Application and Operation
6.7 Drive Output Torque Limiting
Product User Manual
124 Operating Instructions, Version AE 12/2009, A5E01454341C
6.7 Drive Output Torque Limiting
The drive uses measured voltages and currents to implement torque-limit (rollback)
conditions. Under one or more of these conditions, the drive will continue to operate, but at a
lower output torque (or current) level. An output torque limit will force the motor (and the
drive) to go into speed rollback, during which speed is reduced until the torque demanded by
the load falls below the torque limit. Rollbacks, which are triggered by various conditions, are
described in the following sections. The control will limit output current based on the lowest
value determined.
6.7.1 Torque/Regeneration Limit
When the VFD output current exceeds the maximum torque-limit setting for the motor, the
drive will limit output current. An inverse speed function based on the Regeneration limit
setting is used during drive deceleration. This forces the drive to absorb a constant amount
of power from the load.Provisions are included for multiple menu settings of
torque/regeneration limits. The control provides a means to use any one of three separate
menu-defined torque/regeneration limits, PLC network control, or analog signal as selected
by the SOP.
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