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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
Use the dynamic brake at the load inertia moment indicated in the following table. If the load inertia moment is
higher than this value, the built-in dynamic brake may burn. If there is a possibility that the load inertia moment
may exceed the value, contact Mitsubishi.
Drive unit
Load inertia moment ratio
[times]
MR-J3-DU30KB(4)
MR-J3-DU37KB(4)
MR-J3-DU45KB4
10
MR-J3-DU55KB4
13.8.4 Inrush currents at power-on of main circuit and control circuit
The following table indicates the inrush currents (reference data) that will flow when the maximum permissible
voltage (200V class: 253VAC, 400V class: 528VAC) is applied at the power supply capacity of 2500kVA and
the wiring length of 1m.
Inrush currents (A
0
-p)
Converter unit
Drive unit
Main circuit power supply (L
1
, L
2
, L
3
)
Control circuit power supply (L
11
, L
21
)
MR-J3-DU30KB
MR-J3-CR55K
MR-J3-DU37KB
163A
(Attenuated to approx. 20A in 180ms)
18A
(Attenuated to approx. 0A in 100ms)
MR-J3-DU30KB4
MR-J3-DU37KB4
MR-J3-CR55K4
MR-J3-DU45KB4
MR-J3-DU55KB4
339A
(Attenuated to approx. 20A in 70ms)
19A
(Attenuated to approx. 0A in 60ms)
Since large inrush currents flow in the power supplies, always use no-fuse breakers and magnetic contactors.
(Refer to section 13.9.5.)
When circuit protectors are used, it is recommended to use the inertia delay type that will not be tripped by an
inrush current.
Содержание Melservo MR-J3- 350B4
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