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Chapter 9 Setup
9–14
<Adjustment methods>
1. Secure the distance (PIT) that the linear motor could move during DC
excitation as shown on the right.
2. Set SV034/dcd to "1", and the setting values for starting DC
excitation in SV061 to SV063.
3. Release the emergency stop. (DC excitation start)
4. Apply the emergency stop. (DC excitation end)
<Operation>
1. When the emergency stop is released, the current set in SV061 will flow to the V phase (V phase
excitation) for (SV063 setting value × 1/2) msec, and the motor will move toward the pole 120°. At
this time, the direction and distance that the linear motor position will move when the emergency
stop is released will differ as shown below.
(It may not be possible to confirm movement when already near pole 120°.)
2. Next, the current set in SV061 will flow the U phase (U phase excitation) for (SV063 setting value
x 1/2) msec, and the motor will move toward the pole 0°. In this case, the movement will be in the
same direction for all examples shown below.
3. Finally, the current set in SV062 will flow to the U phase, and the pole 0° position will be
established.
<Confirmation>
1. During DC excitation, confirm the value displayed at MAX CURRENT 2 value on the CNC Servo
Monitor screen.
If the linear motor does not move even when the MAX CURRENT 2 value is 100 or more, the
cable connection may be incorrect, so confirm the connection.
2. Confirm the MAIN side feedback polarity (SPEC/fdir) achieved with DC excitation.
The MAIN side feedback polarity can be confirmed with the direction that the linear motor moves
during U phase excitation, and the increment/decrement of the cycle counter displayed on the
CNC Servo Monitor screen. Judge whether the polarity confirmed with DC excitation matches the
polarity set with the servo parameters. Correct the servo parameter polarity if incorrect.
fdir correction table according to linear motor movement with DC excitation.
Linear motor
movement
Linear motor polarity
Minus direction
Linear motor polarity
Plus direction
Cycle counter
increment/decrement
Increment Decrement Increment Decrement
ABS SCALL Correctly set Incorrectly set Incorrectly set Correctly set
MDS-B-HR Incorrectly set Correctly set Correctly set Incorrectly set
Movement
distance within
PIT setting value
Motor
Magnet
Movement
distance within
PIT setting value
V phase
excitation
U phase
excitation
Pole 120°
Pole 0°
Pole 300°
Motor
Magnet
V phase
excitation
U phase
excitation
Pole 120°
Pole 0°
Motor
Magnet
V phase
excitation
U phase
excitation
Pole 360°
(Pole 0°)
Pole 300°
Pole 120°
Motor
Magnet
Fig. 9.3.3 When linear motor is
between pole 0°
and 120°
Fig. 9.3.4 When linear motor is
between pole 300°
and 360°
Fig. 9.3.5 When linear motor is
between pole 120°
and 300°