Danfoss VLT HVAC Series Programming Manual page 49

VLT ® HVAC Drive Programming Guide
1-61 High Speed Load Compensation
Range:
100 %* [0 - 300 %]
1-62 Slip Compensation
Range:
0 %* [-500 - 500 %]
1-63 Slip Compensation Time Constant
Range:
0.10 s* [0.05 - 5.00 s]
1-64 Resonance Dampening
Range:
100 %* [0 - 500 %]
1-65 Resonance Dampening Time Constant
Range:
5 ms* [5 - 50 ms]
Function:
Enter the % value to compensate voltage in relation to load while the motor is running at high
speed, and obtain the optimum U/f characteristic. The motor size determines the frequency ranges
within which this parameter is active.
Motor size
0.3–10 hp [0.25–7.5 kW]
15–60 hp [11–45 kW]
75-738 hp [55-550 kW]
Function:
Enter the % value for slip compensation to compensate for tolerances in the value of n
compensation is calculated automatically, i.e., on the basis of the rated motor speed n
Function:
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 arise, use a longer time setting.
Function:
Enter the resonance dampening value. Set par.1-64
Dampening Time Constant
to help eliminate high-frequency resonance problems. To reduce reso-
nance oscillation, increase the value of par.1-64
Function:
Resonance Dampening
Set par.1-64
eliminate high-frequency resonance problems. Enter the time constant that provides the best damp-
ening.
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
3 Parameter Description
Change-over
> 10 Hz
< 5 Hz
< 3-4 Hz
Resonance Dampening
Resonance Dampening .
Resonance Dampening Time Constant
and par.1-65
3
. Slip
M,N
.
M,N
Resonance
and par.1-65
to help
3-25