Parameter descriptions
Operation mode power failure regulation.
Voltage controller: Parameter Operation mode 670 = 2
without Mains resumption
671 Mains Failure Threshold
672 Reference Mains Support Value
With the power failure regulation, short-term power failures can be bridged. Mains failure is detected
when the DC link voltage has dropped below the set value of parameter
Mains Failure Threshold
671. If a mains failure is detected, the controller tries to regulate the DC link voltage to the value set
with parameter
Reference Mains Support Value 672. To that end, the output frequency is continuous-
ly reduced and the motor with its rotating masses is switched over to generator operation. Using field
oriented Control (FOC, SERVO) the reduction of the output frequency is done according to the config-
uration with a maximum of the current set by the parameter
Gen. Ref. Current Limit 683.
Gen. Ref. Current Limit 683 is active in configurations 410 and 610
(FOC and SERVO).
The threshold values of the voltage controller are calculated starting with the current DC link voltage
with the parameters
Mains Failure Threshold 671 and Reference Mains Support Value 672.
If the mains voltage is restored before a switch-off is effected by the mains undervoltage detection
system, the drive is accelerated to its reference frequency at the set acceleration or according to the
parameter
Acceleration on Mains Resumption 674. If the value of parameter Acceleration on Mains
Resumption
674 is set to the default value of 0.00 Hz/s, the drive is accelerated at the values set for
the ramp parameters
Acceleration (Clockwise) 420 or Acceleration Anticlockwise 422.
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
217
Control functions 06/2013 Operating Instructions
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