Danfoss VLT HVAC Basic Drive FC 100 Series Programming Manual page 39

Parameters
1-56 U/f Characteristic - F
Range: Function:
Size [ 0 - Enter frequency points to manually form a U/f
related 400.0 characteristic matching motor. Voltage at
*
Hz] each point is defined in 1-55 U/f Characteristic
- U.
Make a U/f characteristic based on 6 definable
voltages and frequencies, see figure below.
Simplify U/f characteristics by merging 2 or
more points (voltages and frequencies),
respectively, are set equal.
Figure 3.3
1-60 Low Speed Load Compensation
Range:
100 % [0 - 199 %]
*
1-61 High Speed Load Compensation
Range:
100 % [0 - 199 %]
*
1-62 Slip Compensation
Range:
0 % [ -400 - 399.0 %]
*
1-63 Slip Compensation Time Constant
Range: Function:
0.1 s [ 0.05 - 5.00 Enter the slip compensation reaction
*
s] 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.
1-66 Min. Current at Low Speed
Range:
50 % [ 0 - 120 %]
*
1-71 Start Delay
Range: Function:
0 s [0 - 10 s] This parameter enables a delay of the starting
*
time. The adjustable frequency drive begins
with the start function selected in 1-72 Start
®
VLT HVAC Basic Drive Programming Guide
1-71 Start Delay
Range:
1-72 Start Function
Option:
[0] DC Hold/delay
[2] Coast/delay time
1-73 Flying Start
Option:
[0] Disabled Select [0] Disable if this function is not required
Function:
[1] Enabled Select [1] Enable to enable the adjustable
Function:
Function:
The Flystart function used for PM motors is based on an
initial speed estimation. The speed will always be
estimated as the first thing after an active start signal is
given.
If the speed estimate comes out below 2.5%–5% of
nominal speed, then the Parking function will be engaged
(see 2-06 DC Brake Current and 2-07 DC Braking Time).
Otherwise, the adjustable frequency drive will catch the
Function:
motor at that speed and resume normal operation.
Current limitations of the Flystart Principle used for PM
motors:
®
MG18B222 - VLT is a registered Danfoss trademark
Function:
Function. Set the start delay time until
acceleration is to begin.
Function:
Motor is energized with 2-00 DC Hold/
time Motor Preheat Current during start delay
time.
Inverter is coasted during start delay time
(inverter off).
Function:
This function makes it possible to catch a motor
that is spinning freely due to a line drop-out.
Flying start will search in clockwise direction only.
If not successful, a DC brake will be activated. If PM
motor is selected, Parking will be carried out if the
speed is below 2.5%–5% of the time set in 2-07 DC
Braking Time.
frequency drive to "catch" and control a spinning
motor.
The parameter is always set to [1] Enable when
1-10 Motor Construction = [1] PM non-salient.
Important related parameters:
•
2-01 DC Brake Current
•
2-06 DC Brake Current
•
2-07 DC Braking Time
•
The speed range is up to 100% Nominal Speed or
the field weakening speed (which ever is lowest).
•
Limited to power size up to 30 hp [22 kW].
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