Danfoss VLT AutomationDrive Design Manual page 11

How to Read this Design Gui...
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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 Smart Logic Controller. (Par. group 13-** Smart
Logic Control (SLC).
STW
Status Word
FC Standard Bus
Includes RS -485 bus with FC protocol or MC protocol. See
8-30 Protocol.
Thermistor:
A temperature-dependent resistor placed where the
temperature is to be monitored (frequency converter or
motor).
THD
Total Harmonic Distortion state the total contribution of
harmonic.
Trip
A state entered in fault situations, e.g. if 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. Trip may not be used for personal
safety.
Trip Locked
A state entered in fault situations when the frequency
converter is protecting itself and requiring physical
intervention, e.g. if 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. Trip may not be used for personal safety.
VT Characteristics
Variable torque characteristics used for pumps and fans.
plus
VVC
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVC
and 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
FC 300 Design Guide
plus
) improves the dynamics
®
MG.33.BD.02 - VLT
Power Factor
The power factor is the relation between I
x U x I 1 cos ϕ
3
Power factor =
3 x U x I RMS
The power factor for 3-phase control:
I 1
I 1 x cos ϕ1
since cos ϕ1 = 1
= =
I RMS I 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
I RMS =
In addition, a high power factor indicates that the different
harmonic currents are low.
All Danfoss frequency converters have built-in DC coils in
the DC link to have a high power factor and to reduce the
THD on the main supply.
is a registered Danfoss trademark
and I .
1 RMS
for the
RMS