Yaskawa Sigma-5 Series User Manual:: For Use with Large-Capacity Models-Setup. Rotary Motors - Manual (Page 50)

3 Wiring and Connection
3-2
3.1
Precautions for Wiring
CAUTION
• Be sure to wire correctly and securely.
Failure to observe this caution may result in motor overrun, injury, or malfunction.
• Do not connect a commercial power supply to the U, V, or W terminals for the ser-
vomotor connection.
Failure to observe this caution may result in injury or fire.
• Securely connect the main circuit terminals.
Failure to observe this caution may result in fire.
• Do not bundle or run the main circuit cables together with the I/O signal cables or
the encoder cables in the same duct. Keep them separated by at least 30 cm.
Failure to do so may result in malfunction.
• Use shielded twisted-pair wires or multi-core shielded twisted-pair wires for I/O
signal cables and encoder cables.
• Use the bus bars that are included with the converter, and connect the P and N
terminals on the SERVOPACK and converter securely.
• The maximum cable length is 3 m for I/O signal cables, 50 m for connection
cables for servomotor main circuit or encoder cables, and 10 m for control power
supply cables to 400-V converters (+24 V, 0 V).
• Do not touch the power terminals while discharging the main circuit’s capacitor,
because high voltage may still remain in the SERVOPACK and the converter. For
details on the charging time of the main circuit’s capacitor, refer to 3.2 Discharg-
ing Time of the Main Circuit’s Capacitor.
Before starting to do wiring or inspections, confirm that the power has been completely
discharged (charge indicator: OFF) by using a tester to measure the voltage between the P
and N terminals for DC power.
• Be sure to observe the following precautions when wiring the main circuit’s termi-
nals and connectors on a SERVOPACK or converter.
• Do not turn ON the power to a SERVOPACK or converter until all wiring, including
the wiring to the main circuit terminal connectors, has been completed.
• Remove main circuit connectors from the SERVOPACK and the converter before wir-
ing.
• Insert only one power line per opening in the main circuit terminals.
• Make sure that no part of the core wire comes into contact with (i.e., short-circuits)
adjacent wires.
• Install a battery at either the host controller or the battery unit of the encoder, but
not both.
It is dangerous to install batteries at both ends simultaneously, because that sets up a loop
circuit between the batteries.
• Always use the specified power supply voltage.
An incorrect voltage may result in fire or malfunction.
• Make sure that the polarity is correct.
Incorrect polarity may cause ruptures or damage.
• Take appropriate measures to ensure that the input power supply is supplied
within the specified voltage fluctuation range. Be particularly careful in places
where the power supply is unstable.
An incorrect power supply may result in damage to the product.
• Install external breakers or other safety devices against short-circuiting in external
wiring.
Failure to observe this caution may result in fire.