Danfoss VLT AQUA Drive FC 200 Programming Manual page 47

Parameter Description
1-65 Resonance Dampening Time Constant
Range:
5 ms [5 - 50 ms] Set 1-64 Resonance Dampening and
*
3 3
NOTE
1-65 Resonance Dampening Time Constant will not have
effect when 1-10 Motor Construction = [1] PM, non salient
SPM.
1-66 Min. Current at Low Speed
Range:
Size related
*
%]
NOTE
1-66 Min. Current at Low Speed will not have affect if
1-10 Motor Construction=[0]
3.3.8 1-7* Start Adjustments
1-70 PM Start Mode
Option:
[0] Rotor
Detection
[1] Parking
1-71 Start Delay
Range:
0.0 s [0.0 - 300.0 s] The function selected in 1-80 Function at
*
46
Function:
1-65 Resonance Dampening Time Constant to
help eliminate high-frequency resonance
problems. Enter the time constant that
provides the best dampening.
Function:
[ 1. - 200. Enter the minimum motor current at
low speed.
Increasing this current improves
developed motor torque at low speed.
Low speed is here defined as speeds
below 6% of the Nominal Speed of
Motor (1-25 Motor Nominal Speed) in
plus
VVC PM Control
Function:
Suitable for all applications where the motor
is known to be standing still when starting
(e.g. conveyors, pumps and non wind milling
fans).
If the motor turns at a slight speed (i.e. lower
than 2-5% of the nominal speed) e.g. due to
fans with light wind milling, select [1] Parking
and adjust 2-06 Parking Current and
2-07 Parking Time accordingly.
Function:
Stop is active in the delay period.
Enter the time delay required before
commencing acceleration.
MG20O602 - VLT
®
VLT AQUA Drive Programming Guide
1-72 Start Function
Option:
[0] DC Hold/
Motor
Preheat
[2] Coast
*
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
®
is a registered Danfoss trademark
Function:
Select the start function during start delay.
This parameter is linked to 1-71 Start Delay.
Energizes motor with a DC holding current
(2-00 DC Hold/Preheat Current) during the start
delay time.
Motor coasted during the start delay time
(inverter off).
Available selections depend on 1-10 Motor
Construction:
[0] Asynchron:
[2] coast
[0] DC-hold
[1] PM non salient:
[2] coast
Function:
This function makes it possible to catch a motor
which is spinning freely due to a mains drop-out.
When 1-73 Flying Start is enabled, 1-71 Start Delay
has no function.
Search direction for flying start is linked to the
setting in 4-10 Motor Speed Direction.
[0] Clockwise: Flying start search in clockwise
direction. If not successful, a DC brake is carried
out.
[2] Both Directions: The flying start will first make a
search in the direction determined by the last
reference (direction). If not finding the speed it
will make a search in the other direction. If not
successful, a DC brake will be activated in the
time set in 2-02 DC Braking Time. Start will then
take place from 0 Hz.
converter 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:
•
1-58 Flystart Test Pulses Current
•
1-59 Flystart Test Pulses Frequency
•
1-70 PM Start Mode
•
2-06 Parking Current
•
2-07 Parking Time
•
2-03 DC Brake Cut In Speed [RPM]
•
2-04 DC Brake Cut In Speed [Hz]
•
2-06 Parking Current