Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
157
Application Specific Features
7
7.1 Control Mode Summary
The NXG Control provides six control modes for the Perfect Harmony drive family. These
modes are described as follows:
● CLVC - Closed Loop Vector Control
CLVC provides flux vector control for an induction machine utilizing an encoder for speed
feedback.
● CSMC - Closed Loop Synchronous Machine Control
CSMC is a flux vector control for a synchronous machine utilizing an encoder for speed
feedback and providing a field excitation command for use by an external field exciter.
● OLTM - Open Loop Test Mode
OLTM is intended for running the drive with no load attached to permit verifying the
output voltage waveforms.
Note
OLTM is intended for test purposes only and should not be used to control a motor.
● OLVC - Open Loop Vector Control, also known as Encoderless Vector Control
OLVC is a flux vector control for induction machines that computes the rotational speed
of the rotor based on measured output currents from the drive, and uses this computed
speed as the speed feedback.
● SMC - Synchronous Motor Control
SMC computes the rotational speed similarly to open-loop vector control, and controls the
field reference or the synchronous motor as in closed-loop synchronous motor control.
The field reference is controlled to achieve unity power factor.
● VHZ - Volts per Hertz control
V/Hz is intended to be used when multiple induction motors are connected in parallel to
the output of the drive. V/Hz operates similarly to open-loop vector control with de-tuned
current regulators.
Note
Spinning Load and Fast Bypass are not available in V/Hz control mode.
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