Rockwell Automation 1336T Master/Slave Parallel AC Drv - Manual (Page 8)

1336 FORCE-5.19 – August, 2000
1-4 Introduction
Two-Phase Modulation
A control feature specific to the Parallel Drive operation is a two-
phase PWM modulator. The parallel drives change from compensated
sine-triangle modulation to two-phase modulation at approximately
65% of drive voltage utilization. This extends the stable operating
speed range specific to the parallel drives.
Figure 1.3
1336 Two-Phase Modulation Implementation for Parallel Drives