Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 348 / 500

14. USING A DIRECT DRIVE MOTOR
14 - 15
(a) Incremental system
For the incremental system, the magnetic pole detection is required every time the power is turned on.
By turning on the servo-on command from the controller after the power-on, the magnetic pole detection
is automatically carried out. Therefore, you do not need to set the parameter (first digit of parameter
No.PS01) for executing the magnetic pole detection.
1) Timing chart
ON
OFF
ON
OFF
ON
OFF
95ms
Servo-on command
Base circuit
Ready (RD)
15s or less
Magnetic pole detection time (Note)
Note. The magnetic pole detection time indicates the operation time when the stroke limits
(FLS and RLS) are on.
2) Direct drive motor movement (when FLS and RLS are on)
Magnetic pole detection complete position
Servo-on position (Magnetic pole detection start position)
Center of direct drive motor rotation part
FLS (Note) (Note) RLS
10deg or less
Note. When the stroke limit (FLS or RLS) turns off during the magnetic pole detection, the
magnetic pole detection is carried on to the opposite direction. When both FLS and RLS
are off, Initial magnetic pole detection error (27) will occur.
3) Direct drive motor movement (when FLS or RLS is off)
When FLS or RLS is off at servo-on, the magnetic pole detection is carried out as follows.
Magnetic pole detection complete position
After the machine moves to the position where the stroke
limit (FLS and RLS) is set, the magnetic pole detection
starts.
Center of direct drive motor rotation part
10deg or less
Magnetic pole detection
start position
Servo-on position
FLS
RLS