Parameters: 14-** Special Functions - Danfoss VLT Refrigeration Drive FC 103 Programming Manual

Parameter Description

3.12 Parameters: 14-** Special Functions

Parameter group for configuring special frequency
converter functions.
3.12.1 14-0* Inverter Switching
3 3
14-00 Switching Pattern
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 oversyncronous
106
VLT
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 © 05/2016 All rights reserved.
®
Refrigeration Drive FC 103
14-03 Overmodulation
Option: Function:
range (from 0% at nominal speed, rising to approxi-
mately 12% at double nominal speed).
14-04 PWM Random
Option:
[0] Off No change of the acoustic motor switching noise.
*
[1] On Select to reduce the acoustic noise from the motor.
3.12.2 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
Illustration 3.37 Controlled Ramp Down - Short Mains Failure
Function:
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 1 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
drive 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 inverter turns off and the capacitor bank
backs up the control card. Backing up control
card ensures a faster restart when mains is
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.
DC Voltage
Output Speed rpm
Over Voltage Control Level
Par 14-11
Time
Mains
MG16H202