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12. OPTIONS AND AUXILIARY EQUIPMENT

WARNING

Before connecting any option or auxiliary equipment, make sure that the charge

lamp is off more than 15 minutes after power-off, then confirm the voltage with a
tester or the like. Otherwise, you may get an electric shock.

CAUTION

Use the specified auxiliary equipment and options. Unspecified ones may lead to a

fault or fire.

12.1 Options

12.1.1 Regenerative brake options

CAUTION

The specified combinations of regenerative brake options and base units may only

be used. Otherwise, a fire may occur.

(1) Combinations and regenerative powers
The power values in the table are resistor-generated regenerative powers and not rated powers.

Regenerative power [W]

Base unit

MR-RB032

[40 ]

MR-RB14

[26 ]

MR-RB34

[26 ]

MR-RB54

[26 ]

MR-J2M-BU4
MR-J2M-BU6
MR-J2M-BU8

100

300

500

(2) Selection of regenerative brake option

(a) Simple judgment of regenerative brake option necessity

The MELSERVO-J2M series does not contain a regenerative brake resistor. Check whether the
regenerative brake option is needed or not in the following method.

1) Requirements

The drive units mounted to the same base unit are all horizontal axes.
The operation pattern is clear and the load inertia moments of the axes to be decelerated
simultaneously are clear.

2) Checking method

The following table gives the permissible load inertia moment that does not require the
regenerative brake option when speed is reduced from 3000r/min.

Drive unit

Permissible Load Inertia Moment

MR-J2M-10DU
MR-J2M-20DU
MR-J2M-40DU

1.42kg cm

MR-J2M-70DU

4.94kg cm

Calculate the 3000r/min-equivalent inertia moment of each drive unit.

(Load inertia moment equivalent for 3000r/min) (J

) (running speed/3000)