3.8 Special Wiring
137
NOTE Use a noise filter to prevent noise interference.
(For details, refer to the following Caution.)
• If the servo is to be used near private houses or
may receive noise interference, install a noise
filter on the input side of the power supply line.
Since this Servopack is designed as an indus-
trial device, it provides no mechanism to prevent
noise interference.
NOTE To prevent malfunction due to noise, take the following actions:
• Position the input reference device and noise filter as close to the Servopack as pos-
sible.
• Always install a surge absorber circuit in the relay, solenoid and magnetic contactor
coils.
• The distance between a power line (such as a power supply line or motor cable) and a
signal line must be at least 30 cm (12 in). Do not put the power and signal lines in the
same duct or bundle them together.
• Do not share the power supply with an electric welder or electrical discharge machine.
When the Servopack is placed near a high-frequency oscillator, install a noise filter on
the input side of the power supply line.
Note a) Since Servopack uses high-speed switching elements, signal lines may re-
ceive noise. To prevent this, always take the above actions.
b) For details of grounding and noise filters, refer to 3.8.2 Wiring for Noise Con-
trol.
NOTE Use a molded-case circuit breaker (MCCB) or fuse to protect the power supply line from high
voltage.
• This Servopack is directly connected to com-
mercial power supply without a transformer.
Always use an MCCB or fuse to protect the ser-
vo system from accidental high voltage.
• Select an appropriate MCCB or fuse according
to the Servopack capacity and the number of
Servopacks to be used as shown below.
3
Noise filter
MCCB
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