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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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