Power factor
The power factor is the relation between I
1
and I
RMS
.
Power factor =
3 x U x I
1
cosϕ1
3 x U x I
RMS
For FC 360 frequency converters,
cosϕ
1
= 1, therefore:
Power factor = I1 x cosϕ1
I
RMS
=
I
1
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
RMS
for the
same kW performance.
I
RMS
= I
1
2
+ I
5
2
+ I
7
2
+ .. + I
n
2
In addition, a high power factor indicates that the different
harmonic currents are low.
The built-in DC coils produce a high power factor,
minimising the imposed load on the mains supply.
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
Save parameter settings in 2 set-ups. Change between the
2 parameter set-ups and edit 1 set-up while another set-up
is active.
SFAVM
Acronym describing the switching pattern
stator flux-
oriented asynchronous vector modulation
.
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 smart logic controller (parameter group
13-**
Smart Logic Control
).
STW
Status word.
THD
Total harmonic distortion states the total contribution of
harmonic distortion.
Thermistor
A temperature-dependent resistor placed where the
temperature is monitored (frequency converter or motor).
Trip
A state entered in fault situations, for example, if the
frequency converter is subject to an overtemperature or
when it 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 lock
A state entered in fault situations when the frequency
converter is protecting itself and requiring physical
intervention, for example, 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. 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
+
) improves the dynamics and
stability, both when the speed reference is changed and in
relation to the load torque.
60
°
AVM
Refers to the switching pattern
60
°
asynchronous vector
modulation
.
Introduction
VLT
®
AutomationDrive FC 360
6
Danfoss A/S © 7/2015 All rights reserved.
MG06C602
1
1
