Torque Controller - Danfoss iC7 Series Application Manual

Application Guide | iC7 Series Industry
Flying Start
2.2.8
Flying start enables the drive to synchronize to a freely spinning motor, before taking control of the motor. Taking over control of the
motor at the actual speed minimizes mechanical stress to the system. This feature is relevant in fan and centrifuge applications, for
example.
2.2.9 Mains Dropout
If there is a mains dropout and the drive cannot continue operation, it is possible to select predefined corrective actions. These actions
include a trip, coasting, or performing a controlled ramp down.
Kinetic Backup
2.2.10
Kinetic backup enables the drive to remain in control if there is sufficient energy in the system, as inertia or when lowering a load, for
example. The function allows a controlled stop of the machine.
Resonance Damping
2.2.11
High-frequency motor resonance noise can be eliminated by using resonance damping. Both automatic and manually selected
frequency damping is available.
Motor Preheating
2.2.12
In cold and damp environments, the motor must be preheated to avoid condensation and cold starts. The feature DC Start generates a
small DC current through the motor windings, keeping the temperature above the surrounding temperature.
Mechanical Brake Control
2.2.13
In applications like cranes, lifts and hoists, or downhill conveyors, a mechanical brake is used to keep the load at standstill when the
motor is not controlled by the drive or when power is turned off.
The mechanical brake control feature ensures a smooth transition between the mechanical brake and the motor holding the load, by
controlling the activation and deactivation of the mechanical brake.
2.2.14 Load Drooping
The load drooping function ensures that multiple motors, each controlled by a drive and connected to a common mechanical shaft,
share the load. The function is typically used in cranes, winches, or larger conveyor systems controlled by 2 or more motors.
Controllers
2.3
Speed Controller
2.3.1
A built-in speed PID controller provides accurate control of the rotational speed of the motor. The controller offers control in both open
and closed-loop configuration.
Open-loop mode does not require an external sensor for measuring the feedback signal. This allows easy installation and commissioning
and eliminates the risk of defective sensors.
In closed-loop mode, a speed sensor is added, offering highly accurate control.
The parameters of the speed controller can be optimized by the built-in auto tuning function.

Torque Controller

2.3.2
A built-in torque controller provides optimized control of torque. Typical use cases are in tension control for winches or extruders. The
drive offers both open-loop control where the current sensors provide the feedback and a closed-loop control with feedback provided
by an external torque sensor.
16 | © 2024.05
Industry Application Software Overview
AB480436531518en-000601 / 136R0283