Precautions; Overhanging Load; Load Inertia J L; Regenerative Resistor Unit - YASKAWA SGM Series User Manual

Application

5.6.3 Regenerative Resistor Unit

5.6 Precautions

5.6.1 Overhanging Load

5.6.2 Load Inertia J
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5.6.3 Regenerative Resistor Unit
Do not allow the motor to be continuously rotated by the load while the regenerative brake is
being applied.
Example: Tension control drive
Do not use the motor for lowering objects without a counterweight.
Rated specifications for the regenerative braking capacity of the SERVOPACK is only for brief
periods while the motor is stopped. Contact your Yaskawa representative about applications with
negative load.
L
The allowable load inertia J
L
the motor inertia (J ). If the load inertia exceeds this value, an overvoltage alarm may occur dur-
M
ing deceleration. If this occurs, take one of the following actions. Contact our sales representative
for further details.
D Reduce the torque limit.
D Reduce the deceleration rate.
D Reduce the maximum rotation speed.
A regenerative resistor unit is used as an SGDB SERVOPACK peripheral device with 6.0 kW
or higher capacity. Externally connect a Regenerative resistor unit to 6.0 kW or higher capacity
SERVOPACKS because they do not have built-in regenerative resistors.
calculated for the motor shaft is limited to less than five times of
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