— A-18 —
Appendix 5: Dump 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 dump resistor
with high durability may be used without downgrading the performance of the Megatorque
Motor System.
◊ An optional dump resistor [M-E014DCKR1-100] is available from NSK Ltd.
Procedures to install the external dump resistor
1) Confirm that the Motor cable is connected as shown in Figure A-13 below.
Fig A-13: Shipping set of the Motor cable connection
Wire of øU (red)
Wire of øV (white)
Wire of øW (black)
Shorting wire of
thermo sensor
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