DA98A AC Servo Drive Unit
User Manual
55
Load inertia multiplier Allowable on-off frequency
m≤3
＞100 times/min: acceleration/deceleration time
60ms or less
m≤5
60 ～ 100 times/min: acceleration/deceleration
time 150ms or less
m＞5
＜ 60 times/min: acceleration/deceleration time
150ms above
（2） Effect of the servo motor
The allowable on-off frequency and acceleration/deceleration time constant of different
model servo motor varies with factors of load, running time, occupation, ambient
temperature. Please adjust them by the actual situation referring to motor manual to protect
the motor life against overheating or alarm.
（3） Adjustment
Usually the load inertia should be within five folds of the motor rotor inertia. If it is used in
large load inertia, main circuit overvoltage or brake abnormality in deceleration may occur
frequently, and it can be resolved by follows:
z Increase acceleration/deceleration time (parameter No.40, No.41).
z Reduce the internal torque limit (parameter No.34, No.35).
z Reduce the max. motor speed (parameter No.23).
z Fix an additional regenerative brake device.
z Change the motor by a larger one on power and inertia.
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