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MDS-D/DH Series Specifications Manual
7-3 Selection of the power supply unit
7-3-4 Required capacity of power supply
For the power supply capacity, calculate the required spindle rated output and servo motor rated output
each, and select the power supply capacity satisfying them.
(1) Spindle rate output required for power supply
The spindle rate output required for power supply is calculated from the following expression.
Spindle rate output required for power supply =
MAX (Spindle motor continuous rated output, Spindle motor output at accelerating/decelerating,
Spindle motor short-time output) x motor output coefficient β of combined spindle drive unit
(Note) For the spindle rate output required for the power supply, multiply the largest one of "spindle motor
continuous rate output", "spindle motor output at acceleration/deceleration" and "spindle motor short-
time output" by the motor output coefficient β of the combined spindle drive unit.
For the motor output coefficient of the combined spindle drive unit, use the value corresponding to the
used spindle drive unit in the table 2. of 7-2-1 (1).
(2) Servo motor rate output required for power supply
For the servo motor rate output required for power supply, use the value calculated in 7-2-2 (1).
(3) Calculation of rate output required for power supply
(a) When there is only one servomotor axis
Rated capacity required for power supply =
Σ(Spindle rate output required for power supply) + (servo motor rate output required for
power supply)
(b) When there are two or more servomotor axes
Rated capacity required for power supply =
Σ (Spindle rate output required for power supply) + 0.7 Σ (servo motor rate output required
for power supply)
Substitute the output calculated from the item (1) and (2) to the expression (a) and (b), and calculate the
rated capacity required for the power supply.
(4) Calculation of required power supply
Power supply capacity (kVA) = Σ{(Required rated capacity calculated in the item (3)(kW) /
Capacity of selected power supply unit (kW)) x Power supply capacity base value (kVA)}
The power supply capacity base value corresponding to the capacity of the selected power supply unit is as
the following table.
< MDS-D Series >
< MDS-DH Series >
Unit MDS-D-CV- 37 75 110 185 300 370 450 550
Power supply capacity base value (kVA) 5.3 11.0 16.0 27.0 43.0 53.0 64.0 78.0
Unit MDS-DH-CV- 37 75 110 185 300 370 450 550 750
Power supply capacity base value (kVA) 5.3 11.0 16.0 27.0 43.0 53.0 64.0 78.0 107.0