Instruction manual
Appendix 4. Explanation of Large Capacity Spindle Unit Specifications
A4 - 9
Appendix 4-1-6 Heating value
Power supply unit Spindle drive unit
Type Heating value (W) Type Heating value (W)
MDS-B-CVE-450 500 MDS-B-SPA-370 850
MDS-B-CVE-550 600 MDS-B-SPA-450 1000
MDS-B-SPA-550 1200
(Note 1) The heating value is the value at the continuous rated output.
(Note 2) Use the following expressions as a guide for the heating value outside the panel when
mounting in an enclosed structure.
Unit Heating value outside panel
MDS-B-CVE-450, 550
Heating value outside panel =
(B-CVE heating value -30) × 0.75
MDS-B-SPA-370, 450, 550
Heating value outside panel =
(B-SPA heating value -40) × 0.75
Appendix 4-1-7 Selecting the power capacity
The power capacity required for the power supply unit is shown below.
Power supply unit type Power capacity (kVA)
MDS-B-CVE-450 63
MDS-B-CVE-550 77
Appendix 4-1-8 Selecting the wire size
(1) Recommended wire size for power lead-in wire
Regardless of the motor type, select the wire size as shown below using the power supply unit
capacity as a reference.
Power supply unit type
Recommended wire size for
power-lead-in wire
MDS-B-CVE-450 HIV60mm
2
MDS-B-CVE-550 HIV80mm
2
(2) Recommended wire size for spindle motor output wire
Regardless of the motor type, select the wire size as shown below using the spindle drive unit
capacity as a reference.
Spindle drive unit type
Recommended wire size for spindle
motor output wire
MDS-B-SPA-370 HIV50mm
2
MDS-B-SPA-450 HIV60mm
2
MDS-B-SPA-550 HIV80mm
2
(3) L+, L– link bar wire size
Power supply unit type L+, L– link bar wire size
MDS-B-CVE-450 Dedicated link bars are enclosed as accessories (always use accessories)
MDS-B-CVE-550 Dedicated link bars are enclosed as accessories (always use accessories)
(Note) The wire sizes above for the MDS-B-CVE-450/550 are the values when connecting to the
terminal section on the left front.
(4) L11, L21, MC1
Regardless of the spindle drive unit and power supply unit capacities, use an IV2mm
2
or more wire
size.