Danfoss VLT AutomationDrive FC 300 Programming Manual page 48

Parameter Descriptions
1-72 Start Function
Option:
[3] Start speed
cw
3 3
[4] Horizontal
operation
[5] VVC+/Flux
clockwise
[6] Hoist Mech.
Brake Rel
[7] VVC+/Flux
counter-cw
1-73 Flying Start
Option:
46
VLT
Function:
Only possible with VVC plus .
Connect the function described in 1-74 Start
Speed [RPM] and 1-76 Start Current in the start
delay time.
Regardless of the value applied by the
reference signal, the output speed applies the
setting of the start speed in 1-74 Start Speed
[RPM] or 1-75 Start Speed [Hz] and the output
current corresponds to the setting of the start
current in 1-76 Start Current. This function is
typically used in hoisting applications without
counterweight and especially in applications
with a Cone-motor, where the start is
clockwise, followed by rotation in the
reference direction.
Only possible with VVC plus .
For obtaining the function described in
1-74 Start Speed [RPM] and 1-76 Start Current
during the start delay time. The motor rotates
in the reference direction. If the reference
signal equals zero (0), 1-74 Start Speed [RPM] is
ignored and the output speed equals zero (0).
The output current corresponds to the setting
of the start current in 1-76 Start Current.
For the function described in 1-74 Start Speed
[RPM] only. The start current is calculated
automatically. This function uses the start
speed in the start delay time only. Regardless
of the value set by the reference signal, the
output speed equals the setting of the start
speed in 1-74 Start Speed [RPM]. [3] Start
speed/current clockwise and [5] VVC
clockwise are typically used in hoisting
applications. [4] Start speed/current in reference
direction is particularly used in applications
with counterweight and horizontal movement.
For utilizing mechanical brake control
functions, 2-24 Stop Delay to 2-28 Gain Boost
Factor. This parameter is only active when
1-01 Motor Control Principle is set to [3] Flux w/
motor feedback (FC 302 only).
Function:
NOTE
This parameter cannot be adjusted
while motor is running.
MG33MG02 - VLT
®
AutomationDrive Programming Guide
1-73 Flying Start
Option:
[0] Disabled
[1] Enabled
[2] Enabled Always
[3] Enabled Ref.
Dir.
[4] Enab. Always
Ref. Dir.
NOTE
This function is not recommended for hoisting
applications.
For power levels above 55 kW, flux mode must be used to
achieve the best performance.
NOTE
To obtain the best flying start performance the advanced
motor data, 1-30 Stator Resistance (Rs) through 1-35 Main
Reactance (Xh), must be correct.
1-74 Start Speed [RPM]
Range:
Size
related
*
plus /Flux
1-75 Start Speed [Hz]
Range:
Size
related
*
1-76 Start Current
Range:
0 A [ 0 -
*
par. 1-24
A]
®
is a registered Danfoss trademark
Function:
This function makes it possible to catch a
motor which is spinning freely due to a
mains drop-out.
No function
Enables the frequency converter to "catch"
and control a spinning motor.
When 1-73 Flying Start is enabled, 1-71 Start
Delay and 1-72 Start Function have no
function.
Function:
[0 - 600 Set a motor start speed. After the start
RPM] signal, the output speed leaps to set
value. Set the start function in 1-72 Start
Function to [3] Start speed cw, [4]
Horizontal operation or [5] VVC
clockwise, and set a start delay time in
1-71 Start Delay.
Function:
[ 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 to [3]
Start speed cw, [4] Horizontal operation or
[5] VVC + /Flux clockwise, and set a start
delay time in 1-71 Start Delay.
Function:
Some motors, e.g. cone rotor motors, need extra
current/starting speed to disengage the rotor. To
obtain this boost, set the required current in
+ /Flux