YASKAWA SGMJV User Manual page 84

3 Wiring and Connection
3.8.1 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.
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 3.8.2 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.
3-34
Noise filter ∗3
2
2.0 mm
min.
∗3
Noise
filter
should be twisted-pair wires.
.
SERVOPACK
L1
L2
L3
L1C
L2C
CN1
Operation relay
sequence
Signal generation
circuit (not included)
∗2
DC
power
2
2.0 mm
min .
(Ground plate)
∗1
Ground: Ground to an independent ground
Servomotor
U
M
V
(FG)
W
CN2 ENC
2
2.0 mm
min .
2
. Also be sure to
(preferably,