Appendix
— A-22 —
Appendix 6: Regeneration Resistor
A Megatorque Motor works as a generator in the following cases. This is called regeneration.
(1) When the Motor is decelerating with a heavy inertial load.
(2) When the axis of the Motor is horizontal and an unbalanced load is giving a torque load,
which is induced by the gravity, to the Motor.
The energy resulted from the regeneration (regenerative energy) will be charged to the capacitor provided
to the main power circuit of the Driver Unit. However, if the regenerative energy exceeds the capacity of
the capacitor, which is 28 J at 200 [VAC], the Motor will be stopped by the alarm P1 (Main Power Over
Voltage).
In such a case, the following measures shall be taken.
Decrease acceleration and deceleration.
Decrease velocity.
Decrease the load moment of inertia.
If you do not want to downgrade the operational conditions, an optional external regeneration resistor with
high durability may be used without downgrading the performance of the Megatorque Motor System.
An optional regeneration resistor such as [M-E014DCKR1-100] is available from NSK Ltd.
Procedures to install the external regeneration resistor
1) Confirm that the Motor cable is connected as shown in Figure A-22 below.
Fig A-20: Shipping set of the Motor cable connection
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