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2 Parameter Description
14-03 Overmodulation
Option:
[0]
Off
[1] *
On
2
14-04 PWM Random
Option:
[0] *
Off
[1]
On
2.13.3 14-1* Mains On/Off
Parameters for configuring mains failure monitoring and handling.
14-10 Mains Failure
Option:
[0] *
No function
[1]
Ctrl. ramp-down
[3]
Coasting
[4]
Kinetic back-up
NB!
For best performance of controlled ramp-down and kinetic back-up par. 1-03
or
Variable Torque
Illustration 2.2: Controlled Ramp-down - short mains failure. Ramping down to stop followed by ramping up to reference.
158
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Function:
Selects no over-modulation of the output voltage in order to avoid torque ripple on the motor shaft.
The over-modulation function generates an extra voltage of up-to 8% of U
over-modulation, which results in an extra torque of 10-12% in the middle of the over-syncronous
range (from 0% at nominal speed rising to approximately 12% at double nominal speed).
Function:
No change of the acoustic motor switching noise.
Transforms the acoustic motor switching noise from a clear ringing tone to a less noticeable 'white'
noise. This is achieved by slightly and randomly altering the synchronism of the pulse width modu-
lated output phases.
Function:
Select the function at which the frequency converter must act, when the threshold set in
par. 14-11
Mains Voltage at Mains Fault
activated via one of the digital inputs (par. 5-1*).
The energy left in the capacitor bank will be used to "drive" the motor, but will be discharged.
The frequency converter will perform a controlled ramp-down. par. 2-10
Off
set to
[0].
The inverter will turn off and the capacitor bank will back up the control card then ensuring a faster
restart when mains reconnected (at short power zags).
The frequency converter will ride through by controlling speed for generative operation of the motor
utilizing the moment of inertia of the system as long as sufficient energy is present.
[1] (no automatic energy optimization should be active).
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
output voltage without
max
has been reached or a
Mains Failure Inverse
Brake Function
Torque Characteristics
should be set to
Programming Guide
command is
must be
Compressor
[0]
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