Danfoss VLT Programming Manual page 42

Parameter Description
3.3.4 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range: Function:
100 [0 - Use this parameter along with 1-51 Min Speed
% 300 Normal Magnetising [RPM] to obtain a different
*
%] thermal load on the motor when running at low
speed.
Enter a value which is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
M ag n. cur r en t
100%
P ar .1-50
1-51 Min Speed Normal Magnetising [RPM]
Range: Function:
Size [10 - 300 Set the required speed for normal
related RPM] magnetising current. If the speed is set
*
lower than the motor slip speed,
1-50 Motor Magnetisation at Zero Speed
and 1-51 Min Speed Normal Magnetising
[RPM] are of no significance.
Use this parameter along with 1-50 Motor
Magnetisation at Zero Speed. See drawing
for 1-50 Motor Magnetisation at Zero
Speed.
1-52 Min Speed Normal Magnetising [Hz]
Range:
Size related [0.3 - 10.0 Hz]
*
1-58 Flystart Test Pulses Current
Range: Function:
30 % [0 - 200 Control the percentage of the magnetizing
*
%] current for the pulses used to detect the motor
direction. Reducing this value will reduce the
generated torque. 100% means nominal motor
current. The parameter is active when
1-73 Flying Start is enabled. This parameter is
only available in VVC
1-59 Flystart Test Pulses Frequency
Range: Function:
200 % [0 - 500 Control the percentage of the frequency for
*
%] the pulses used to detect the motor direction.
Increasing this value will reduce the generated
torque. 100% means 2 times the slip
frequency. The parameter is active when
1-73 Flying Start is enabled. This parameter is
only available in VVC
®
VLT HVAC Drive Programming Guide
P ar .1-51 Hz
P ar .1-52 R PM
Function:
plus .
plus .
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
3.3.5 1-6* Load Depend. Setting
1-60 Low Speed Load Compensation
Range: Function:
100 % [0 - 300 Enter the % value to compensate voltage in
*
%] relation to load when the motor is running at
low speed and obtain the optimum U/f charac-
teristic. The motor size determines the
frequency range within which this ameter is
active.
Motor size
0.25 kW - 7.5 kW
11 kW - 45 kW
55 kW - 550 kW
U
m
Par.1-60
100%
60%
0%
Changeover
1-61 High Speed Load Compensation
Range: Function:
100 % [0 - 300 Enter the % value to compensate voltage in
*
%] relation to load when the motor is running at
high speed and obtain the optimum U/f charac-
teristic. The motor size determines the
frequency range within which this ameter is
active.
Motor size
0.25 kW - 7.5 kW
11 kW - 45 kW
55 kW - 550 kW
1-62 Slip Compensation
Range: Function:
0 % [-500 - 500 Enter the % value for slip compensation, to
*
%] compensate for tolerances in the value of n
Slip compensation is calculated automatically,
i.e. on the basis of the rated motor speed
n .
M,N
3
Change over
< 10 Hz
< 5 Hz
< 3-4 Hz
Par.1-61
f
out
Change-over
> 10 Hz
< 5 Hz
< 3-4 Hz
.
M,N
41
3