Rockwell Automation SA3100 Distributed Power System Drv Config,Program - Manual (Page 22)

2-10 SA3100 Drive Configuration and Programming
• Speed (RPM) (Range: 10 to 10,000)
Enter all speed values in RPM; the resolution is 1 RPM. There are no default
values.
Base: Enter the base (rated) speed of the motor. The base speed value represents
the speed where the motor enters the constant power region. This value is used to
determine the rated slip of the motor at the rated motor frequency. This value is
found on the motor’s nameplate.
S1: Enter the speed at which maximum voltage is reached. If the rated voltage is
not equal to the maximum voltage of the motor, the PMI Processor will
automatically calculate the value of S1 when you select “Verify.” If rated voltage
and maximum voltage are the same, you must enter this value manually. This
information is located on the motor design data sheet.
S2-S4: Enter additional speed values as required by the motor design. The
additional speed values represent taper points of the constant power region. Note
that the additional speed values cannot be greater than four times the base speed.
• Current (Amps)
Enter all current values in amps; the resolution is 0.1 amp. This value can range
from 25% to 100% of the Power Module’s rating at the selected carrier frequency.
Base: Enter the base (rated) RMS motor current exactly as it appears on the motor
nameplate. There is no default value.
Enter additional current values at each speed (e.g., C1 corresponds to the motor
current level at speed S1). This information is located on the motor design data
sheet.
• Torque Overload Ratio (%) (Range: 25 to 400)
The Torque Overload Ratio determines the maximum RMS current that can be
supplied to the motor by the Power Module. The ratio affects only the Iq (torque)
component of RMS current to the motor. Enter the torque overload ratio in percent
of rated motor torque, which can be calculated from the rated speed and HP. For
example, 150% of rated motor torque is entered as 150. The default value is 100.
The resolution is 1%. See Appendix E for how to calculate the effect of the ratio on
maximum RMS current.
A warning will be generated if the following condition is not met:
Note that the Power Module Rated Amps at Carrier Frequency value is based on
either the carrier frequency selected during parameter entry or the carrier frequency
calculated by the system, whichever is greater. The carrier frequency is calculated
by the system using the following equation:
Calculated Carrier Frequency = 20
∗
Freq. at Rated Voltage
∗
Max. Speed
Base Speed
Rated Motor Current
∗
Torque Overload
Ratio
100
<
= Power Module Rated Amps @
Selected Carrier Frequency