6 Wiring
6.4.1 Wiring Precautions
6-18
6.4 Others
6.4.1 Wiring Precautions
To ensure safe and stable operation, always observe the following wiring precautions.
1. For wiring for reference inputs and encoders, use the specified cables. Refer to Chapter 5 Specifications
and Dimensional Drawings of Cables and Peripheral Devices for details.
Use cables as short as possible.
2. For a ground wire, use as thick a cable as possible (2.0 mm
2
(0.003 in
2
) or thicker).
• At least class-3 ground (100 Ω max.) is recommended.
• Ground to one point only.
• If the servomotor is insulated from the machine, ground the servomotor directly.
3. Do not bend or apply tension to cables.
The conductor of a signal cable is very thin (0.2 to 0.3 mm (0.0079 to 0.012 in)), so handle the cables
carefully.
4. Use a noise filter to prevent noise interference.
(For details, refer to 6.4.2 Wiring for Noise Control.)
• If the equipment 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.
• Because the SERVOPACK is designed as an industrial device, it provides no mechanism to prevent
noise interference.
5. To prevent malfunction due to noise, take the following actions:
• Position the input reference device and noise filter as close to the SERVOPACK as possible.
• Always install a surge suppressor in the relay, solenoid and magnetic contactor coils.
• The distance between a power line (such as a power supply line or servomotor cable) and a signal line
must be at least 300 mm (11.81 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 generator, install a noise filter on the input side of the
power supply line.
6. Use a molded-case circuit breaker (QF) or fuse to protect the power supply line from high voltage.
• The SERVOPACK connects directly to a commercial power supply without a transformer, so always use
a QF or fuse to protect the SERVOPACK from accidental high voltage.
7. The SERVOPACKs do not have built-in ground protection circuits. To configure a safer system, install an
earth leakage breaker for protection against overloads and short-circuiting, or install an earth leakage
breaker combined with a wiring circuit breaker for ground protection.
IMPORTANT
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