Parameter Reference
D-74
AC30V series Variable Speed Drive
PMAC SVC
Parameters::Motor Control::PMAC SVC
Only available if PMAC MOTOR selected in
Control Mode.
Parameters related to the
SVC Control mode
of a PMAC Motor
PNO Parameter Descriptions
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
PMAC SVC LPF Speed Hz
Set the Low Pass Filter frequency of the estimated speed.
PMAC SVC P Gain
Set the Proportional gain of the PI corrector used for extracting speed and position.
PMAC SVC I Gain Hz
Set the Integral frequency of the PI corrector used for extracting speed and position.
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.
