Motor Control Features; Braking Of Load - Danfoss iC2-Micro Anwendungshandbuch

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2.1.3 Motor Control Features

The motor control covers a wide range of applications, control from the most basic applications to applications requiring high-per-
formance motor control.
2.1.3.1 Motor Types
The drive supports standard available motors like:
• Asynchronous motors
• Permanent magnet motors
2.1.3.2 Load Characterstics
Different load characteristics are supported to match the actual application needs:
• Variable torque: Typical load characteristic of fans and centrifugal pumps, where the load is proportional to the square of the
speed.
• Constant torque: Load characteristic used in machinery where torque is needed across the full speed range. Typical application
examples are conveyors, extruders, decanters, compressors, and winches.
2.1.3.3 Motor Control Principle
Different control principles can be selected to control the motor, matching the application needs:
• U/f control for special control
• VVC+ control for the general-purpose application needs
2.1.3.4 Motor Nameplate and Catalog
Typical motor data for the actual drive are preset from factory, allowing operation of most motors. During commissioning, actual
motor data are entered in the settings of the drive, optimizing the motor control.
2.1.3.5 Automatic Motor Adaptation (AMA)
Automatic Motor Adaptation (AMA) provides optimization of motor parameters for improved shaft performance. Based on motor
nameplate data and measurements of the motor at standstill, key motor parameters are being recalculated and used to fine tune
the motor control algorithm.
2.1.3.6 Automation Energy Optimization (AEO)
The Automatic Energy Optimizer (AEO) feature optimizes the control with focus on lowering energy consumption at the actual load
point.

2.1.4 Braking of Load

When braking the motor controlled by the drive, various functions can be used. The specific function is selected based on the appli-
cation and the needs for how fast it should be stopped.
2.1.4.1 Resistor Braking
In applications where fast or continuous braking is required, a drive fit with a brake chopper is typically used. Excess energy gener-
ated by the motor during braking of the application will be dissipated in a connected brake resistor. Braking performance depends
on the specific drive rating and selected brake resistor.
2.1.4.2 Overvoltage Control (OVC)
If braking time is not critical or the load is varying, the overvoltage control (OVC) feature is used to control stopping the application.
The drive extends the ramp down time when it is not possible to brake within the defined ramp-down period. The feature should
not be used in hoisting applications, high inertia systems, or where continuous braking is required.
2.1.4.3 DC Brake
When braking at low speed, the braking of the motor can be improved by using the DC brake feature. It adds a small DC current on
top of the AC current, slightly increasing the brake capability.
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