YASKAWA SGDV User Manual page 63

3 Wiring and Connection
3.6.1 Wiring for Noise Control
(1) Noise Filter
The SERVOPACK has a built-in microprocessor (CPU), so protect it from external noise as much as possible
by installing a noise filter in the appropriate place.
The following is an example of wiring for noise control.
Noise filter
AC power
supply
2.0 mm
min.
∗1. For ground wires connected to the ground plate, use a thick wire (preferably, plain stitch cooper wire).
∗2.
∗3. When using a noise filter, follow the precautions in 3.6.2 Precautions on Connecting Noise Filter.
(2) Correct Grounding
Take the following grounding measures to prevent the malfunction due to noise.
Grounding the Motor Frame
Always connect servomotor frame terminal FG to the SERVOPACK ground terminal
ground the ground terminal
If the servomotor is grounded via the machine, a switching noise current will flow from the SERVOPACK
main circuit through servomotor stray capacitance. The above grounding is required to prevent the adverse
effects of switching noise.
Noise on the I/O Signal Cable
If the I/O signal cable receives noise, ground the 0 V line (SG) of the I/O signal cable. If the servomotor main
circuit cable is accommodated in a metal conduit, ground the conduit and its junction box. For all grounding,
ground at one point only.
3-28
*3
2
Noise filter
*2
*2
should be twisted-pair wires.
.
Non-isolated AC/DC converter
for main circuit power supply
Non-isolated AC/DC converter
for control power supply
2
2.0 mm 2
2.0 mm
min.
min.
*3
AC/DC converter
*2
2
2.0 mm
0.5 mm
min.
*1
Ground: Ground to an independent ground
SERVOPACK
CN3 CN4
L1
U
L2
V
W
C1
C2
CN2
CN1
Operation relay sequence
Signal generation
circuit (not included)
2
(Ground plate)
. Also be sure to
M
(FG)
ENC