26 (1) noise filter, 2) correct grounding, Grounding the motor frame – Yaskawa Σ-V Series AC Servo Drives Rotational Motor MECHATROLINK-III User Manual
Page 63: Noise on the i/o signal cable
3 Wiring and Connection
3.7.1 Wiring for Noise Control
3-26
(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.
∗1.
For ground wires connected to the ground plate, use a thick wire (preferably, plain stitch cooper wire).
∗2.
should be twisted-pair wires.
∗3.
When using a noise filter, follow the precautions in
3.7.2 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 . Also be sure to
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.
U
V
W
M
(FG)
CN4
ENC
CN2
CN1
CN3
C2
C1
L2
L1
Non-isolated AC/DC converter
for main circuit power supply
Non-isolated AC/DC converter
for control power supply
AC power
supply
*3
*1
AC/DC converter
*3
*2
*2
*2
0.5 mm
2
SERVOPACK
Operation relay sequence
Signal generation
circuit (not included)
(Ground plate)
Noise filter
Noise filter
Ground: Ground to an independent ground
2.0 mm
2
min.
2.0 mm
2
min.
2.0 mm
2
min.
2.0 mm
2
min.