3 Wiring and Connection
3.7.1 Wiring for Noise Control
3-42
(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 3.5 mm
2
(preferably, plain stitch cooper wire).
∗2. should be twisted-pair wires.
∗3. When using a noise filter, follow the precautions in 3.7.2 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 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 Line
If the I/O signal line receives noise, ground the 0 V line (SG) of the reference input line. If the main circuit
wiring for the motor is accommodated in a metal conduit, ground the conduit and its junction box. For all
grounding, ground at one point only.
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