Installation Manual

Startup
56 9000X AF Drives MN04001004E—May 2011 www.eaton.com
Fine Tuning Parameters
Adjust the following parameters for optimum performance in closed loop mode:
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.
615 Zero Speed Time at Start
After giving the start command, the drive will remain at zero speed for the time defined by this parameter. The ramp is
released to follow the set frequency/speed reference after this time has elapsed.
616 Zero Speed Time at Stop
The drive will remain at zero speed with controllers active for the time defined by this parameter after reaching the zero
speed when a stop command is given. This parameter has no effect if the selected stop function (P1.4.7) is coasting.
621 Startup Torque
This parameter selects the startup torque.
Torque memory is used in crane applications. Startup torque FWD/REV can be used in other applications to help the
speed controller.
0 = Not Used
1 = TorqMemory
2 = Torque Ref
3 = Torq.Fwd/Rev