Danfoss FC 300 Design Manual page 139

FC 300 Design Guide
Description of choice:
1-61 High Speed Load Compensation
Value:
0 - 300%
Function:
Enter the % value to compensate voltage in rela-
tion to load when the motor is running at high
speed and obtain the optimum U/f characteristic.
The motor size determines the frequency range
within which this parameter is active.
Motor size
0.25 kW - 7.5 kW
1-62 Slip Compensation
Value:
-500 - 500 %
Function:
Enter the % value for slip compensation, to com-
pensate for tolerances in the value of n
compensation is calculated automatically, i.e. on
the basis of the rated motor speed n
This function is not active when par. 1-00 Config-
uration Mode is set to Speed closed loop [1] or
Torque [2] Torque control with speed feedback or
when par. 1-01 Motor Control Principle is set to U/
f [0] special motor mode.
1-63 Slip Compensation Time Constant
Value:
0.05 - 5.00 s
Function:
Enter the slip compensation reaction speed. A
high value results in slow reaction, and a low val-
factory setting
How to Programme
100%
Change-over
> 10 Hz
100%
. Slip
M,N
.
M,N
0.10s
() display text []
MG.33.B7.02 - VLT is a registered Danfoss trademark
ue results in quick reaction. If low-frequency res-
onance problems arise, use a longer time setting.
1-64 Resonance Dampening
Value:
0 - 500 %
Function:
Enter the resonance dampening value. Set par.
1-64 and par. 1-65 Resonance Dampening Time
Constant to help eliminate high-frequency reso-
nance problems. To reduce resonance oscillation,
increase the value of par. 1-64.
Resonance Dampening Time Con-
1-65
stant
Value:
5 - 50 msec.
Function:
Set par. 1-64 Resonance Dampening and par.
1-65 to help eliminate high-frequency resonance
problems. Enter the time constant that provides
the best dampening.
1-66 Min. Current at Low Speed
Value:
0 - 200%
Function:
Enter the minimum motor current at low speed,
see par. 1-53 Model Shift Frequency. Increasing
this current improves motor torque at low speed.
Par. 1-66 is enabled when par. 1-00 Configuration
Mode = Speed open loop [0] only. The drive runs
with constant current through motor for speeds
below 10 Hz.
For speeds above 10 Hz, the motor flux model in
the drive controls the motor. Par. 4-16 Torque
Limit Motor Mode and / or par. 4-17 Torque Limit
Generator Mode automatically adjust par. 1-66.
The parameter with the highest value adjusts par.
1-66. The current setting in par. 1-66 is composed
of the torque generating current and the magnet-
izing current.
Example: Set par. 4-16 Torque Limit for Motor
Mode to 100% and set par. 4-17 Torque Limit for
Generating Mode to 60%. Par. 1-66 automatically
value for use in communication via serial communication port
100%
5 msec.
100%
139