Danfoss VLT AQUA Drive FC 202 Design Manual page 12

How to Read this Design Gui...
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Set-up
Save parameter settings in 4 set-ups. Change between the
4 parameter set-ups and edit one set-up, while another
set-up is active.
SFAVM
Switching pattern called Stator Flux oriented Asynchronous
Vector Modulation (14-00 Switching Pattern).
Slip Compensation
The frequency converter compensates for the motor slip
by giving the frequency a supplement that follows the
measured motor load keeping the motor speed almost
constant.
Smart Logic Control (SLC)
The SLC is a sequence of user-defined actions executed
when the associated user-defined events are evaluated as
true by the SLC.
Thermistor
A temperature-dependent resistor placed where the
temperature is monitored (frequency converter or motor).
Trip
A state entered in fault situations, for example, the
frequency converter is subject to an over-temperature or
when the frequency converter is protecting the motor
process or mechanism. Restart is prevented until the cause
of the fault has disappeared and the trip state is cancelled
by activating reset or, in some cases, by being
programmed to reset automatically. Do not use trip for
personal safety.
Trip Locked
A state entered in fault situations when the frequency
converter is protecting itself and requiring physical
intervention, for example, the frequency converter is
subject to a short circuit on the output. A locked trip can
only be cancelled by cutting off mains, removing the cause
of the fault, and reconnecting the frequency converter.
Restart is prevented until the trip state is cancelled by
activating reset or, in some cases, by being programmed
to reset automatically. Do not use trip lock for personal
safety.
VT Characteristics
Variable torque characteristics used for pumps and fans.
VVC +
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVC
the stability, both when the speed reference is changed
and in relation to the load torque.
60° AVM
Switching pattern called 60° Asynchronous Vector
Modulation (14-00 Switching Pattern).
10
Design Guide
+
) improves the dynamics and
Danfoss A/S © Rev. 06/2014 All rights reserved.
1.1.5 Power Factor
The power factor is the relation between I
U × I 1 × COS ϕ
3 ×
Power factor =
3 × U × IRMS
The power factor for 3-phase control:
I cos ϕ1 I
×
1 1
= = since cos ϕ1 = 1
I I
RMS RMS
The power factor indicates to which extent the frequency
converter imposes a load on the mains supply.
The lower the power factor, the higher the I
same kW performance.
I 1 2 I 5 2 I 7 2 I n 2
IRMS
= + + +. . +
In addition, a high power factor indicates that the different
harmonic currents are low.
The built-in DC coils produce a high power factor, which
reduces the imposed load on the mains supply.
and I .
1 RMS
for the
RMS
MG20Z202