η
VLT
Efficiency of the frequency converter defined
as ratio between power output and power
input
nF
Nanofarad
NLCP
Numerical Local Control Panel
Nm
Newton Meters
n
s
Synchronous Motor Speed
On-line/Off-line
Parameters
Changes to on-line parameters are activated
immediately after the data value is changed
P
br,cont.
Rated power of the brake resistor (average
power during continuous braking)
PCB
Printed Circuit Board
PCD
Process Data
PELV
Protective Extra Low Voltage
P
m
Frequency converter nominal output power as
HO
P
M,N
Nominal motor power
PM motor
Permanent Magnet motor
Process PID
The PID regulator maintains the desired speed,
pressure, temperature, etc.
R
br,nom
The nominal resistor value that ensures a
brake power on motor shaft of 150/160% for 1
minute
RCD
Residual Current Device
Regen
Regenerative terminals
R
min
Minimum permissible brake resistor value by
frequency converter
RMS
Root Mean Square
RPM
Revolutions Per Minute
R
rec
Resistor value and resistance of the brake
resistor
s
Second
SFAVM
Stator Flux oriented Asynchronous Vector
Modulation
STW
Status Word
SMPS
Switch Mode Power Supply
THD
Total Harmonic Distortion
T
LIM
Torque limit
TTL
TTL encoder (5 V) pulses - Transistor Transistor
Logic
U
M,N
Nominal motor voltage
V
Volts
VT
Variable Torque
VVC
+
Voltage Vector Control
Table 1.1 Abbreviations
The following symbols are used in this document:
WARNING
Indicates a potentially hazardous situation which could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which could
result in minor or moderate injury. It may also be used
to alert against unsafe practices.
NOTICE
Indicates important information, including situations that
may result in damage to equipment or property.
1.4 Definitions
Coast
The motor shaft is in free mode. No torque on motor.
Brake Resistor
The brake resistor is a module capable of absorbing the
brake power generated in regenerative braking. This
regenerative braking power increases the intermediate
circuit voltage and a brake chopper ensures that the
power is transmitted to the brake resistor.
CT Characteristics
Constant torque characteristics used for all applications
such as conveyor belts, displacement pumps and cranes.
Initialising
If initialising is carried out (
14-22 Operation Mode
), the
frequency converter returns to the default setting.
Intermittent Duty Cycle
An intermittent duty rating refers to a sequence of duty
cycles. Each cycle consists of an on-load and an off-load
period. The operation can be either periodic duty or non-
periodic duty.
Set-up
Save parameter settings in 4 set-ups. Change between the
4 parameter set-ups and edit one set-up, while another
set-up is active.
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
.
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).
Introduction
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
MG33BF02 - Rev. 2013-12-20
9
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