9. SPECIFICATIONS
9－9
9.1.4 Precautions on Load
(1) Negative load
The Servo Amplifier cannot perform such negative load operation as causes the motor to rotate
continuously.
(Examples)
• Downward motor drive (when no counterweight is provided).
• Use like a generator, for example, the wind-out spindle of a winder.
When applying the amplifier to a negative load, consult us.
(2) Load inertia (J
L
)
When the Servo Amplifier is used with a load inertia exceeding the allowable load inertia calculated in
terms of the motor shaft, a main circuit power overvoltage detection or regenerative error function may
be activated at the time of deceleration.
In this case, the following measures must be taken.
① Lower the current limit.
② Make the acceleration/deceleration time longer (slow down).
③ Reduce the maximum motor speed to be used.
④ Install an external regenerative resistor (optional).
For details, ask us for information.
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