SMC Networks LECYU Series, Руководство по эксплуатации

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3 Wiring and Connection
3-13
3.1.6 General Precautions for Wiring
• Use a molded-case circuit breaker (1QF) or fuse to protect the main circuit.
The DRIVER 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 DRIVER 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 DRIVER for applications that require the power to turn ON and OFF
frequently. Such applications will cause elements in the DRIVER to deteriorate.
• As a guideline, at least one hour should be allowed between the power being
turned ON and OFF once actual operation has been started.
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 unshielded twisted-pair cables for I/O signal cables and
encoder cables.
•
The maximum wiring length is 3 m for I/O signal cables, 50 m for encoder cables or motor cables.
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 200-V DRIVER 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.