For VLT
®
AutomationDrive FC 361 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,
minimizing 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 4 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 smart logic controller evaluates the associated
user-defined events as true (
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 overvoltage 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 canceled by activating reset or, sometimes,
by being programmed to reset automatically. Do not use
trip for personal safety.
Trip lock
Trip lock is a state entered in fault situations when the
frequency converter is protecting itself and requiring
physical intervention. An example causing a trip lock is the
frequency converter being subject to a short circuit on the
output. A locked trip can only be canceled by cutting off
mains, removing the cause of the fault, and reconnecting
the frequency converter. Restart is prevented until the trip
state is canceled by activating reset or, sometimes, 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 361
6
Danfoss A/S © 03/2019 All rights reserved.
MG06J202
1
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Summary of Contents for VLT AutomationDrive FC 361
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