3.11 Main Menu - Special Functions - Group
14
3.11.1 14-** Special Functions
Parameter group for configuring special frequency
converter functions.
3.11.2 14-0* Inverter Switching
14-00 Switching Pattern
Option:
Function:
Select the switching pattern: 60° AVM or SFAVM.
[0]
*
60 AVM
[1]
SFAVM
14-01 Switching Frequency
Option:
Function:
Select the inverter switching frequency. Changing
the switching frequency can help to reduce
acoustic noise from the motor.
NOTE
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
until the motor is
as noiseless as possible. See also
and the section
Derating
.
[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
NOTE
Enabling over-modulation can cause vibrations that may
destroy the mechanics if running in field weakening ares
(from 47 Hz).
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
max
output voltage without
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).
14-04 PWM Random
Option: Function:
[0]
*
Off No change of the acoustic motor switching noise.
[1]
On 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.
3.11.3 14-1* Mains On/Off
Parameters for configuring mains failure monitoring and
handling.
14-12 Function at Mains Imbalance
Option:
Function:
Operation under severe main imbalance
conditions reduces the lifetime of the motor.
Conditions are considered severe if the motor is
operated continuously near nominal load (e.g. a
pump or fan running near full speed).
When a severe mains imbalance is detected:
[0]
*
Trip
Select
[0] Trip
to trip the frequency converter.
[1]
Warning Select
[1] Warning
to issue a warning.
[2]
Disabled Select
[2] Disabled
for no action.
[3]
Derate
Select
[3] Derate
for derating the frequency
converter.
Parameters for configuring auto reset handling, special trip
handling and control card self test or initialisation.
14-20 Reset Mode
Select the reset function after tripping. Once reset, the frequency
converter can be restarted.
Option:
Function:
[0]
*
Manual reset
Select
[0] Manual reset
, to perform
a reset via [Reset] or via the
digital inputs.
[1]
Automatic reset x 1
Select
[1]-[12] Automatic reset x
1…x20
to perform between one
and twenty automatic resets after
tripping.
[2]
Automatic reset x 2
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
MG16H102 - VLT
®
is a registered Danfoss trademark
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