Pulse Input/Incremental Encoder
An external, digital pulse transmitter used for feeding back information on motor speed. The encoder is
used in applications where great accuracy in speed control is required.
RCD
Residual Current Device.
Set-up
You can save parameter settings in four Set-ups. Change between the four parameter Set-ups and edit
one Set-up, while another Set-up is active.
SFAVM
Switching pattern called Stator Flux oriented Asynchronous Vector Modulation (par. 14-00).
Slip Compensation
The frequency converter compensates for the motor slip by giving the frequency a supplement that fol-
lows 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. (Parameter group 13-xx).
Thermistor :
A temperature-dependent resistor placed where the temperature is to be monitored (frequency converter
or motor).
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.
VVCplus
If compared with standard voltage/frequency ratio control, Voltage Vector Control (VVCplus) improves the
dynamics 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 (par. 14-00).
Power Factor
The power factor is the relation between I1and
IRMS.
Power factor
=3
xU xI
1
xcos
ϕ
3
xU xI
RMS
The power factor for 3-phase control:
=
I
1
xcos
ϕ1
I
RMS
=
I
1
I
RMS
since cos
ϕ1=1
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 IRMS for
the same kW performance.
FC 300 Design Guide
How to Read this Design Guide
10 MG.33.B7.02 - VLT is a registered Danfoss trademark
