Danfoss iC7 Motion Series Application Manual page 17

Application Guide | iC7 Series Motion
Torque Characteristics
2.4.2
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.
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Constant torque: Load characteristic used in machinery where torque is needed across the full speed range. Typical applications are
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conveyors, extruders, decanters, compressors, and winches.
Motor Control Principles
2.4.3
Different control principles can be selected to control the motor, matching the needs of the application:
U/f control for simple open-loop operation.
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VVC+ (Voltage Vector Control) in both open and closed loop, for general-purpose application needs.
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FVC+ (Flux Vector Control) in both open and closed loop, for demanding application needs.
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Motor Nameplate Data
2.4.4
Typical motor data for the drive are preset at the factory. The preset data allow operation of most motors. During commissioning, actual
motor data are entered in the settings of the drive to optimize motor control.
Automatic Motor Adaptation (AMA)
2.4.5
Automatic Motor Adaptation (AMA) optimizes motor parameters for improved shaft performance. Based on motor product label data
and measurements of the motor at standstill, key motor parameters are recalculated, and used to fine-tune the motor control algorithm.
Automation Energy Optimization (AEO)
2.4.6
The Automatic Energy Optimization (AEO) feature optimizes control with focus on lowering energy consumption at the actual load point.
Braking of Load
2.5
Overview of Braking of Load
2.5.1
For controlled load braking performed by the drive, various functions can be used. The specific function is selected based on the
application and how fast the load has to be stopped.
Resistor Braking
2.5.2
In applications that require fast or continuous braking, a drive fitted with a brake chopper is typically used. Excess energy, generated by
the motor during the braking of the application, is dissipated in a connected brake resistor. Braking performance depends on the specific
drive rating and the selected brake resistor.
Overvoltage Control (OVC)
2.5.3
If braking time is not critical or the load is varying, the overvoltage control (OVC) feature can be used to control the stopping of the
application. The drive extends the ramp-down time when it is not possible to brake within the defined ramp-down period. This feature
must not be used in hoisting applications, high inertia systems, or applications where continuous braking is required.
DC Brake
2.5.4
When braking at low speed, the braking of the motor can be improved by using the DC brake feature. The software offers configurable
DC-braking for induction motor control. It injects a user-defined DC current.
© 2023.11 AB318753549016en-000301 / 136R0284 |
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