YASKAWA SGDV SERVOPACK, User Manual

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3 Wiring and Connection
3.1.6 General Precautions for Wiring
3-16
3.1.6
General Precautions for Wiring
To ensure safe, stable application of the servo system, observe the following precautions when wiring.
• Use the connection cables specified in the

-V Series Product Catalog (No.: KAEP S800000 42). Design
and arrange the system so that each cable will be as short as possible.
• Use shielded twisted-pair cables or screened unshielded twisted-pair cables for I/O signal cables and linear
scale connection cables.
• Make sure that the length of each cable is equal to or shorter than the maximum wiring length listed here.
• I/O signal cables: 3 m
• Connection cables for linear servomotor main circuit: 20 m
• Connection cables for serial converter unit: 20 m
• Connection cables for linear scale: 15 m
• Connection cables for hall sensor: 15 m
• Control power supply cables for the SERVOPACK with a 400-V power supply (+24 V, 0 V):10 m

• Observe the following precautions when wiring the ground.
• Use a cable as thick as possible (at least 2.0 mm
2
).
• Grounding to a resistance of 100

or less for 100-V, 200-V SERVOPACKs, 10

or less for 400-V SER-
VOPACKs is recommended.
• Be sure to ground at only one point.
• Ground the servomotor directly if the servomotor is insulated from the machine.
• The signal cable conductors are as thin as 0.2 mm
2
or 0.3 mm
2
. Do not impose excessive bending force or
tension.
• Use a molded-case circuit breaker (1QF) or fuse to protect the main circuit.
The SERVOPACK connects directly to a commercial power supply; it is not isolated
through a transformer or other device.

Always use a molded-case circuit breaker (1QF) or fuse to protect the servo system
from accidents involving different power system voltages or other accidents.
• Install a ground fault detector.
The SERVOPACK does not have a built-in protective circuit for grounding.

To configure a safer system, install a ground fault detector against overloads and
short-circuiting, or install a ground fault detector combined with a molded-case circuit
breaker.
• Do not turn the power ON and OFF more than necessary.
• Do not use the SERVOPACK for applications that require the power to turn ON and
OFF frequently. Such applications will cause elements in the SERVOPACK to dete-
riorate.
• As a guideline, at least one hour should be allowed between the power being
turned ON and OFF once actual operation has been started.