Danfoss VLT Decentral Drive FCD 302 Design Manual page 8

Introduction
to 3 metres from the frequency converter, i.e. in a front
panel, using the installation kit option.
lsb
Least significant bit.
msb
Most significant bit.
MCM
Short for Mille Circular Mil, an American unit for measuring
cable cross-section. 1 MCM=0.5067 mm
On-line/Off-line Parameters
Changes to on-line parameters are activated immediately
after the data value is changed. Changes to off-line
parameters are activated upon entering [Ok] on the LCP.
Process PID
The PID regulator maintains the desired speed, pressure,
temperature, and so on, by adjusting the output frequency
to match the varying load.
PCD
Process Data
Pulse Input/Incremental Encoder
An external digital sensor used for feedback information of
motor speed and direction. Encoders are used for high
speed accuracy feedback and in high dynamic applications.
The encoder connection is either via term 32 and 32 or
encoder option MCB 102.
RCD
Residual Current Device.
Set-up
It is possible to save parameter settings in four set-ups.
Switch 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 (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 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:
®
VLT Decentral Drive FCD 302
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
2
.
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.
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).
Power Factor
The power factor is the relation between I
Power factor =
The power factor for 3-phase control:
I 1 x cos ϕ1
=
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 RMS =
In addition, a high power factor indicates that the different
harmonic currents are low.
®
MG04H102 - VLT is a registered Danfoss trademark
plus
plus ) improves the dynamics
x U x I 1 cos ϕ
3
3 x U x I RMS
I 1
since cos ϕ1 = 1
=
I RMS I RMS
I 1 2 + I 5 2 + I 7 2 + .. + I n 2
1
and I .
1 RMS
for the
RMS
7
1