Factory Programmed U/F Characteristics; Control Accuracy - Danfoss VLT 3000 Series Product Manual

Factory programmed
U/f characteristics

Control accuracy

10
Technology
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).
Depending on the type of load, the
3000 Series has dynamic adapting or
VLT ®

factory programmed U/f characteristics

(motor voltage/frequency) giving the
correct magnetisation of the motor, thus
ensuring optimum dynamic, accuracy or
efficiency.
Constant torque CT
(Parameter 100)
Quadratic torque VT
(Parameter 100)
1: VT low
2: VT medium
3: VT high
Slip-compensated
(depending on motor size)
PID (closed loop)
Open loop (digital)
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
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.
®
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.
±0.5%
5-50 Hz: VLT ® 3011-3052
10-50 Hz: VLT ® 3004-3008
±1.0%
5-50 Hz: VLT ® 3004-3052 (10-140% load change)
±0.1%
5-50 Hz: (−140 - +140% load change)
±0.01%
0.5-120 Hz
(frequency stability)
0.5-500 Hz
±0.05%
Frequency resolution (digital)
(10-90% load change)