Lenze 9400 - Manual (Page 209)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
209
5 Motor interface
5.8 Parameterisable additional functions
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5.8.3 Flying restart function
This function is available from software version V3.0!
In the case of V/f control or sensorless vector control, the current motor speed is only provided to
the controller if the motor control is active. However, if the controller is enabled, one cannot always
assume that the drive is at standstill. The drive for example may still coast down, or be further
operated by a load. It cannot always be assumed that fans are at standstill if the controller is
enabled, e. g. if the fan impeller is further driven by an air flow in an undefined direction.
If the flying restart mode is activated in
C00990 , after controller inhibit is deactivated (or DC-
injection braking is cancelled), a flying restart process is automatically started to determine the
current motor speed if the following conditions are met:
• V/f control or sensorless vector control are selected as motor control in C00006 .
• The position control structure is set to "Phase controller is active" in C02570 .
• The MI_bFlyingSyncBlocked control input of the motor interface is not assigned or set to FALSE.
• The holding brake, if available, is not applied.

Note!
Function only possible for V/f control or sensorless vector control!

Stop!
If the flying restart function is deactivated and the controller is not enabled at standstill,
the output voltage and output frequency does not match the current motor speed. High
compensation currents may flow!
• The drive is first braked towards 0 Hz and is then accelerated again!
• This may cause the following error messages:
• Controller: Overload during acceleration phases (fault)
• Device utilisation Ixt > C00123 (warning)
• Device utilisation Ixt > 100 % (fault)
• Motor load I
2 xt > C00127 (warning)
• Motor load I 2 xt > C00120 (error)
• Overcurrent detected (fault)
• Overvoltage in DC bus (trouble)

Note!
The flying restart algorithm requires the motor voltage as exact as possible. Therefore it
is absolutely necessary to predetermine the inverter error characteristic.  Optimising
the switching performance of the inverter ( 135)
In addition to the exact motor voltage, the stator resistance must also be known exactly.
If the flying restart function should not work as required, slightly adjust the setting of
the stator resistance in C00084 .