Main Menu - Special Functions - Group - Danfoss VLT CDS 803 Programming Manual

Parameters

3.10 Main Menu - Special Functions - Group

14
3.10.1 14-0* Inverter Switching
3 3
14-01 Switching Frequency
Select the inverter switching frequency. Changing the switching
frequency can help to reduce acoustic noise from the
compressor.
Option:
[0] Ran3
[1] Ran5
[2] 2.0 kHz
[3] 3.0 kHz
[4] 4.0 kHz
[5] 5.0 kHz
[6] 6.0 kHz
[7] 8.0 kHz
[8] 10.0 kHz
[9] 12.0 kHz
[10] 16.0 kHz
14-03 Overmodulation
Option:
[0] Off
[1] On
*
54
®
VLT Compressor Drive CDS 803
Function:
NOTICE
The output frequency value of
the frequency converter must
never exceed 1/10 of the
switching frequency. When the
compressor runs, adjust the
switching frequency in
parameter 14-01 Switching
Frequency until the compressor
is as noiseless as possible.
NOTICE
High switching frequencies
heat the frequency converter
and may reduce its lifetime.
NOTICE
Not all options are available in
all power sizes.
3 kHz true random PWM (white
noise modulation).
5 kHz true random PWM (white
noise modulation).
Function:
Selects no overmodulation of the
output voltage to avoid torque
ripple on the compressor shaft.
The overmodulation function
generates an extra voltage of up to
8% of U output voltage without
max
overmodulation, which results in an
Danfoss A/S © 06/2019 All rights reserved.
14-03 Overmodulation
Option: Function:
extra torque of 10–12% in the
middle of the oversynchronous
range (from 0% at nominal speed
rising to approximately 12% at
double nominal speed).
3.10.2 14-1* Mains On/Off
Parameters for configuring mains failure monitoring and
handling.
14-10 Mains Failure
Select what the frequency converter does when the mains
voltage drops below the limit set in parameter .
Option: Function:
[0] No function
*
[3] Coasting
14-11 Mains Fault Voltage Level
Range: Function:
Size [100 - 800 V] This parameter defines the
related threshold voltage at which the
*
selected function in
parameter 14-10 Mains Failure
should be activated. The detection
level is at a factor sqrt(2) of the
value in this parameter.
14-12 Response to Mains Imbalance
Operation under severe mains imbalance conditions reduces the
lifetime of the compressor. If the compressor is operated contin-
uously near nominal load, conditions are considered severe.
When a severe mains imbalance is detected, select one of the
available functions.
Option: Function:
[0] Trip Trips the frequency converter.
[1] Warning Issues a warning.
*
[2] Disabled No action.
May cause reduced life time.
[3] Derate Derates the load by mains
imbalance.
CAUTION
MG18P202