Yaskawa Sigma-5 User Manual: Setup for Linear Motors - Manual (Page 119)

3.3 Main Circuit Wiring
3-35
3
Wiring and Connection
3.3.6 General Precautions for Wiring
To ensure safe, stable application of the servo system, observe the following precau-
tions when wiring.
Use the connecting cables specified in the Σ -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 wires or shielded multi-core twisted-pair wires for I/O
signal cables and the linear scale connection cables.
• The maximum cable length is 3 m max. for I/O signal cables, 20 m max. for linear
servomotor main circuit, 20 m for the serial converter unit, 15 m for the linear
scale, and 15 m for the hall sensor.
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 Ω or less for 100-V, 200-V SERVOPACKs, 10 Ω
or less for 400-V SERVOPACK is recommended.
• Be sure to ground at only one point.
• Ground the linear servomotor directly if the linear 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 in combination with a molded-case circuit breaker.
• Do not frequently turn power ON and OFF.
• Frequently turning power ON and OFF will causes elements
inside the SERVOPACK to deteriorate. Do not use the servo
drives for an application that requires frequently turning ON and
OFF the power supply.
• After the actual operation starts, the allowable interval for turn-
ing ON and OFF is one hour or longer.