Danfoss VLT HVAC Basic Drive FC 101 Programming Manual page 31

Parameters
1-63 Slip Compensation Time Constant
Range: Function:
0.1 s [ 0.05 - Enter the slip compensation reaction speed. A
*
5.00 s] 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 - Enter the resonance dampening value. Set
*
500 %] 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:
0.005 s [ 0.001 - Set 1-64 Resonance Dampening and
*
0.05 s] 1-65 Resonance Dampening Time Constant
to help eliminate high-frequency
resonance problems. Enter the time
constant that provides the best
dampening.
1-66 Min. Current at Low Speed
Range: Function:
50 % [ 0 - 120 Applies to PM motors only. Increasing the
*
%] minimum current improves motor torque at
low speed, but also reduces efficiency.
1-71 Start Delay
Range: Function:
0 s [0 - 10 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 energised with 2-00 DC Hold/
time Motor Preheat Current during start delay
time.
[2] Coast/delay Inverter is coasted during start delay time
*
time (inverter off).
1-73 Flying Start
Option: Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
Flying start searches in clockwise direction only. If
not successful, a DC brake is activated. If PM motor
is selected, Parking is carried out if the speed is
®
VLT HVAC Basic Drive FC 101 Programming Guide
1-73 Flying Start
Option:
[0] Disabled Select [0] Disable if this function is not required
[1] Enabled Select [1] Enable to enable the frequency converter
The flying start function used for PM motors is based on
an initial speed estimation. The speed is always 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, the parking function is engaged (see
2-06 Parking Current and 2-07 Parking Time). Otherwise, the
frequency converter catches the motor at that speed and
resumes normal operation.
Current limitations of the flystart principle used for PM
motors:
•
•
1-80 Function at Stop
Option:
[0] Coast
*
[1] DC hold /
Motor
Preheat
MG18B302 - Rev. 2013-09-02
Function:
below 2.5%-5%, in the time set in 2-07 Parking
Time.
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 Parking Current
•
2-07 Parking Time
The speed range is up to 100% Nominal Speed or
the field weakening speed (which ever is lowest).
For high inertia applications (i.e. where the load
inertia is more than 30 times larger than the
motor inertia).
Function:
Select the drive function after a stop command
or after the speed is ramped down to the
settings in 1-82 Min Speed for Function at Stop
[Hz]. Function at Stop.
Available selections depend on 1-10 Motor
Construction:
[0] Asynchron:
[0] coast
[1] DC-hold
[1] PM non salient:
[0] coast
Leaves motor in free mode.
Energises motor with a DC holding current (see
2-00 DC Hold/Motor Preheat Current).
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