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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
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 (A0-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.
13.9 Options
WARNING
Before connecting any option or peripheral equipment, turn off the power and wait
for 20 minutes or more 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, always 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 11.1.
Junction terminal block Refer to section 11.7.
MR Configurator Refer to section 11.8.
Battery Refer to section 11.9.
Relays Refer to section 11.15.
Surge absorbers Refer to section 11.16.
Radio noise filter (FR-BIF(-H)) Refer to section 11.17 (2) (e).
13.9.1 Cables and connectors
POINT
Other connectors are the same as those for servo amplifiers with 22kW or
less. Refer to section 11.1.