Danfoss VLT HVAC Basic Drive FC 101 Programming Manual page 38

Parameters
3.2.7 1-5* Load Indep. Setting
Parameters for load-independent motor settings.
1-50 Motor Magnetisation at Zero Speed
Range:
3 3
100 [0 -
% 300 %
*
]
1-52 Min Speed Normal Magnetising [Hz]
Range:
1 Hz [0.1 - 10.0
*
Hz]
1-55 U/f Characteristic - U
Array [6]
Range:
Size related
*
V]
1-56 U/f Characteristic - F
Array[6]
Range:
Size [ 0 -
related 400.0
*
Hz]
36
Function:
Use this parameter along with parameter 1-52 Min
Speed Normal Magnetising [Hz] to obtain a
different thermal load on the motor when running
at low speed.
Enter a value that is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
Magn. current
90%
Par.1-50
Par.1-52
Illustration 3.2 Motor Magnetization
Function:
Set the required frequency for normal
magnetizing current.
Use this parameter along with
parameter 1-50 Motor Magnetisation at Zero
Speed. See Illustration 3.2.
Function:
[0 - 999 Enter voltage at each frequency point
to form a U/f characteristic matching
the motor. Frequency points are
defined in parameter 1-56 U/f Charac-
teristic - F.
Function:
Enter frequency points to form a U/f charac-
teristic matching the motor. Voltage at each
point is defined in parameter 1-55 U/f Charac-
teristic - U.
Make a U/f characteristic based on 6 definable
voltages and frequencies, see Illustration 3.3.
Simplify U/f characteristics by merging 2 or
more points (voltages and frequencies). Set
the points at equal values.
Danfoss A/S © 04/2018 All rights reserved.
®
VLT HVAC Basic Drive FC 101
1-56 U/f Characteristic - F
Array[6]
Range:
3.2.8 1-6* Load Depen. Setting
Hz
Parameters for adjusting the load-dependent motor
settings.
1-62 Slip Compensation
Range:
Size
related
*
1-63 Slip Compensation Time Constant
Range:
0.1 s
*
1-64 Resonance Dampening
Range:
100
%
*
1-65 Resonance Dampening Time Constant
Range:
0.005 s
*
Function:
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
[0] [1] [2]
Illustration 3.3 U/f Characteristic
Function:
[-400 - Enter the % value for slip compensation
400 %] to compensate for tolerances in the
value of n . Slip compensation is
M,N
calculated automatically, which is based
on the nominal motor speed n
Function:
[0.05 - 5 s] Enter the slip compensation reaction speed.
A high value results in slow reaction, and a
low value results in quick reaction. If low-
frequency resonance problems occur, use a
longer time setting.
Function:
[0 - Enter the resonance damping value. Set
500 %] parameter 1-64 Resonance Dampening and
parameter 1-65 Resonance Dampening Time
Constant to help eliminate high-frequency
resonance problems. To reduce resonance
oscillation, increase the value of
parameter 1-64 Resonance Dampening.
Function:
[0.001 - Set parameter 1-64 Resonance Dampening
0.050 s] and parameter 1-65 Resonance Dampening
Time Constant to help eliminate high-
frequency resonance problems. Enter the
time constant that provides the best
dampening.
1-56
1-56 1-56
[5]
[3] [4]
Output Frequency
Par 1-56 [x]
.
M,N
MG18B502