![background image](http://html1.mh-extra.com/html/danfoss/vlt-micro-drive-fc-51-series/vlt-micro-drive-fc-51-series_programming-manual_3531631047.webp)
4.11 Parameter Group 14: Special Functions
4.11.1 14-** Special Functions
Parameter group for configuring special frequency
converter functions.
4.11.2 14-0* Inverter Switching
14-01 Switching Frequency
Option:
Function:
Select the switching frequency in order to
minimize e.g. acoustic noise and power loss or
maximizing efficiency.
[0]
2 KHz
[1]
*
4 KHz
[2]
8 KHz
[4]
16 KHz
NOTE
For 18.5 kW and 22 kW frequency converter, the option [4]
is not available.
14-03 Overmodulation
Option: Function:
This feature allows more accurate speed control near
and over nominal speed (50/60 Hz). Another
advantage with overmodulation is the ability of
staying at a constant speed even though main is
dropping.
[0]
Off Disables the overmodulation function to avoid torque
ripple on the motor shaft.
[1]
*
On Connects the overmodulation function to obtain an
output voltage up to 15% greater than mains voltage.
4.11.3 14-1* Mains Monitoring
This parameter group supplies functions for handling
imbalance on mains.
14-12 Functions at Mains Imbalance
Option:
Function:
Operation under severe mains imbalance
conditions reduces drive lift time.
Select function to take place when severe mains
imbalance is detected.
[0]
*
Trip
Frequency converter trips.
[1]
Warning Frequency converter issues a warning.
[2]
Disabled No action taken.
Parameters for configuring auto reset handling, special trip
handling and control card self test or initialisation.
14-20 Reset Mode
Option:
Function:
Select reset function after tripping. Once
reset, the frequency converter can be
restarted.
[0]
*
Manual Reset
Perform reset via [Reset] or digital inputs.
[1]
AutoReset 1
Performs one automatic reset after
tripping.
[2]
AutoReset 2
Performs two automatic resets after
tripping.
[3]
AutoReset 3
Performs three automatic resets after
tripping.
[4]
AutoReset 4
Performs four automatic resets after
tripping.
[5]
AutoReset 5
Performs five automatic resets after
tripping.
[6]
AutoReset 6
Performs six automatic resets after
tripping.
[7]
AutoReset 7
Performs seven automatic resets after
tripping.
[8]
AutoReset 8
Performs eight automatic resets after
tripping.
[9]
AutoReset 9
Performs nine automatic resets after
tripping.
[10] AutoReset 10
Performs ten automatic resets after
tripping.
[11] AutoReset 15
Performs fifteen automatic resets after
tripping.
[12] AutoReset 20
Performs twenty automatic resets after
tripping.
[13] Infinite auto
reset
Performs an infinite number of automatic
resets after tripping.
[14] Reset at
power-up
Trip-lock alarm can be reset at power up.
CAUTION
Motor may start without warning.
14-21 Automatic Restart Time
Range:
Function:
10 s
*
[0-600 s] Enter time interval from trip to start of
automatic reset function. This parameter is
active when
14-20 Reset Mode
, is set to
[1] to
[13] Automatic Reset
.
14-22 Operation Mode
Option:
Function:
Use this parameter for specifying normal
operation or to initialize all parameters,
except
15-03 Power Ups
,
15-04 Over Temps
and
15-05 Over Volts
.
[0]
*
Normal
Operation
Frequency converter runs normal operation.
[2]
Initialization
Resets all parameters to default settings,
except for
15-03 Power Ups
,
15-04 Over
Temps
and
15-05 Over Volts
. Frequency
converter resets during next power-up.
Parameter Descriptions
VLT
®
Micro Drive FC 51 Programming Guide
MG02C602 - VLT
®
is a registered Danfoss trademark
45
4
4