Others; Wiring Precautions - YASKAWA E-II Series User Manual

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 5 Specifications and
IMPORTANT
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
• 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), 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
• Because the SERVOPACK is designed as an industrial device, it provides no mechanism to prevent noise
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 absorber 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
• Do not share the power supply with an electric welder or electrical discharge machine. When the SERVO-
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
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.
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the input side of the power supply line.
interference.
be at least 300 mm. Do not put the power and signal lines in the same duct or bundle them together.
PACK is placed near a high-frequency generator, install a noise filter on the input side of the power supply
line.
QF or fuse to protect the SERVOPACK from accidental high voltage.
2
or thicker).

6.4 Others

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