Danfoss VLT AQUA Drive FC 200 Programming Manual page 48

Parameter Description
1-73 Flying Start
Option: Function:
•
2-07 Parking Time
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.
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. Based on the setting of 1-70 PM Start Mode the
following will happen:
1-70 PM Start Mode = [0] Rotor Detection:
If the speed estimate comes out as greater than 0 Hz the
frequency converter will catch the motor at that speed and
resume normal operation. Otherwise, the frequency
converter will estimate the rotor position and start normal
operation from there.
1-70 PM Start Mode = [1] Parking:
If the speed estimate comes out lower than the setting in
1-59 Flystart Test Pulses Frequency then the Parking function
will be engaged (see 2-06 Parking Current and 2-07 Parking
Time). Otherwise the frequency converter will catch the
motor at that speed and resume normal operation. Refer
to description of 1-70 PM Start Mode for recommended
settings.
Current limitations of the Flystart Principle used for PM
motors:
•
The speed range is up to 100% Nominal Speed or
the field weakening speed (which ever is lowest).
•
PMSM with high back emf (>300 VLL(rms)) and
high winding inductance(>10 mH) needed more
time for reducing short circuit current to zero and
may be susceptible to error in estimation.
•
Current testing limited to a speed range up to
300 Hz. For certain units the limit is 250 Hz; all
200-240 V units up to and including 2.2 kW and
all 380-480 V units up to and including 4 kW.
•
Current testing limited to a machine power size
up to 22 kW.
•
Pred for salient pole machine (IPMSM) but not yet
verified on those types of machine.
®
VLT AQUA Drive Programming Guide
1-74 Start Speed [RPM]
Range:
Size related
1-75 Start Speed [Hz]
Range:
Size
related
1-76 Start Current
Range:
0.00 A
3.3.9 1-8* Stop Adjustments
1-80 Function at Stop
Option:
[0]
[1]
®
MG20O602 - VLT is a registered Danfoss trademark
•
For high inertia applications (i.e. where the load
inertia is more than 30 times larger than the
motor inertia) a brake resistor is recomended to
avoid over-voltage trip during high speed
engagement of the fly-start function.
Function:
[0 - 600 Set a motor start speed. After the
*
RPM] start signal, the output speed leaps to
set value. Set the start function in
1-72 Start Function and set a start
delay time in 1-71 Start Delay.
Function:
[ 0.0 - This parameter can be used for hoist
500.0 Hz] applications (cone rotor). Set a motor
*
start speed. After the start signal, the
output speed leaps to set value. Set the
start function in 1-72 Start Function and
set a start delay time in 1-71 Start Delay.
Function:
[ 0.00 - Some motors, e.g. cone rotor motors, need
*
par. 1-24 extra current/starting speed to disengage
A] the rotor. To obtain this boost, set the
required current in 1-76 Start Current. Set
1-74 Start Speed [RPM]. Set 1-72 Start
Function to [0] DC Hold/Motor Preheat, and
set a start delay time in 1-71 Start Delay.
Function:
Select the frequency converter function after a
stop command or after the speed is ramped
down to the settings in 1-81 Min Speed for
Function at Stop [RPM].
Available selections depend on 1-10 Motor
Construction:
[0] Asynchron:
[0] coast
[1] DC-hold
[1] PM non salient:
[0] coast
Coast Leaves motor in free mode.
*
DC Hold/ Energizes motor with a DC holding current
Motor (see 2-00 DC Hold/Preheat Current).
Preheat
3 3
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