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15. SERVO AMPLIFIERS WITH A LARGE CAPACITY
(
30k TO 55kW
)
15.8.4 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.
Converter unit Drive unit
Inrush currents (A
0-P)
Main circuit power supply (L
1
, L
2
, L
3
) Control circuit power supply (L
11
, L
21
)
MR-J3-CR55K
MR-J3-DU30KA
163A
(Attenuated to approx. 20A in 180ms)
18A
(Attenuated to approx. 0A in 100ms)
MR-J3-DU37KA
MR-J3-DU30KA4
339A
(Attenuated to approx. 20A in 70ms)
19A
(Attenuated to approx. 0A in 60ms)
MR-J3-CR55K4
MR-J3-DU37KA4
MR-J3-DU45KA4
MR-J3-DU55KA4
Since large inrush currents flow in the power supplies, make sure to use no-fuse breakers and magnetic
contactors. (Refer to section 15.9.5.)
When circuit protectors are used, it is recommended to use the inertia delay type that will not be tripped by an
inrush current.
15.9 Options
WARNING
Before connecting any option or peripheral equipment, turn off the power and wait
for 20 minutes or longer until the charge lamp turns off. Then, confirm that the
voltage between L
and L is safe with a voltage tester and others. Otherwise,
an electric shock may occur. In addition, make sure to confirm from the front of the
converter unit whether the charge lamp is off or not.
CAUTION
Use the specified auxiliary equipment and options. Unspecified ones may lead to a
fault or fire.
POINT
Explanations on the following item are the same as those for servo amplifiers with
22kW or less. Refer to the section below for details.
Cable/connector sets Refer to section 12.1.
Junction terminal block Refer to section 12.7.
MR Configurator Refer to section 12.8.
Battery Refer to section 12.9.
Relays Refer to section 12.15.
Surge absorbers Refer to section 12.16.
Radio noise filter (FR-BIF-(H)) Refer to section 12.17 (2) (e).
15.9.1 Cables and connectors
POINT
Other connectors are the same as those for servo amplifiers with 22kW or less.
Refer to section 12.1.