3.1 Main Circuit Wiring
3-11
3
Wiring and Connection
3.1.3
General Precautions for Wiring
To ensure safe, stable application of the servo system, observe the following precautions when wiring.
Use the connecting cables specified in the
Σ
-V Series Product Catalog
(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 signal cables and linear scale
connection cables.
• The maximum cable length is 3 m for the I/O signals, 20 m for the 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 SERVOPACKs with a power supply of 100 V or 200 V and
10
Ω
or less for SERVOPACKs with a power supply of 400 V 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 config-
ure a safer system, install a ground fault detector against overloads and short-circuit-
ing, or install a ground fault detector combined with a molded-case circuit breaker.
Do not turn power ON and OFF frequently.
• The power supply in the SERVOPACK contains a capacitor, which causes a high
charging current to flow when power is turned ON. Frequently turning power ON and
OFF will causes the main circuit elements in the SERVOPACK to deteriorate.
