3.10 Main Menu - Special Functions - Group
14
3.10.1 14-0* Inverter Switching
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
adjustable frequency drive 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.
NOTE!
Not all choices are available in all power
sizes.
[0]
Ran3
3kHz true random PWM (white noise modulation)
[1]
Ran5
5kHz true random PWM (white noise modulation)
[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]
12.0kHz
[10] 16.0kHz
14-03 Overmodulation
Option: Function:
[0] Off Selects no overmodulation of the output voltage in
order to avoid torque ripple on the motor shaft.
[1] On The overmodulation function generates an extra voltage
of up to 8% of U
max
output voltage without overmodu-
lation, which results in an extra torque of 10–12% in the
middle of the oversyncronous range (from 0% at
nominal speed rising to approximately 12% at double
nominal speed).
14-08 Damping Gain Factor
Range:
Function:
96 %
*
[0 - 100 %]
3.10.2 14-1* >Mains Power On/Off
Parameters for configuring line failure monitoring and
handling.
14-12 Function at Mains Imbalance
Option:
Function:
Operating under severe line imbalance conditions
reduces the lifetime of the motor. Conditions are
considered severe if the motor operates contin-
uously near nominal load (such as when a pump or
fan runs near full speed).
When a severe line imbalance is detected:
[0] Trip
Trips the adjustable frequency drive.
[1] Warning Issues a warning.
[2] Disabled No action.
CAUTION
May cause reduced lifetime.
3.10.3 14-2* Trip Reset
14-20 Reset Mode
Option:
Function:
Select the reset function after
tripping. Once reset, the adjustable
frequency drive can be restarted.
[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
[3]
Automatic reset x 3
[4]
Automatic reset x 4
[5]
Automatic reset x 5
[6]
Automatic reset x 6
[7]
Automatic reset x 7
[8]
Automatic reset x 8
[9]
Automatic reset x 9
[10] Automatic reset x 10
[11] Automatic reset x 15
[12] Automatic reset x 20
[13] Infinite auto reset
Select
[13] Infinite Automatic Reset
for
continuous resetting after tripping.
Parameters
VLT
®
HVAC Basic Drive Programming Guide
MG18B222 - VLT
®
is a registered Danfoss trademark
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