YASKAWA Sigma-V Series User Manual page 88

3 Wiring and Connection
3.11.1 Wiring for Noise Control
(1) Noise Filter
The multi-winding drive unit, SERVOPACKs, and converters have built-in microprocessors, so protect them
from external noise as much as possible by installing noise filters in the appropriate places.
The following is an example of wiring for noise control.
400 VAC
100/200 VAC
∗1. For ground wires connected to the ground plate, use a thick wire with a thickness of at least 2.0 mm
plain stitch cooper wire).
∗2.
∗3. When using a noise filter, follow the precautions in 3.11.2 Precautions on Connecting Noise Filter.
(2) Correct Grounding
Take the following grounding measures to prevent the malfunction due to noise.
 Grounding the Motor
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 main circuit of the
SERVOPACK and converter through the stray capacitance of the servomotor. To prevent the adverse effects of
switching noise, always connect the ground terminal
ground terminal
 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.
3-42
Noise filter ∗3
2
2.0 mm
min.
24-VDC
power supply
*3
Noise
filter
should be twisted-pair wires.
.
on the SERVOPACK.
SERVOPACKs and converters
(2 pairs)
L1
L2
L3
Multi-winding drive unit
CN101
+ 24V
-
0V
Operating relay sequence
Signal generation circuit
(not included)
*2
DC
power
supply
2
2.0 mm min.
(Ground plate)
*1
Ground: Ground to an independent ground
in the motor terminal box on the servomotor to the
Servomotor
U
M
V
(FG)
W
CN21 ENC
CN1
2
2.0 mm
min.
. Also be sure to
2
(preferably,