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15. SERVO AMPLIFIERS WITH A LARGE CAPACITY
(
30k TO 55kW
)
15.8.2 Power supply equipment capacity and generated loss
POINT
The calculation method of heat dissipation area for enclosed control panel is the
same as that for servo amplifiers with 22kW or less. Refer to section 11.2 (2).
Table 15.1 indicates the generated loss and power supply capacity under rated load per combination of the
converter unit and drive unit. When the servo motors is run at less than the maximum speed, the power supply
equipment capacity is lower than the value in the table but the heat generated does not change.
Since the servo motor requires 2 to 2.5 times greater instantaneous power for acceleration, use the power
supply which ensures that the voltage lies within the permissible voltage fluctuation at the main circuit power
supply terminals (L
1, L2, L3) of the converter unit. The power supply equipment capacity changes with the
power supply impedance.
The actually generated heat falls within the ranges at rated torque and at zero torque according to the
frequencies of use during operation. When designing an enclosed control box, use the values in the table,
considering the worst operating conditions. The generated heat in Table 15.1 does not include heat produced
during regeneration.
Table 15.1 Power supply capacity and generated heat per servo amplifier at rated output
Converter unit Drive unit Servo motor
Power supply
capacity [kVA]
(Note)
Drive unit-generated heart[W]
Area required
for heat
dissipation
[m
2
]
Power factor
improving DC
reactor is not
used
Power factor
improving DC
reactor is used
At rated torque At zero torque
MR-J3-CR55K
MR-J3-DU30KA
HA-LP30K1
HA-LP30K1M
HA-LP30K2
48 40 1550(1100
450) 31.0
MR-J3-DU37KA
HA-LP37K1
HA-LP37K1M
HA-LP37K2
59 49 1830(1280 550) 36.6
MR-J3-CR55K4
MR-J3-
DU30KA4
HA-LP25K14 40 35 1080(850
230) 21.6
HA-LP30K14
HA-LP30K1M4
HA-LP30K24
48 40 1290(1010
280) 60 (30 30) 25.8
MR-J3-
DU37KA4
HA-LP37K14
HA-LP37K1M4
HA-LP37K24
59 49 1542(1200
342) 30.8
MR-J3-
DU45KA4
HA-LP45K1M4
HA-LP45K24
71 59 1810(1370
440) 36.2
MR-J3-
DU55KA4
HA-LP50K1M4 80 67 2120(1650
470) 42.4
HA-LP55K24 87 72 2150(1650 500) 43.0
Note. The heat generated by the drive unit is indicated in the left term within the parentheses, and the heat generated by the converter
unit in the right term.