Instruction manual

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5. OPERATION AND FUNCTIONS
5.6.2 Auto tuning function
The auto tuning function during the linear servo operation is the same as that of normal servo, but the
calculation method of load inertia moment ratio (J ratio) is different. The load inertia moment ratio (J ratio) on
the linear servo is a mass ratio calculated dividing the load mass by the mass of linear servo motor primary
side (coil).
Example) Linear servo motor primary side (coil) mass = 2kg
Load mass (excluding the motor primary side (coil) mass) = 4kg
Mass ratio (J ratio) = 4/2 = Twice
Other parameters set with the auto tuning function are the same as those of MR-J2-
B servo amplifier. For
details, refer to Chapter 6 of the MR-J3-
B Servo Amplifier Instruction Manual.
POINT
If not meeting with the following conditions, the auto tuning mode 1 may not
operate properly.
The acceleration/deceleration time constant which takes less than 5s to reach to
2,000mm/s
The linear servo motor speed is 150mm/s or faster.
The load mass ratio to the mass of linear servo motor primary side (coil) is 100
times or smaller.
The acceleration/deceleration thrust is 10% or less of the rated thrust.
5.6.3 Machine analyzer function
The machine analyzer function of MR Configurator is the same as that of MR-J3-
B.
POINT
Make sure to carry out the machine analyzer function after the magnetic pole
detection. If the magnetic pole detection is not executed, the function may not
operate properly.
The stop position at the completion of machine analyzer can be any position.
5.7 Absolute position detection system
When using the linear servo motor for the absolute position detection system, the absolute position linear
encoder is required. The backup of absolute value data is performed by the linear encoder. For this reason,
there is no need to mount a battery (MR-J3BAT) for encoder on the servo amplifier. Also, the alarm (25) and
warnings (92, 9F and E3) related to the absolute position are not detected.