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Appendix 5: Regeneration Dump Resistor
l The Megatorque Motor will function as a generator in the following conditions. This
phenomenon is called regeneration.
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
overflowed energy.
l However if the regeneration occurs frequently, the dump register will be overheated due to its
limited capacity and eventually, the over-heat alarm will be on, and the Motor will stop.
* Capacity of the dump resistor is approximately 2.5W.
l When an over-heat alarm occurs, take the following remedies.
If above measures are not feasible, an external high capacity regenerative dump resistor may be
applied without compromising the use conditions of the Megatorque Motor.
1. Criterion to use the regeneration dump resistor
l In normal positioning, the best combination of acceleration and maximum velocity exists for
applied load and indexing angle. If the use condition exceeds this criterion, it requires the
external dump resistor.
Figure A-23
0
à When the Motor is decelerating under heavy load inertia.
à When decelerating speed of the Motor is affected by the gravity.
(Example: An unbalanced load is attached to a jig, etc.)
à Reduce the duty cycle.
à Decrease acceleration and deceleration.
à Decrease operation speed.
Acceleration*
Maximum velocity*
Time
à * Recommended combination of acceleration and maximum velocity to realize the
shortest operation time without overshooting.
Appendix 5: Regeneration Dump Resistor
Indexing angle
— A-21 —
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