Danfoss VLT Programming Manual page 8

Introduction
U
M
Instantaneous motor voltage.
U
M,N
Rated motor voltage (nameplate data).
Break-away torque
Torque
η
VLT
The efficiency of the frequency converter is defined as the
ratio between the power output and the power input.
Start-disable command
A stop command belonging to the group 1 control
commands - see this group.
Stop command
See Control commands.
References:
Analog Reference
A signal transmitted to the analog inputs 53 or 54, can be
voltage or current.
Binary Reference
A signal transmitted to the serial communication port.
Preset Reference
A defined preset reference to be set from -100% to +100% of
the reference range. Selection of eight preset references via
the digital terminals.
Pulse Reference
A pulse frequency signal transmitted to the digital inputs
(terminal 29 or 33).
Ref
MAX
Determines the relationship between the reference input at
100% full scale value (typically 10V, 20mA) and the resulting
reference. The maximum reference value set in
3-03 Maximum Reference.
®
VLT HVAC Drive Programming Guide
Pull-out
rpm
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
Ref
MIN
Determines the relationship between the reference input at
0% value (typically 0V, 0mA, 4mA) and the resulting
reference. The minimum reference value set in 3-02 Minimum
Reference.
Miscellaneous:
Analog Inputs
The analog inputs are used for controlling various functions
of the frequency converter.
There are two types of analog inputs:
Current input, 0-20 mA and 4-20 mA
Voltage input, 0-10 V DC ()
Voltage input, -10 - +10 V DC ().
Analog Outputs
The analog outputs can supply a signal of 0-20 mA, 4-20 mA.
Automatic Motor Adaptation, AMA
AMA algorithm determines the electrical parameters for the
connected motor at standstill.
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.
Digital Inputs
The digital inputs can be used for controlling various
functions of the frequency converter.
Digital Outputs
The frequency converter features two Solid State outputs
that can supply a 24 V DC (max. 40 mA) signal.
DSP
Digital Signal Processor.
ETR
Electronic Thermal Relay is a thermal load calculation based
on present load and time. Its purpose is to estimate the
motor temperature.
®
Hiperface
®
Hiperface is a registered trademark by Stegmann.
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.
LCP
The Local Control Panel makes up a complete interface for
control and programming of the frequency converter. The
control panel is detachable and can be installed up to 3
1 1
7