5 Wiring
5.4.1 Wiring Precautions
5-12
5.4 Special Wiring
5.4.1 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
Dimensional Drawings of Cables and Peripheral Devices
Use cables that are as short as possible.
2. For the ground wire, use as thick a cable as possible (2.0 mm
2
(0.079 in
2
) or thicker).
• At least class-3 ground (100
Ω
max.) is recommended.
• Ground to one point only.
• If the motor is insulated from the machine, ground the motor 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 care-
fully.
4. Use a noise filter to prevent noise interference.
(For details, refer to
5.4.2 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.
• Since the SGDS 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 protector circuit in the relay, solenoid and electromagnetic contactor coils.
• The distance between a power line (such as the power supply line or motor cable) and a signal line must be
at least 30 cm (11.81 in). Do not put the power and signal lines in the same duct or bundle them together.
• Do not share the power circuit 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 SGDS SERVOPACK connects directly to a commercial without a transformer, so always use a QF or
fuse to protect the SERVOPACK from accidental high voltage.
7. The SGDS 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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