Danfoss VLT HVAC Series User Manual

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

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage