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Chapter 3 Selection
3–6
3-2 Selecting the power supply unit
Compared to the normal rotary motor, when using the linear servo system, the instantaneous output,
such as the acceleration/deceleration, is large in respect to the continuous operation. Furthermore,
this system is used in applications where acceleration/deceleration is carried out frequently, so the
selection differs from the methods for selecting the conventional power supply unit.
Power supply unit capacity > Σ (Spindle motor output)
+Σ (Capacity of servo amplifier
driving linear motor)
+0.7 × Σ (Rotary servomotor output) (3-5)
* When using two or more axes with the rotation motor
Select a power supply unit capacity having the minimum lineup capacity that satisfies expression
(3-5).
(Caution) With the linear servo axis, this is used for an axis with a high acceleration/deceleration
frequency compared to that multiplied by 0.7 when using two or more axes with the
rotation motor, so the value does not need to be multiplied by 0.7.
POINT
Refer to the "MELDAS AC Servo and Spindle MDS-A Series, MDS-B Series
Specifications BNP-B3759B" for other details on the power supply unit.
3-3 Selecting the power supply capacity, wire size, AC reactor, contactor and
NFB
POINT
The selection of the power supply capacity, wire size, AC reactor, contactor
and NFB is the same as the MDS-B-V1 unit.
Refer to the "MELDAS AC Servo and Spindle MDS-A Series, MDS-B Series
Specifications BNP-B3759B".