Lenze 8200 Frequency inverters Manual de usuario Pagina 150

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Configuration
8200SHB0199
7-13
7.4.3.2 Automatic parameter set changeover for controlled
deceleration in the event of mains failure
Code Possible settings IMPORTANT
No. Name Lenze Choice
C988* DC-bus voltage
threshold for
DC-bus voltage
control
0 0 {1 %} 200 C988 = 0 %
- Parameterset changeover
deactivated via DC-busvoltage
Changeover always betweenPAR1
and PAR2
Parameterset changeover isnot
possible via terminal, bus or PC if
C988 > 0!
Function Controlleddecelerationof the motor to standstill (f
d
= 0) when switching the mains or in the
eventof mains failure.
If the motor is not standing still when being reconnected to the mains, it is accelerated along the
accelerationramp (C0012)tothe preselectedsetpoint. There is nodelaytime as it occurswith
active flying-restart circuit.
The function can be used with or without external brake resistor:
Without external brake resistor
Controlleddeceleration of the motor to standstill (f
d
= 0) when the controller is active.
The braking energy is generated through the system losses (controller and motor).
Withexternal brake resistor Automatic, fast deceleration of the motor to standstill (f
d
=0).
The deceleration time is shorter than without external brake resistor.
Functionality 1.Mains voltage is interrupted.
2.U
G
becomeslower than the value in C0988 PAR1 is activated.
3.QSP in PAR1 starts operation in generator mode.
4.U
G
becomes higherthanthe value inC0988.
5.PAR2 is activated The motor accelerates with T
ir
(C012 in PAR2).
6.The rotationenergyin the motor keeps U
G
at its min. value until the motor speed is approx. 0.
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