
2.MECHANICAL DESIGN HANDLING, DESIGN, AND ASSEMBLY B-65332EN/01
2.1.4 Mounting Position of Dis series Motor and Encoder
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To match the magnetic pole position of motor to the encoder, the
positional relationship between the motor and the encoder is
predetermined, where the motor and the encoder are on their reference
points at the same time, as shown below.
It is not necessary to consider the mounting angle of encoder, as long
as the motor and the encoder are on their reference points at the same
time.
CAUTION
1 Before mounting a rotary encoder, check that the
positive direction of the Dis series motor matches
the positive direction of the rotary encoder. If a
positive direction mismatch exists, the motor can
become uncontrollable in the worst case.
2 If a rotary encoder is mounted at an incorrect
position, the power factor can drop, and a soft
thermal (OVC) alarm can be issued. In addition, the
motor can become uncontrollable in the worst
case. Before turning on the power to the machine
after machine assembly, recheck the positional
If a rotary encoder is mounted at an incorrect
relationships.
3 It is not necessary to match the reference point of
motor and encoder by using “Pole Position
Detection Function”. For an incremental encoder
system, “Pole Position Detection Function” is
necessary. For an absolute encoder system, it is
not necessary to use it as long as the motor and
the encoder were mounted on the specified
position. However, using this function can absorb
the mechanical tolerance of mounting position
electrically and automatically. For details of “Pole
Position Detection Function”, refer to FANUC AC
SERVO MOTOR αis/αi series Parameter Manual.