Danfoss VLT Micro Drive FC 51 Programming Manual page 17

Parameter Descriptions
VLT
1-52 Min. Speed Normal Magnetizing [Hz]
Range: Function:
Use this parameter along with 1-50 Motor
Magnetizing at Zero Speed.
0.0 Hz [0.0-10.0 Hz] Set frequency required for normal
*
magnetizing current. If frequency is set
lower than motor slip frequency, 1-50
Motor Magnetizing at Zero Speed is
4 4
inactive.
Magn. current
100%
Par.1-50
Par.1-51 Hz
Par.1-52 RPM
Illustration 4.2
1-55 U/f Characteristic - U
Range: Function:
This parameter is an array parameter [0-5]
and is only functional when 1-01 Motor
Control Principle is set to [0] U/f.
0.0 V [0.0-999.9 V] Enter voltage at each frequency point to
*
manually form a U/f characteristic
matching motor. Frequency points are
defined in 1-56 U/f characteristics - F.
1-56 U/f Characteristic - F
Range: Function:
This parameter is an array parameter [0-5]
and is only functional when 1-01 Motor
Control Principle is set to [0] U/f.
0.0 [0.0-1000.0 Enter frequency points to manually form a
Hz * Hz] U/f characteristic matching motor. Voltage
at each point is defined in 1-55 U/f
Characteristic - U.
Make a U/f characteristic based on 6
definable voltages and frequencies, see
Illustration 4.3.
Simplify U/f characteristics by merging 2
or more points (voltages and frequencies),
respectively, are set equal.
16 MG02C602 - VLT
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®
Micro Drive FC 51 Programming Guide
Motor Voltage
Par 1-55 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
1-55[1]
1-55[0]
1-56 1-56 1-56 1-56 1-56
[1]
[0] [2] [3] [4]
Output Frequency
Par 1-56 [x]
Illustration 4.3 U/f Characteristics
NOTE
For 1-56 U/f characteristics - F the following applies
[0] ≦ [1] ≦ [2] ≦ [3] ≦ [4] ≦ [5]
4.2.4 1-6* Load Dependent Setting
Parameters for adjusting the load-dependent motor
settings.
1-60 Low Speed Load Compensation
Range: Function:
Use this parameter to gain optimum U/f
characteristic when running at low speed.
100 % [0-199 %] Enter percentage in relation to load when
*
motor runs at low speed.
Change-over point is automatically
calculated based on motor size.
U
m
Par.1-60
100%
60%
0%
Changeover
Illustration 4.4
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is a registered Danfoss trademark
1-56
[5]
Par.1-61
f
out