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 overmodulation of the output voltage to
avoid torque ripple on the motor shaft.
[1] On The overmodulation function generates an extra
*
voltage of up to 8% of U
overmodulation. This extra voltage results in an extra
torque of 10–12% in the middle of the oversyn-
chronous range (from 0% at nominal speed, rising to
approximately 12% at double nominal speed).
132
Function:
Select the switching pattern: 60° AVM or SFAVM.
Function:
Select the inverter switching frequency. Changing
the switching frequency can help 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. For
information about derating, see the
relevant design guide.
output voltage without
max
Danfoss A/S © 05/2018 All rights reserved.
®
VLT AQUA Drive FC 202
14-04 Acoustic Noise Reduction
Option:
[0] Off No change of the acoustic motor switching noise.
*
[1] On Select to reduce the acoustic noise from the motor.
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
Function:
Function:
Select the function by which the frequency
converter must act when the threshold set in
parameter 14-11 Mains Fault Voltage Level has been
reached or a Mains Failure Inverse command is
activated via 1 of the digital inputs (parameter
group 5-1* Digital Inputs).
Only selections [0] No function, [3] Coasting, or [6]
Alarm are 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, thus
ensuring a faster restart when mains reconnect (at
short power zags).
Kinetic back-up ensures that the frequency
converter keeps running as long as there is
energy in the system due to the inertia from
motor and load. This is done by converting the
mechanical energy to the DC link and maintaining
control of the frequency converter and motor.
This can extend the controlled operation,
depending on the inertia in the system. For fans,
it is typically several seconds; for pumps up to 2 s;
and for compressors only for a fraction of a
second. Many industry applications can extend
controlled operation for many seconds, which is
often enough time for the mains to return.
MG20OB02