Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - MECHATROLINK-II Communications Reference - Manual (Page 83)

3 Wiring and Connection
3.8.1 Wiring for Noise Control
3-34
(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 with a thickness of at least 2.0 mm 2 (preferably,
plain stitch cooper wire).
∗2. should be twisted-pair wires.
∗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 . 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
W
V
L2
L1
L3
L2C
L1C
CN2
CN1
ENC
(FG)
M
SERVOPACK
Servomotor
Operation relay
sequence
Signal generation
circuit (not included)
DC
power
(Ground plate)
2.0 mm
min. 2
200 VAC
Noise filter ∗3
∗3 ∗2
2.0 mm 2
min .
Ground: Ground to an independent ground
Noise
filter
2.0 mm 2
min .
∗1