)minimum
(2mm
2
)
minimum
0.005in
2
(3.5mm
2
)
minimum
Wires of 0.005in
2
(3.5mm
2
)minimum
0.005in.
2
(3.5mm
2
)
minimum