Conventions
Numbered lists indicate procedures.
Bullet lists indicate other information and description of
illustrations.
Italicised text indicates:
•
Cross reference.
•
Link.
•
Footnote.
•
Parameter name, parameter group name,
parameter option.
All dimensions are in mm (inch).
* indicates a default setting of a parameter.
1.5 Safety Symbols
The following symbols are used in this manual:
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.
1.6 Definitions
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.
•
Cranes.
Initialising
If initialising is carried out (
parameter 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.
Power factor
The true power factor (lambda) considers all the
harmonics. The true power factor is always smaller than
the power factor (cosphi) that only considers the 1st
harmonics of current and voltage.
cosϕ = P kW
P kVA =
Uλ x Iλ x cosϕ
Uλ x Iλ
Cosphi is also known as displacement power factor.
Both lambda and cosphi are stated for Danfoss VLT
®
frequency converters in
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.
In addition, a high power factor indicates that the
harmonic currents are low.
All Danfoss frequency converters have built-in DC coils in
the DC link. The coils ensure a high power factor and
reduce the THDi on the main supply.
Set-up
Save parameter settings in 4 set-ups. Change between the
4 parameter set-ups and edit 1 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 SLC. (Parameter group
13-** Smart Logic
).
FC standard bus
Includes RS485 bus with FC protocol or MC protocol. See
parameter 8-30 Protocol
.
Thermistor
A temperature-dependent resistor placed where the
temperature is to be monitored (frequency converter or
motor).
Trip
A state entered in fault situations, such as when the
frequency converter is subject to an overtemperature 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:
•
Activating reset, or
•
Programming the frequency converter to reset
automatically
Do not use trip for personal safety.
Introduction
Design Guide
MG16G202
Danfoss A/S © 08/2015 All rights reserved.
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