Rockwell Automation 1336VT AC DRIVE 5-300AMP (2-160KW) PROGRAMMING MANUAL - Manual (Page 21)

Local and Serial Port Parameters
Firmware Version 1.01-3.01
Chapter 3
3-7
Parameter 9 Ċ DC Boost Select
Freq P R
P R Enter Code
0
12
2
Read and Write
Units
Minimum Value
Maximum Value
Factory Setting
This parameter provides a selectable DC boost voltage to the motor at low
drive frequency to allow the drive/motor combination to be adapted to
various starting torque conditions. Usually increased starting torque
requires more DC boost. High boost may produce unnecessary current at
low frequency and contribute to motor overheating. Excessive boost may
force the drive into MOPC resulting in poor drive performance. The
optimum DC boost is the lowest level that will permit satisfactory starting
torque in a properly sized motor and drive application.
Values 0 and 1 are especially reduced curves that also reduce the
volts-per-hertz curve up to Base Frequency. These values are intended for
use with drive/motor applications on fans and pumps where full rated
motor torque is not required at reduced speeds.
Zero (0) produces zero boost at 0 Hz, and 30% of the Base Voltage set in
Parameter 18 at 50% of the Base Frequency set in Parameter 17.
One (1) produces zero boost at 0 Hz, and 42% of the Base Voltage set in
Parameter 18 at 50% of the Base Frequency set in Parameter 17.
Values 2 through 10 produce increasingly higher DC boost until the
straight line volts-per-hertz curve set by Parameter 17 and 18 equals the set
Boost Voltage.
2 = 0V DC boost
3 = 6V DC boost
4 = 12V DC boost
5 = 18V DC boost
6 = 24V DC boost
7 = 30V DC boost
8 = 36V DC boost
9 = 42V DC boost
10
= 48V DC boost
11 is a custom volts-per-hertz and DC boost mode that uses Parameters 48,
49 and 50. Refer to these parameters for additional details.
12 is also a custom volts-per-hertz and DC boost mode that uses
Parameters 48 and 83. Refer to these parameters for additional details.