Flying Restart Function - Lenze L-force HighLine C 8400 Series Reference Manual

8400 HighLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.10.4

Flying restart function

The flying restart circuit for asynchronous motors uses a simple motor model which
requires knowledge of the motor stator resistance RS and the rated motor current.
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Note!
• Currently, the flying restart circuit is only available for asynchronous motors.
(A flying restart circuit for synchronous motors is in preparation.)
• For a correct functioning of the flying restart circuit, we recommend to
perform a parameter identification first.
identification
• The flying restart function works safely and reliably for drives with great
centrifugal masses.
• Do not use the flying restart function if several motors with different
centrifugal masses are connected to a controller.
• After the controller is enabled, the motor can start for a short time or reverse
when machines with low friction and low mass inertia are used.
• The flying restart function serves to identify max. field frequencies up to
±200 Hz.
• When power-adapted standard asynchronous motors are used (rated motor
power approximately corresponds to the rated inverter power), a motor
parameter identification is not required.
• On drive systems with feedback, you do not need to use the flying restart
function because the synchronisation to the speed detected by the feedback
is always carried out in a jerk-free manner.

Tip!
In association with the flying restart function, we recommend information
provided in this documentation on the following topic:
Automatic DC-injection braking (Auto-DCB)
General information
This function serves to activate a mode which is used to "catch" a coasting motor during
operation without speed feedback. This means that the synchronicity between controller
and motor is to be adjusted in such a way that a jerk-free transition to the rotating
machines is achieved in the instant of connection.
The drive controller determines the synchronicity by identifying the synchronous field
frequency.
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Automatic motor data
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Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011