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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
13.8.2 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 10.2
(2).
Table 13.1 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
, L
2
, L
3
) 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 13.1 does not include heat produced
during regeneration.
Table 13.1 Power supply capacity and generated heat per servo amplifier at rated output
Power supply
capacity [kVA]
(Note)
Drive unit-generated heart[W]
Converter unit Drive unit Servo motor
Power factor
improving DC
reactor is not
used
Power factor
improving DC
reactor is used
At rated torque At zero torque
Area required
for heat
dissipation
[m
2
]
MR-J3-DU30KB
HA-LP30K1
HA-LP30K1M
HA-LP30K2
48 40 1550(1100+450) 31.0
MR-J3-CR55K
MR-J3-DU37KB
HA-LP37K1
HA-LP37K1M
HA-LP37K2
59 49 1830(1280+550) 36.6
HA-LP25K14 40 35 1080(850+230) 21.6
MR-J3-
DU30KB4
HA-LP30K14
HA-LP30K1M4
HA-LP30K24
48 40 1290(1010+280) 60(30+30) 25.8
MR-J3-
DU37KB4
HA-LP37K14
HA-LP37K1M4
HA-LP37K24
59 49 1542(1200+342) 30.8
MR-J3-
DU45KB4
HA-LP45K1M4
HA-LP45K24
71 59 1810(1370+440) 36.2
HA-LP50K1M4 80 67 2120(1650+470) 42.4
MR-J3-CR55K4
MR-J3-
DU55KB4
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.