Fuji Electric ALPHA7, User Manual

Page: 27 / 662

CHAPTER 0 INTRODUCTION
0-6
Safety Precautions
0
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Precautions on wiring
CAUTION

Never apply the commercial power supply to the U, V and W terminals of the servomotor.
It might cause fire and failure.

Do not connect the grounding (E) cable to the U, V and W terminals of the servomotor. Do not
connect the U, V and W terminals in inappropriate order.
It might cause fire or failure.

Do not connect the ground (E) to the servomotor side U, V, or W terminals, or connect the U, V, or
W terminals in the wrong order.
It may cause a fire or failure. Furthermore, there is a risk of damage to the customer's machine if
the motor malfunctions.

Always ensure that motor power cables are not connected incorrectly. If there is a motor power
cable wiring (U, V, W) phase interruption, the motor may not rotate, and an alarm (OL, OS, etc.)
may be detected even if a command is input.

Never perform a dielectric, Megger or buzzer test to the encoder terminals.
Otherwise the encoder will be damaged.

To perform a dielectric, Megger or buzzer test to the U, V and W terminals of the servomotor,
disconnect the servo amplifier.

Do not connect encoder terminals in inappropriate order.
Otherwise the encoder and servo amplifier will be damaged.

In an adverse power supply environment, insert a protective device such as the AC reactor so that
the voltage fluctuation is contained within the rating.
Otherwise the servo amplifier will be damaged.

Install a circuit breaker or similar safety devices for short circuits in external wiring.
There is a risk of fire or failure.

Do not remove the cover or disconnect the cable, connector or optional device with the servo
amplifier turned on.
There is a risk of electric shock to human body, product operation stop, and burnout.

Use the servo system under the specified voltage range.

Do not tie signal cables or route them in the same duct with main power cable or servo amplifier
motor output cable.

Use the designated wiring material. In particular, use the option cable or equivalent for the encoder
cable.

Do not insert a phase advance capacitor, various filter, reactor or similar on the output side of the
servo amplifier.
 The servo amplifier cannot be fully protected from ground fault.
Ground

Be sure to connect the grounding terminal of the servo amplifier to a grounding electrode.
There is a risk of electric shock.