General Precautions For Wiring - YASKAWA E-V-MD Series User Manual

5 Wiring and Connections

5.1.6 General Precautions for Wiring

5.1.6

General Precautions for Wiring

To ensure safe, stable application of the servo system, observe the following precautions when wiring.
Design and arrange the system so that each cable will be as short as possible.
• Use shielded twisted-pair cables or screened shielded twisted-pair cables for I/O signal cables and encoder
cables.
• The maximum wiring length is 3 m for I/O signal cables, 10 m for servomotor/encoder relay cables, and 10
m for power supply cables.
Observe the following precautions when wiring the ground.
• Use a cable as thick as possible.
• Ground to a ground resistance of 100 Ω or less.
• 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
sion.
5-10
• Always use a molded-case circuit breaker (1QF) or a fuse to protect the servo system
from intersystem faults.
• 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.
2 2
or 0.3 mm . Do not impose excessive bending force or ten-