4.4 PRECAUTIONS FOR APPLICATION
4.4.1 Overhanging Load 9
The motor is rotated by the load; Additional regenerative resistor may be required
against this rotation and achieve continuous running.
Example: Vertical axis without counterweight
Since Servopack has the regenerative brake capability of short time (corresponding
to the motor stopping time), for application to a minus load, contact your Yaskawa
representative.
4.4.2 Load In e_ia (JL)
The allowable load inertia JL converted to the motor shaft must be within five times
(M, F, G, D, S, P series) or ten times (R series) the inertia of the applicable AC
servomoter. If the allowable inertia is exceeded,an overvottage alarm maybe given
during deceleration. If this occurs, take the following actions:
• Reduce the current limit.
• Slowdownthe deceleration curve.
• Decreasethe maximumspeed.
For details, contact your Yaskawarepresentative. 9
4.4.3 Allowable Cyclic Operating Frequency
Start/Stop cyclic operating frequency is limited separately by Servopackand
Servomotor. it is necessary to satisfy both conditions.
(1) Allowable cyclic operating frequency limited by Servopack.
Servopack limitation is due to Servopack built-in regenerative resistor generating dl
power. Allowable frequency differs depending on combined motor types, capacities,
load inertia
J¢,, accel/decel current values and motor speed.
For the following cases, contact your Yaskawa representative.
• Whenstart/stop cyclic operating frequency up to rated speed exceeds 60 times/min at
loadinertiaJL= O. 60
• Whenstart/stop cyclic operating frequency up to rated speed sxceeds m+----_times/min
at load inertia JL = motor inertia JM × m times.
(2) Allowable cyclic operating frequency limited bY Servomotor
WhenAC Servomotor rms torque in an operation cycle is within the continuous duty zone
of motor performance (Par. 3.1),the operation can be repeated in the operation cycle. ,_s
II
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