Danfoss iC2-Micro Series Design Manual page 28

Design Guide | iC2-Micro Frequency Converters
Automatic Restart
3.6.2.10
In case of a minor fault and trip, the drive can do an automatic restart, eliminating a manual reset of the drive. This enhances automated
operation in remotely controlled systems. Make sure that dangerous situations cannot occur when using automatic restart.
Flying Start
3.6.2.11
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. For example, the feature is relevant in fan and centrifuge
applications.
Mains Dropout
3.6.2.12
In case of mains dropout, where the drive cannot continue operation, it is possible to select predefined actions, for example trip, coast, or
performing a controlled ramp down.
Kinetic Backup
3.6.2.13
Kinetic backup enables the drive to remain in control if there is sufficient energy in the system, for example, as inertia or when lowering a
load. This allows a controlled stop of the machine.
Resonance Damping
3.6.2.14
High-frequency motor resonance noise can be eliminated through the use of resonance damping. Both automatic and manually
selected frequency damping are available.
Mechanical Brake Control
3.6.2.15
In applications like simple hoists, palletizers, stereoscopic warehouse, 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 motor holding the load by
controlling the activation and deactivation of the mechanical brake.
Controllers
3.6.2.16
The drive has 3 different controllers providing optimized control of the actual application. The controllers cover:
Process control
l
Speed control open loop
l
Torque control open loop
l
Process controller
The process controller can control a process, for example, in a system where a constant pressure, flow, or temperature is needed.
Feedback from the application is connected to the drive, providing the actual output value. The controller ensures that the output is
matching the reference provided by controlling the motor speed. The reference source and the feedback signals are converted and
scaled to the actual values controlled.
Speed controller
The open-loop speed control provides accurate control of the motors rotational speed.
In open-loop mode (without external feedback signal of the speed), there is no need for external sensors. The open-loop speed control
makes installation and commissioning easier, and eliminates the risk of defective sensors.
Torque controller
A built-in torque controller provides optimized control of torque and supports open-loop control.
28 | Danfoss A/S © 2024.08
iC2-Micro Frequency Converters
AJ402315027937en-000401 / 130R1239