3.3 Precautions on Wiring
21
3.3
Precautions on Wiring
3.3.1 Protection for Power Supply Line
• Use a molded-case circuit breaker and fuse to protect the power supply line. The SERVOPACK con-
nects directly to a commercial power supply without a transformer, so always use a circuit breaker
and fuse to protect the servo system from accidental high voltage.
3.3.2 Caution for Grounding
Consider the following conditions when grounding the SERVOPACK.
• For a ground wire, use as thick a cable as possible (2.0 mm
2
or thicker).
• A ground resistance of 100 (
Ω
) or less is recommended.
• Ground to one point only.
2. The ground protection circuit is designed for ground fault inside the motor
windings while the motor is running. Therefore, it may not protect the system
under the following conditions.
• A low-resistance ground fault occurs between the main circuit cable and con-
nector for the servomotor.
• The power supply is turned ON during a ground fault.
To configure a safer system, install an earth leakage breaker for protection
against overloads and short-circuit, or install an earth leakage breaker for
ground protection combined with a wiring circuit breaker.
3. Position information is not stored in the SERVOPACK, so this information will be
lost if the power supply is turned OFF. If this information is required for the
operation of the host controller, make sure that the system has an emergency
stop signal (E-STP) that will stop operations without turning OFF the power
supply.
* 1. Prepare a 24 VDC power supply for sequence separately from the 24 VDC power supply for brake.
• Be sure to correctly ground the SERVOPACK and the servomotor.
• Wiring must be performed by an authorized person qualified in electrical work.
• Configure the circuit’s power supply to be automatically cut off if E-STP signal is OFF at occur-
rence of emergency stop. (Refer to
3.7.3 Emergency Stop Signal Input
.)
The residual voltage rotates the servomotor for a few seconds after the power supply has been
turned OFF, and may result in injury or damage to the equipment. Be sure to completely stop the
motor by turning OFF the servo using the emergency stop.
Position information is not stored in the SERVOPACK, so this information will be lost if the power
supply is turned OFF. This information cannot be read again if the power supply is turned OFF.
• When using the servomotor for a vertical axis, install safety devices to prevent workpieces from fall-
ing off because of alarms. Workpiece’s falling off may result in injury or malfunction.
• Configure the interlock circuit so that the system is interlocked to avoid injury whenever the protec-
tive cover on the machine is opened or closed.
WARNING
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