Selection; Selection Of The Power Supply Unit - Mitsubishi Electric MDS-EX-CVP Series Technical Specification And Instruction Manual

MDS-EX-CVP Series Specifications and Instruction Manual

7. Selection

7. Selection
Calculate both the spindle motor output and the servo motor output, and check that the required rated capacity and the
maximum momentary output are less than the specifications of the power supply unit.

7.1 Selection of the Power Supply Unit

(1) Calculation of required continuous rated output
Power supply unit rated output > Σ (Spindle motor continuous rated output) + 0.3 Σ (Servo motor rated
output)
Calculate the total sum of "the spindle motor continuous rated output" and "servo motor rated output" with the above
expression.
(2) Calculation of required 30-minute rated output
Power supply unit 30-minute rated output > Σ (MAX(spindle motor short time rated output and output
during acceleration/deceleration + 0.3 Σ (servo motor rated output)
Calculate the total sum of the "spindle motor short time rated output and output during acceleration/deceleration" and
the "servo motor rated output" with the above expression.
(3) Calculation of required maximum momentary output
Maximum momentary rated capacity of power supply unit ≥
Σ (Spindle maximum momentary output) + Σ (Maximum momentary output of servo motor accelerating/
decelerating simultaneously)
Calculate the total sum of the "spindle maximum momentary output" and "output of servo motor accelerating/decelerating
simultaneously" with the above expression.
(4) Selection of power supply unit
Select the power supply unit of which the rated capacity and maximum momentary rated capacity are larger than those
selected in the item (1), (2), and (3). When the capacity is smaller than the item (1), (2), and (3), add the power supply
unit.
Table: Power supply unit rated capacity and maximum momentary rated capacity
CAUTION
1. When reducing the time constant replacing the conventional motor with the HG or HG-H Series motor, the power
supply capacity may rise because the motor maximum momentary output increases more than the conventional
motor. Therefore, make sure to check the selection with maximum momentary rated capacity.
2. When the large capacity drive unit (MDS-E-SP-400/640, MDS-EH-SP-200/320/480/600, MDS-EH-V1-200) is
connected to the power supply unit, always install the drive unit proximally in the left side of the power supply unit
and connect PN terminal with the dedicated DC connection bar.
3. When using two large capacity drive units or more, the power supply unit is required for each drive unit.
Refer to the latest version of "MDS-E/EH Series Specifications Manual" (IB-1501226(ENG)) for
calculation method of the spindle motor output and the servo motor output.
IB-1501587-A
Unit MDS-EX-CVP
Continuous rated output [kW]
30-minute rated output
Maximum momentary rated
capacity [kW]
28
1100H
90
110
220