9000X AF Drives User Manual
6-12 For more information visit: www.eaton.com
MN04001004E
June 2009
Figure 6-5: Closed Loop Motor Voltage
Adjust the following parameters for optimum performance in closed loop mode:
Fine Tuning Parameters
40 Hz
60 Hz
460V
Closed Loop
Motor Voltage
307 V
613 Speed control P gain
Sets the gain for the speed controller in % per Hz. 100 means nominal torque with 1 Hz
frequency error.
614 Speed control I time
Sets the integral time constant for the speed controller. Too short integration time
makes the control unstable.
620 Load drooping
Setting a proper value to the LoadDrooping parameter enables the load drooping.
This function causes the speed to decrease as the load torque increases. At rapid load
changes this gives a smoother torque response, when a part of the required power is
taken from the system inertia. This operation causes a constant, torque-dependent
steady-state error in speed response.
626 Acceleration compensation
Sets the inertia compensation to improve speed response during acceleration and
deceleration. The time is defined as acceleration time to nominal speed with nominal
torque. This parameter is active also in advanced open loop mode.
627 Magnetizing current at start
628 Magnetizing time at start
These parameters are certain type of DC-brake in start. With these parameters it is
possible to shorten the time needed to fully magnetize the motor, especially when
motor is big.
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