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Op-
tion
Name
Description
tions.
[4] Start speed/current
in reference direction is particularly used in applications with counterweight
and horizontal movement.
[6]
Hoist mech.
brake rel
For utilizing mechanical brake control functions (
parameter 2-24 Stop Delay
to
parameter 2-28 Gain Boost
Factor
). This parameter is only active in flux control principle, in a mode with motor feedback or sensor-
less mode.
[7]
VVC
+
/flux
counter-cw
Same function as in
[5] VVC+/flux clockwise
but running in the opposite direction.
Flying start function
When flying start is enabled,
parameter 1-71 Start Delay
and
parameter 1-72 Start Function
have no function. When options
[1] Enable
and
[2] Enabled always
are enabled,
parameter 1-58 Flying Start Test Pulses Current
and
parameter 1-59 Flying Start Test Pulses Frequen-
cy
are used to specify conditions for flying start. For flying start version 1, options
[3] Enabled ref. dir.
and
[4] Enab. always ref. dir.
are
set to search for the motor in the reference direction only, which allows a faster execution of the motor catch. For flying start version
2, options
[11]
to
[14]
are specific to asynchronous motor (induction motor) in VVC+ up to 132 Hz output frequency. These options
provide a faster, more reliable, and robust flying start. When
parameter 1-73 Flying Start
is enabled,
parameter 1-71 Start Delay
has no
function.
Parameter 1-73 Flying Start
Table 124: Parameter 1-73 Flying Start
1-73 Flying Start
Default value: [0] Disabled
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: False
N O T I C E
This function is not recommended for hoisting applications. For power levels above 55 kW, flux mode must be used to achieve
the best performance.
N O T I C E
To obtain the best flying start performance, the advanced motor data,
parameter 1-30 Stator Resistance (Rs)
to
parameter 1-35
Main Reactance (Xh)
, must be correct.
This function makes it possible to catch a freely spinning motor, for example coasted because of mains dropout. When
parameter
1-73 Flying Start
is enabled,
parameter 1-71 Start Delay
has no function. Search direction for flying start is linked to the setting in
parameter 4-10 Motor Speed Direction
.
[0] Clockwise
: Flying start searches in clockwise direction. If not successful, a DC brake is car-
ried out.
[2] Both Directions
: The flying start first searches in the direction determined by the last reference (direction). If the speed is
not found, flying start searches in the other direction. If not successful, a DC brake activates in the time set in
parameter 2-02 DC
Braking Time
. Start then takes place from 0 Hz.
Option
Name
Description
[0]*
Disabled
No function.
[1]
Enabled
Enable after coast.
[2]
Enabled always
Enable at every start.
[3]
Enabled ref. dir.
Enable after coast, search in reference direction only.
[4]
Enab. always ref. dir.
Enable at every start, search in reference direction only.
[11]
v2 Enabled
Enable flying start version 2, after coast.
AU275636650261en-000101 / 130R0334 | 97
Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide