Spinning Load Implementation
The spinning load feature is divided into two stages:
• During the rst stage, spinning load operates automatically when enabled, and requires no
user adjustments. The drive control monitors motor ux and is able to provide an
instantaneous restart. This stage is valid as long as there is detectable ux in the motor.
Typically the drive is capable of restarting instantaneously, if the time duration between drive
disable and restart is within 3 to 4 motor time constants.
• The second stage consists of a scan feature during which a xed level of current of varying
frequency is applied to the motor. This is set via the current level setpoint parameter (2450).
The control monitors the measured motor ux. When the motor ux exceeds a ux threshold,
set by the scan end threshold parameter (2440), the control assumes that the applied
frequency is equal to the rotating speed of the motor. This stage requires parameters to be
tuned in order for the scan to function properly.
Parameters for Spinning Load
Refer to the Spinning Load Menu (2420) in Section Options for Drive Menu (2) of
Chapter Parameter Assignment / Addressing for parameters associated with this function.
Operating the Control
7.13 Drive Tuning
NXGPro+ Control Manual
228 Operating Manual, A5E50491925A
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