Operating Instructions ACTIVE06/07 161
06/07 Operating Instructions ACTIVE 161
Parameter Settings
No. Description Min. Max. Fact. sett.
671 Mains Failure Threshold -200.0 V -50.0 V -100.0 V
672 Reference Mains Support Value -200.0 V -10.0 V -40.0 V
Note: The frequency inverter reacts to the signals at the control inputs both
when the power failure regulation is switched on and in normal operation.
A control via externally supplied control signals is only possible in the case
of a no-break supply. As an alternative, supply through the frequency
inverter is to be used.
Operation mode mains failure regulation (continued)
f
671
676
672
Mains voltage
Power failure
Off
t
Ud
Ud, f
675
673 or 683
The DC link voltage which is available in the case of a power failure is supplied by the
motor. The output frequency is continuously reduced and the motor with its rotating
masses is switched over to generator operation. The maximum reduction of the out-
put frequency is done at the current set by the parameter
Gen. Ref. Current Limit
683 or the ramp
Mains Support Deceleration 673 until the frequency limit Shutdown
Threshold
675 is reached. If the energy of the system for bridging the mains failure is
not sufficient, the delay occurs at maximum ramp gradient as from the
Shutdown
Threshold
675.
The time required until the motor has come to a standstill results from the regenera-
tive energy of the system which results in an increase in the DC link voltage. The DC
link voltage set with the parameter
Reference Shutdown Value 676 is used by the
voltage controller as a control figure and kept constant. The voltage rise enables op-
timization of the braking behavior and the time until the drive has come to a standstill.
The behavior of the controller can be compared to stopping behavior 2 (Shutdown +
Stop), as the voltage controller brings the drive to a standstill at the maximum decel-
eration ramp and supplies it with the remaining DC link voltage.
If the mains voltage is restored after the shutdown of the drive but before the under-
voltage switch-off has been reached, the frequency inverter signals a fault. The con-
trol unit displays the fault message "F0702".
If the mains failure without shutdown (
Shutdown Threshold 675 = 0 Hz) takes so
long that the frequency has been reduced to 0 Hz, the drive is accelerated to the ref-
erence frequency when the mains supply is restored.
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