D-74 Parameter Reference
AC30V series Variable Speed Drive
PMAC SVC
Parameters::Motor Control::PMAC SVC
Parameters related to the SVC Control mode of a PMAC Motor
PNO Parameter Descriptions
0467 PMAC SVC Auto Values
Selection of pre-calculated values
When selected, do some pre-calculations of the following PMAC SVC parameters:
PMAC SVC LPF Speed Hz
PMAC SVC P Gain
PMAC SVC I Gain Hz
0468 PMAC SVC LPF Speed Hz
Set the Low Pass Filter frequency of the estimated speed.
0469 PMAC SVC P Gain
Set the Proportional gain of the PI corrector used for extracting speed and position.
0470 PMAC SVC I Gain Hz
Set the Integral frequency of the PI corrector used for extracting speed and position.
0476 PMAC SVC Open Loop Strt
This parameter is used to enable/disable a specific startup procedure when the motor/drive is switched ON (starting rotation). This
parameter is also used to work in up – down motion, where we need to go down to zero speed or crossing the zero speed point.
When set TRUE, the following procedure is applied each time the motor is switched on and before closing the speed loop, based on
the external speed setpoint.
The drive must be used in speed loop mode.
When the drive is switched ON, the system is placed in open loop control.
Step 1:
For a time equal to the ‘PMAC SVC Start Time’ parameter, the current is ramped to the PMAC SVC Start Cur value. The sign is
dependent upon the speed loop setpoint. A normal value is between 0.5 to 1s.
Step 2:
Once Step 1 is complete, the position is ramped in such a way as to follow the speed setpoint generated, based on the configuration
(ramp, etc…), until the PMAC SVC Start Speed value is reached. The speed loop is then closed.
The ramp value must be kept low to ensure the motor follows the speed setpoint.
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