Lenze 8400 - Manual (Page 246)

5 Motor control (MCTRL)
5.10 Parameterisable additional functions
246
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Short overview of the relevant parameters:

How to parameterise the flying restart function:
1. Activate the flying restart circuit by selecting "1: On" in C00990 .
• Every time the controller is enabled, a synchronisation to the rotating or standing drive
is carried out.
When the Lenze setting is used, most applications do not require additional controller
settings.
If additional settings are necessary, proceed as follows:
2. Define the process and hence the speed range/rotational frequency range in C00991 which
is to be examined by the flying restart circuit:
• positive speed range (n ≥ 0 rpm)
• negative speed range (n ≤ 0 rpm)
• total speed range
3. Define the starting frequency.
The starting frequency which defines the starting point of the flying restart function is 10
or -10 Hz for processes 0 ... 3 and has been pre-optimised for standard motors.
If process 4 is selected in
C00991 , an arbitrary starting frequency can be defined via
C00992 . This is especially recommended for motors with higher rated frequencies.
• We recommend to define a starting frequency of approximately 20 % of the rated motor
frequency to enable a safe and fast connection to standing drive systems.
• For systems with a known search speed (e.g. torque-controlled drive systems which are
to synchronise to a defined speed) the starting value can be adapted to reduce the flying
restart time.
4. Set the flying restart current in C00994 .
We recommend setting a flying restart current of 10 % ... 25 % of the rated motor current.
• During a flying restart process, a current is injected into the motor to identify the speed.
• Reducing the current causes a reduction of the motor torque during the flying restart
process. A short-time starting action or reversing of the motor is prevented with low
flying restart currents.
• An increase of the current improves the robustness of the flying restart function.
Parameter Info Lenze setting
Value Unit
C00990 Flying restart fct.: Activate Off
C00991 Flying restart fct.: Process -n...+n | Start: +10 Hz
C00992 Flying restart fct.: Start frequency 5 Hz
C00993 Flying restart fct: Int. time 300 ms
C00994 Flying restart fct.: Current 25.00 %