Parker AC30 series, Manual

Page: 369 / 462

Parameter Reference
C-187
AC30 series Variable Speed Drive
Scale Setpoint
Parameters::Motor Control::Scale Setpoint
This function defines 100% speed in RPM.
Parameter Name No. Path Default Range Units Writable
100% Speed in RPM
464
Setup::Motor Control
::
Control and Type
Parameters::Motor Control::Scale
Setpoint
1500.0
0.0 to 100000.0
RPM
ALWAYS
Speed in RPM equivalent to a setpoint of 100%
Speed Demand RPM
465
Parameters::Motor Control::Scale Setpoint
x.x
RPM
NEVER
Setpoint scaled to RPM
Speed Demand Hz
466
Parameters::Motor Control::Scale Setpoint
x.x
Hz
NEVER
Setpoint scaled to electrical Hz.
Functional Description
The Drive is commanded to run the motor at a certain speed, which is derived from various sources, such as comms, analog inputs, commands from
the keypad, etc. All these speed commands are expressed as a percentage. The percentage is referenced to parameter PNO 0464. So, for
example, if PNO 0464 is set to 3000 rpm, and the user commands 100% speed, then the motor should turn at 3000rpm.
The user should be aware of what PNO 0464 means for different control options:
- For vector control (both for PMAC and IM) for 100% demand the motor will provide the actual shaft speed of the value that
is set in PNO 0464.
- For V/Hz control (IM only) for 100% demand the actual shaft speed will be the value set in this parameter less than the slip
of the motor. So, in order to achieve rated speed at rated torque in V/Hz mode, the user should set PNO 0464 to an RPM
value that corresponds to the base frequency of the motor with the number of pole pairs taken into account, or in other
words, ‘100% Speed in RPM’ should be set to synchronous speed.
(For example, a 50Hz, 4 pole induction motor, with rated
speed of 1450RPM, should have its ‘100% Speed in RPM’ value set to 1500. This will ensure that in V/Hz mode when the
motor is loaded with rated load the actual speed of the shaft will be 1450 RPM!)
This parameter also represents the maximum speed available, since (apart from a small allowance for process trims) the speed commands are not
allowed to exceed 100%.