5 Wiring and Connections
5.6.1 Wiring for Noise Control
5-24
5.6 Noise Control and Measures for Harmonic Suppression
This section describes the wiring for noise control and the DC reactor for harmonic suppression.
5.6.1 Wiring for Noise Control
The SERVOPACK uses microprocessors. Therefore it may receive switching noise from peripheral devices.
To prevent the noise from the SERVOPACK or the peripheral devices from causing a malfunction of any one
of these devices, take the following precautions against noise as required.
• Position the input reference device and noise filter as close to the SERVOPACK as possible.
• Always install a surge absorber in the relay, solenoid and electromagnetic contactor coils.
• Do not share the power supply with an electric welder or electrical discharge machine. When the SERVO-
PACK is placed near a high-frequency generator, install a noise filter on the input side of the power supply
cables. For the connection method for the noise filter, refer to 5.6.1, (1) Noise Filter.
• Perform the grounding measures correctly. For the grounding measures, refer to
5.6.1
,
(2) Correct Grounding
.
(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 (preferably, plain stitch copper wire).
∗2. should be twisted-pair wires.
∗3. When using a noise filter, follow the precautions in 5.6.2 Precautions on Connecting Noise Filter.
∗4. The box () is replaced by a number. For a type A01 SERVOPACK, the number is 4. For a type A02 SERVOPACK,
the number is 8.
• Because the SERVOPACK is designed as an industrial device, it provides no mecha-
nism to prevent noise interference.
• The SERVOPACK uses high-speed switching elements in the main circuit. Therefore
peripheral devices may receive switching noise. If the equipment is to be used near
private houses or if radio interference is a problem, take countermeasures against
noise.
SERVOPACK
U
V
W
M
(FG)
CN11 to 1
*4
ENC
CN1
CN32
L2C
L1C
CN31
L2
L1
AC/DC converter for
main circuit power supply
AC/DC converter for
control power supply
Operation relay sequence
Signal generation
circuit (not included)
AC power
supply
Noise filter
*3
Ground: Ground to an independent ground
(Ground plate)
*1
AC/DC converter
*3
*2 *2
*2
2.0 mm
2
min.
2.0 mm
2
min.
2.0 mm
2
min.
2.0 mm
2
min.
0.5 mm
2
Noise filter
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