10 MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
The VLT
®
3000 Series is delivered with a
number of standard components which
you would normally have to buy separately
such as motor coils, mains reactor DC link
coil and galvanic insulation (PELV).
These components built-in as standard
give you the following advantages:
• Save space and reduce costs
• Simplify the installation as the
VLT
®
3000 will meet most demands.
Factory programmed
U/f characteristics
Technology
Depending on the type of load, the
VLT
®
3000 Series has dynamic adapting or
factory programmed U/f characteristics
(motor voltage/frequency) giving the
correct magnetisation of the motor, thus
ensuring optimum dynamic, accuracy or
efficiency.
It is possible to choose between 3 U/f
characteristics for VT operation, offering
the choice of optimising the start torque or
reducing the noise level or power losses
from the motor. A new parameter (106)
called “Automatic motor tuning” optimizes
the motor parameters at constant load
torque.
Constant torque CT
(Parameter 100)
1: VT low
2: VT medium
3: VT high
Quadratic torque VT
(Parameter 100)
Control accuracy
Slip-compensated ±0.5% 5-50 Hz: VLT
®
3011-3052
(depending on motor size) 10-50 Hz: VLT
®
3004-3008
±1.0% 5-50 Hz: VLT
®
3004-3052 (10-140% load change)
PID (closed loop) ±0.1% 5-50 Hz: (−140 - +140% load change)
Open loop (digital) ±0.01% 0.5-120 Hz
0.5-500 Hz
±0.05% Frequency resolution (digital)
(10-90% load change)
(frequency stability)
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