2-5
Line Disconnection, Reverse Wiring, or Out-of-control Errors Occur
• The Position Control Unit with analog output will be out of control if the polarity of the speed command
does not coincide with that of the encoder signal.
• If the Position Control Unit cannot recognize the encoder signal correctly, a motor runaway will result or
the motor will rotate slowly.
Probable cause Item to check Countermeasure
Encoder A and B phase lines are
connected opposite to each other.
• Opposite wiring is detected.
• A motor runaway results during
servo-lock.
• Connect the lines correctly.
Encoder phase lines are
disconnected or the encoder I/O
terminal is damaged.
• Line disconnection is detected.
• The motor rotates slowly during
servo-lock.
• A motor runaway results during
positioning.
• The encoder signal does not turn
ON or OFF. (The encoder signal
output terminal is damaged.)
• The deviation counter does not
work even though the encoder
signal continues turning ON and
OFF. (The encoder signal input
terminal is damaged.)
• Correct the cable wiring.
• Replace the cable.
• Replace the Servo Driver.
• Replace the Position Control
Unit.
The speed command signal is
disconnected or the speed
command input terminal is
damaged.
• Line disconnection is detected.
• The motor in positioning opera-
tion rotates slowly without posi-
tioning.
• The speed command voltage on
the Position Control Unit output
terminal does not change. (The
speed command output terminal
is damaged.)
• The motor does not rotate with
changes in the speed command
on the Servo Driver input termi-
nal. (The speed command input
terminal is damaged.)
• Correct the cable wiring.
• Replace the cable.
• Replace the Position Control
Unit.
• Replace the Servo Driver.
Connection to Position Control Unit Chapter 2
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