Definitions - Danfoss VLT AQUA Drive FC 202 Design Manual

Introduction
1 1
Conventions
Numbered lists indicate procedures.
Bullet lists indicate other information and descriptions of
figures.
Italicized text indicates:
•
Cross reference
•
Link
•
Footnote
•
Parameter name, parameter group name,
parameter option
All dimensions are in inch (mm).
* indicates a default setting of a parameter.
The following symbols are used in this document:
WARNING
Indicates a potentially hazardous situation that could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that could
result in minor or moderate injury. It can also be used to
alert against unsafe practices.
NOTICE!
Indicates important information, including situations that
can result in damage to equipment or property.

1.5 Definitions

Brake resistor
The brake resistor is a module capable of absorbing the
braking energy generated in regenerative braking. This
regenerative braking energy increases the intermediate
circuit voltage and a brake chopper ensures that the power
is transmitted to the brake resistor.
Coast
The motor shaft is in free mode. No torque on the motor.
CT characteristics
Constant torque characteristics used for all applications
such as conveyor belts, displacement pumps and cranes.
Initializing
If initialization is carried out (14-22 Operation Mode), the
adjustable frequency drive 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.
10
®
VLT AQUA Drive FC 202
Power factor
The true power factor (lambda) takes all the harmonics
into consideration and is always smaller than the power
factor (cosphi) that only considers the 1st harmonics of
current and voltage.
cosϕ =
Cos-phi is also known as displacement power factor.
Both lambda and cos phi are stated for Danfoss VLT
adjustable frequency drives in chapter 7.2 Line Power
Supply.
The power factor indicates to which extent the adjustable
frequency drive imposes a load on the line power supply.
The lower the power factor, the higher the I
same kW performance.
In addition, a high power factor indicates that the
harmonic currents are low.
All Danfoss adjustable frequency drives have built-in DC
coils in the DC link to have a high power factor and reduce
the THD on the main supply.
Set-up
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.
Slip compensation
The adjustable frequency drive 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 SLC. (Parameter group 13-** Smart Logic).
FC Standard bus
Includes RS485 bus with FC protocol or MC protocol. See
8-30 Protocol.
Thermistor
A temperature-dependent resistor placed where the
temperature is to be monitored (adjustable frequency drive
or motor).
Trip
A state entered in fault situations, such as when the
adjustable frequency drive is subject to an overtem-
perature or when it protects the motor, process or
mechanism. Restart is prevented until the cause of the
fault has disappeared and the trip state is cancelled. Cancel
the trip state by:
•
•
Danfoss A/S © 09/2014 All rights reserved.
Uλ x Iλ x cosϕ
P kW
=
P kVA Uλ x Iλ
activating reset or
programming the adjustable frequency drive to
reset automatically
®
for the
RMS
MG20N622