Instruction Manual

Configuring the UDC Module, Regulator Type, and Parameters 2-7
• Constant Magnetization, Manual Compensation, or Constant Power
These selections define the method the system will use to determine the value used
for magnetizing current in the control algorithm.
The default selection is Manual Compensation which allows operation in the
constant power region up to 2:1. In this case, the value in register 104/1104
(FLX_REF%) is used to scale local tunable STATOR_IZ_E1% where 4095 equals
full magnetizing current.
Select Constant Magnetization to use the value stored in local tunable
STATOR_IZ_E1% for the magnetizing current value. The PMI Processor calculates
this value in response to the PMI_TUN@ command.
Select Constant Power to allow operation in the constant power region up to 4:1. In
this case, the PMI Processor calculates magnetizing current using motor voltage
feedback (flux loop).
2.3.2.1 Constant Magnetization or Manual Compensation
For these two selections, you will need to supply the following information:
• Rated Power (Range: 1 HP to 800 HP or 1 KW to 600 KW)
Enter the power rating of the motor and select HP (default) or KW. There is no
default value.
NOTE:
1 HP = 0.746 KW.
• Rated Motor Voltage (Volts RMS) (Range: 100V to 575V)
Enter the rated RMS motor voltage. There is no default value. A warning message
will be displayed if the value entered is less than 60% or greater than 100% of the
AC Input Voltage parameter. (Note that if the input voltage was entered as DC, it is
converted to AC by the system for this test.)
• Rated Motor Current (Amps RMS) (Range: 1.0A to 3000.0A)
Enter the rated RMS motor current exactly as it appears on the motor nameplate.
The resolution is 0.1 amp. There is no default value. The value can range from 25%
to 100% of the Power Module’s rating at the selected carrier frequency.
• 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:
Rated Motor Current ∗ Torque Overload
Ratio
100
<= Power Module Rated Amps @
Selected Carrier Frequency