3.8 Noise Control and Measures for Harmonic Suppression
3-37
3
Wiring and Connection
(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 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 . Also be sure
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.
U
W
V
L2
L1
L3
L2C
L1C
CN2
CN1
ENC
(FG)
M
SERVOPACK
Operation relay
sequence
Signal generation
circuit (not included)
Noise
Filter
DC
power
(Ground plate)
2.0 mm
min.
2
200 VAC
Noise filter *3
*1
*3
*2
2.0 mm
2
min .
Ground: Ground to an independent ground
2.0 mm min.
2
*1
Linear servomotor
