Lenze 8200 Frequency inverters - Manual (Page 150)

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 %
- Parameter set changeover
deactivated via DC-bus voltage
- Changeover always between PAR1
and PAR2
- Parameter set changeover is not
possible via terminal, bus or PC if
C988 > 0!
Function - Controlled deceleration of the motor to standstill (f
d
= 0) when switching the mains or in the
event of mains failure.
- If the motor is not standing still when being reconnected to the mains, it is accelerated along the
acceleration ramp (C0012) to the preselected setpoint. There is no delay time as it occurs with
active flying-restart circuit.
The function can be used with or without external brake resistor:
Without external brake resistor - Controlled deceleration 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).
With external 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
becomes lower than the value in C0988 ⇒ PAR1 is activated.
3.QSP in PAR1 starts operation in generator mode.
4.U
G
becomes higher than the value in C0988.
5.PAR2 is activated
⇒
The motor accelerates with T
ir
(C012 in PAR2).
6.The rotation energy in the motor keeps U
G
at its min. value until the motor speed is approx. 0.
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