Load Depend. Setting; Start Adjustments - Danfoss VLT HVAC Basic Drive Programming Manual

Parameters
1-52 Min Speed Normal Magnetising [Hz]
Range: Function:
0.0 Hz [0.0 - 10.0 Set the required frequency for normal
*
Hz] magnetising current.
Use this parameter along with 1-50 Motor
Magnetisation at Zero Speed. See drawing
for 1-50 Motor Magnetisation at Zero
Speed.
1-55 U/f Characteristic - U
Range: Function:
Size related [0.0 - 999.0 V] Enter voltage at each frequency
*
point to manually form a U/f charac-
teristic matching motor. Frequency
points are defined in 1-56 U/f Charac-
teristic - F .
1-56 U/f Characteristic - F
Range: Function:
Size [0.0 - Enter frequency points to manually form a U/f
related 400.0 characteristic matching motor. Voltage at each
*
Hz] point is defined in 1-55 U/f Characteristic - U.
Make a U/f characteristic based on 6 definable
voltages and frequencies, see below figure.
Simplify U/f characteristics by merging 2 or
more points (voltages and frequencies), respec-
tively, are set equal.
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
[0]

3.2.6 1-6* Load Depend. Setting

1-62 Slip Compensation
Range: Function:
0 % [-400 - 399 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
1-63 Slip Compensation Time Constant
Range: Function:
0.1 s [0.05 - 5.0 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.
VLT HVAC Basic Drive Programming Guide
1-56
1-56 1-56 1-56 1-56
[5]
[1] [2] [3] [4]
Output Frequency
Par 1-56 [x]
.
M,N
®
MG.18.B1.02 - VLT is a registered Danfoss trademark
1-64 Resonance Dampening
Range: Function:
100.0 % [0.0 - 500.0 Enter the resonance dampening value. Set
*
%] 1-64 Resonance Dampening and
1-65 Resonance Dampening Time Constant
to help eliminate high-frequency
resonance problems. To reduce resonance
oscillation, increase the value of
1-64 Resonance Dampening.
1-65 Resonance Dampening Time Constant
Range: Function:
0.0050 % [0.0050 - 0.05 Set 1-64 Resonance Dampening and
*
%] 1-65 Resonance Dampening Time
Constant to help eliminate high-
frequency resonance problems. Enter
the time constant that provides the
best dampening.

3.2.7 1-7* Start Adjustments

1-71 Start Delay
Range: Function:
0.0 s [0.0 - 10.0 This parameter enables a delay of the starting
*
s] time. The frequency converter begins with the
start function selected in 1-72 Start Function.
Set the start delay time until acceleration is to
begin.
1-72 Start Function
Option: Function:
[0] DC Hold/delay Motor is energized with 2-00 DC Hold/
time Motor Preheat Current during start delay
time.
[2] Coast/delay time Inverter is coasted during start delay time
*
(inverter off).
1-73 Flying Start
Option: Function:
Select Enable [1] to enable the frequency converter
to catch a motor spinning due to mains drop-out.
Select Disable [0] if this function is not required.
When par. 1-73 is enabled par. 1-71 and 1-72 have
no function. Par 1-73 is active in VVC+ mode only.
[0] Disabled
*
[1] Enabled
3 3
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