VLT
®
4000 VT
All about VLT 4000
VT
MCM:
Stands for Mille Circular Mil, an American measuring
unit for cable cross-section.
MSB:
Most significant bit.
Used in serial communication.
n
M,N
The rated motor speed (nameplate data).
η
VLT
The efficiency of the VLT AFD is defined as the ratio
between the power output and the power input.
On-line/off-line parameters:
On-line parameters are activated immediately after the
data value is changed. Off-line parameters are not
activated until OK has been entered on the control unit.
PID:
The PID regulator maintains the desired speed
(press-ure, temperature, etc.) by adjusting the output
fre-quency to match the varying load.
P
M,N
The rated power delivered by the motor
(nameplate data).
Preset ref.
A permanently defined reference, which can be
set from -100% to +100% of the reference range.
There are four preset references, which can be
selected via the digital terminals.
Ref
MAX
The maximum value which the reference signal
may have. Set in parameter 205
Maximum
reference, Ref
MAX
.
Ref
MIN
The smallest value which the reference signal may
have. Set in parameter 204
Minimum reference, Ref
MIN
.
Setup:
There are four Setups, in which it is possible to
save parameter settings. It is possible to change
between the four parameter Setups and to edit one
Setup, while another Setup is active.
Start-disable command:
A stop command that belongs to group 1 of the
control commands - see this group.
Stop command:
See Control commands.
Thermistor:
A temperature-dependent resistor placed where the
temperature is to be monitored (VLT or motor).
Trip:
A state which occurs in different situations, e.g. if
the VLT AFD is subjected to an overtemperature.
A trip can be cancelled by pressing reset or,
in some cases, automatically.
Trip locked:
A state which occurs in different situations, e.g.
if the VLT AFD is subject to an overtemperature.
A locked trip can be cancelled by cutting off
line and restarting the VLT AFD.
U
M
The voltage transmitted to the motor.
U
M
,
The rated motor voltage (nameplate data).
U
VLT, MAX
The maximum output voltage.
VT characteristics:
Variable torque characteristics, used for
pumps and fans.
MG.40.A7.22 - VLT is a registered Danfoss trademark
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