— A-18 —
Appendix 5 : Regeneration Dump Resistor
l Megatorque Motor will function as a generator in the following conditions. This phenomenon is
called regeneration.
◊ When decelerating under heavy inertia.
◊ When the Motor axis is horizontal, weight of an unbalanced load attached to the rotor
gives torque load to the Motor.
l Energy generated by the motor will be charged to the main power circuit condenser. If energy is
more than the capacity of the condenser, a dump resistor of the Driver Unit will dissipate overflown
energy.
l However, when the regeneration occurs frequently, the dump register will be overheated due to its
limited capacity. Eventually over-heat alarm will be on and Motor will stop.
* Dump resistor capacity is about 2.5W.
l When an over-heat alarm is detected, following remedies should be taken.
◊ Reduce duty cycle
◊ Decrease acceleration/deceleration.
◊ Lower operation speed.
l If above measures are not feasible, an optional high capacity regenerative dump register is available
from NSK. It will dissipate regeneration energy without loosing speed of Megatorque Motor.
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