Danfoss VLT AutomationDrive FC 301 Programming Manual page 48

Parameter Descriptions
1-72 Start Function
Option:
[4] Horizontal
operation
3 3
[5] VVC+/Flux
clockwise
[6] Hoist Mech.
Brake Rel
[7] VVC+/Flux
counter-cw
1-73 Flying Start
Option:
[0] Disabled
[1] Enabled
[2] Enabled
Always
[3] Enabled Ref.
Dir.
[4] Enab. Always
Ref. Dir.
46
®
VLT
Function:
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 utilising 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:
NOTICE
This parameter cannot be adjusted
while themotor is running.
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.
AutomationDrive FC 301/302 Programming Guide
NOTICE
This function is not recommended for hoisting
applications.
For power levels above 55 kW, flux mode must be
used to achieve the best performance.
NOTICE
To obtain the best flying start performance the advanced
motor data, 1-30 Stator Resistance (Rs) to 1-35 Main
Reactance (Xh), must be correct.
1-74 Start Speed [RPM]
Range:
Size
related 600
*
RPM]
plus
/Flux
1-75 Start Speed [Hz]
Range:
Size
related 500.0
*
Hz]
1-76 Start Current
Range:
0 A [ 0 -
*
par.
1-24 A]
3.3.9 1-8* Stop Adjustments
1-80 Function at Stop
Option:
MG33MH02 - Rev. 2013-09-30
Function:
[0 - 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
clockwise, and set a start delay time in
1-71 Start Delay.
Function:
[ 0 - This parameter can be used for hoist
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
1-76 Start Current. Set 1-74 Start Speed [RPM]. Set
1-72 Start Function to [3] Start speed cw or [4]
Horizontal operation, and set a start delay time in
1-71 Start Delay.
This parameter can be used for hoist applications
(cone rotor).
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].
+
/Flux