l Coast with flying start whenever mains return (parameter 1-73 Flying Start).
l Kinetic back-up.
l Controlled ramp down.
Flying start
This selection makes it possible to catch a motor that is spinning freely due to a mains dropout.
Kinetic back-up
This selection ensures that the drive runs as long as there is energy in the system. For short mains dropout, the operation is restored after
mains return, without bringing the application to a stop or losing control at any time. Several variants of kinetic back-up can be selected.
Configure the behavior of the drive at mains dropout in parameter 14-10 Mains Failure and parameter 1-73 Flying Start.
3.3.6 Automatic Restart
The drive can be programmed to restart the motor automatically after a minor trip, such as momentary power loss or fluctuation. This
feature eliminates the need for manual resetting and enhances automated operation for remotely controlled systems. The number of
restart attempts and the duration between attempts can be limited.
3.3.7 Full Torque at Reduced Speed
The drive follows a variable V/Hz curve to provide full motor torque even at reduced speeds. Full output torque can coincide with the
maximum designed operating speed of the motor. This drive differs from variable torque drives and constant torque drives. Variable
torque drives provide reduced motor torque at low speed. Constant torque drives provide excess voltage, heat, and motor noise at less
than full speed.
3.3.8 Frequency Bypass
In some applications, the system can have operational speeds that create a mechanical resonance. This mechanical resonance can
generate excessive noise and possibly damage mechanical components in the system. The drive has 4 programmable bypass-frequency
bandwidths. The bandwidths allow the motor to step over speeds that induce system resonance.
3.3.9 Motor Preheat
To preheat a motor in a cold or damp environment, a small amount of DC current can be trickled continuously into the motor to protect
it from condensation and cold starts. This function can eliminate the need for a space heater.
3.3.10 Programmable Setups
The drive has 2 setups that can be independently programmed. Using multi-setup, it is possible to switch between independently
programmed functions activated by digital inputs or a serial command. Independent setups are used, for example, to change references,
or for day/night or summer/winter operation, or to control multiple motors. The LCP shows the active setup. Setup data can be copied
from drive to drive by downloading the information from the removable LCP.
3.3.11 Smart Logic Control (SLC)
Smart logic control (SLC) is a sequence of user-defined actions (see parameter 13-52 SL Controller Action [x]) executed by the SLC when
the associated user-defined event (see parameter 13-51 SL Controller Event [x]) is evaluated as TRUE by the SLC.
The condition for an event can be a particular status, or that the output from a logic rule or a comparator operand becomes TRUE. The
condition leads to an associated action as shown in the following illustration.
20 | Danfoss A/S © 2024.01 AJ435824192086en-000101 / 130R1295
Design Guide | VLT® AutomationDrive FC 360
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