YASKAWA Σ-V Series User Manual page 84

(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 *3
200 VAC
2
2.0 mm
*1
min.
∗1. For ground wires connected to the ground plate, use a thick wire with a thickness
of at least 2.0 mm
∗2.
should be twisted-pair wires.
∗3. When using a noise filter, follow the precautions in 3.8.2 Precautions on Con-
necting Noise Filter.
(2) Correct Grounding
Take the following grounding measures to prevent the malfunction due to noise.
Grounding the Motor Frame
Always connect linear servomotor frame terminal FG to the SERVOPACK ground terminal
to ground the ground terminal
If the liniear servomotor is grounded via the machine, a switching noise current will flow from the SERVO-
PACK main circuit through linear servomotor stray capacitance. The above grounding is required to prevent
the adverse effects of switching noise.
Noise on the I/O Signal Line
If the I/O signal lines are affected by noise, ground the 0 V (SG) terminal of I/O signal. If the main circuit wir-
ing for the motor is in a metal conduit, ground the conduit and its junction box. For all grounding, ground at
one point only.
Operation relay
sequence
Signal generation
circuit (not included)
*3 *2
Noise DC
power
Filter
2
2.0 mm min.
*1
Ground: Ground to an independent ground
2
(preferably, plain stitch cooper wire).
.
3.8 Noise Control and Measures for Harmonic Suppression
SERVOPACK
L1
CN2
L2
L3
Linear servomotor
U
V
L1C
W
L2C
CN1
2
2.0 mm
min .
(Ground plate)
ENC
M
(FG)
. Also be sure
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3