NSK EDD Megatorque Motor, User Manual, Page: 19 / 398

1. Introduction
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Caution : Use of an optional regeneration resistor shall be considered for a heavy-
duty operation.
• The Megatorque Motors regenerate when they decelerate carrying heavy load
inertia.
• An internal capacitor charges the Motor regeneration. However, when high and
continuous regeneration exceeding its capacity is applied, excess energy activates an
alarm “Alarm P1: Abnormal main power voltage” and the Motor stops. In such a
case, you need to lower operating conditions (velocity, deceleration rate, and
operation duty cycle), or you require an external high capacity regeneration resistor.
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Danger : Never apply water or oil to the Driver Unit.
• Take appropriate measures to protect the Driver Unit from water, oil, slag, dust, and
corrosive gas.
Figure 1-1: Outline of Driver Unit Model EDD
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Warning : Do not test the insulation of the Driver Unit.
• The high voltage used in the test may destroy the internal circuits of Driver Unit.
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Caution : In most cases, the Direct Drive Motor System cannot exhibit its full
performance unless the shipping set of the parameters is altered for
actual applications.
• Refer to “5. Tuning” and be sure to set the servo parameters to actual use conditions.
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Caution : Allowable moment load and axial load depend on Motor size. Please
confirm that actual load conditions are in the limits of the Motor.
• Refer to “2.5. Motor Specifications” for the allowable moment load, axial load and
radial load.
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Caution : An excessive eccentric load or an excessive load may cause the
permanent deformation of the rotor or premature failure of the bearing
inside the Motor. When handling the Motor, please pay special attention
not to drop it and not to give a shock to it. Protect the Motor from a
collision with an obstacle.