Parameters 14-** Special Functions - Danfoss VLT AQUA Drive FC 202 Programming Manual

Parameter Description

3.13 Parameters 14-** Special Functions

3.13.1 14-0* Inverter Switching
14-00 Switching Pattern
3 3
Option:
[0] 60 AVM
[1] SFAVM
14-01 Switching Frequency
Option:
[0] 1.0 kHz
[1] 1.5 kHz
[2] 2.0 kHz
[3] 2.5 kHz
[4] 3.0 kHz
[5] 3.5 kHz
[6] 4.0 kHz
[7] 5.0 kHz
[8] 6.0 kHz
[9] 7.0 kHz
[10] 8.0 kHz
[11] 10.0 kHz
[12] 12.0kHz
[13] 14.0 kHz
[14] 16.0kHz
14-03 Overmodulation
Option: Function:
[0] Off Selects no over-modulation of the output voltage in
order to avoid torque ripple on the motor shaft.
[1] On 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).
112
Function:
Select the switching pattern: 60° AVM or SFAVM.
Function:
Select the inverter switching frequency. Changing
the switching frequency can help to reduce
acoustic noise from the motor.
NOTICE
The output frequency value of the
frequency converter must never exceed
1/10 of the switching frequency. When the
motor is running, adjust the switching
frequency in parameter 14-01 Switching
Frequency until the motor is as noiseless as
possible. See also
parameter 14-00 Switching Pattern and
section Derating in the FC 302 Design
Guide.
output voltage without
max
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Programming Guide
14-04 PWM Random
Option: Function:
[0] Off No change of the acoustic motor switching noise.
[1] On
3.13.2 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
[6] Alarm
NOTICE
For best performance of controlled ramp down and
kinetic back-up 1-03 Torque Characteristics should be set
to Compressor [0] or Variable Torque [1] (no automatic
energy optimization should be active).
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 modulated output
phases.
Function:
Select the function at which the frequency
converter must act, when the threshold set in
parameter 14-11 Mains Voltage at Mains Fault has
been reached or a Mains Failure Inverse command
is activated via one of the digital inputs
(parameter group 5-1* Digital Inputs).
Only selection [0] No function, [3] Coasting or [6]
Alarm is available when parameter 1-10 Motor
Construction is set to [1] PM, non-salient SPM.
The energy left in the capacitor bank is used to
run the motor, but is discharged.
The frequency converter performs a controlled
ramp down. Parameter 2-10 Brake Function must
be set to [0] Off.
The frequency converter turns off and the
capacitor bank backs up the control card then
ensuring a faster restart when mains reconnected
(at short power zags).
The frequency converter rides through by
controlling speed for generative operation of the
motor utilising the moment of inertia of the
system as long as sufficient energy is present.
MG20O702